![Dave Airlie](/assets/img/avatar_default.png)
We don't want fbcon to get used on non-desktop dislays, don't pass them as enabled connectors to the fb helper setup. This prevents my HMD from getting disorted fbcon, and from affecting other displays console. v2: Change description from non-standard to non-desktop Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2645 lines
72 KiB
C
2645 lines
72 KiB
C
/*
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* Copyright (c) 2006-2009 Red Hat Inc.
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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*
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* DRM framebuffer helper functions
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*
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* Authors:
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* Dave Airlie <airlied@linux.ie>
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* Jesse Barnes <jesse.barnes@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/console.h>
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#include <linux/kernel.h>
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#include <linux/sysrq.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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#include "drm_crtc_helper_internal.h"
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static bool drm_fbdev_emulation = true;
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module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
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MODULE_PARM_DESC(fbdev_emulation,
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"Enable legacy fbdev emulation [default=true]");
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static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
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module_param(drm_fbdev_overalloc, int, 0444);
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MODULE_PARM_DESC(drm_fbdev_overalloc,
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"Overallocation of the fbdev buffer (%) [default="
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__MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
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static LIST_HEAD(kernel_fb_helper_list);
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static DEFINE_MUTEX(kernel_fb_helper_lock);
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/**
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* DOC: fbdev helpers
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*
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* The fb helper functions are useful to provide an fbdev on top of a drm kernel
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* mode setting driver. They can be used mostly independently from the crtc
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* helper functions used by many drivers to implement the kernel mode setting
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* interfaces.
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*
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* Initialization is done as a four-step process with drm_fb_helper_prepare(),
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* drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
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* drm_fb_helper_initial_config(). Drivers with fancier requirements than the
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* default behaviour can override the third step with their own code.
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* Teardown is done with drm_fb_helper_fini() after the fbdev device is
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* unregisters using drm_fb_helper_unregister_fbi().
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*
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* At runtime drivers should restore the fbdev console by calling
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* drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
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* callback. They should also notify the fb helper code from updates to the
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* output configuration by calling drm_fb_helper_hotplug_event(). For easier
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* integration with the output polling code in drm_crtc_helper.c the modeset
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* code provides a &drm_mode_config_funcs.output_poll_changed callback.
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*
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* All other functions exported by the fb helper library can be used to
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* implement the fbdev driver interface by the driver.
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*
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* It is possible, though perhaps somewhat tricky, to implement race-free
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* hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
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* helper must be called first to initialize the minimum required to make
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* hotplug detection work. Drivers also need to make sure to properly set up
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* the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
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* it is safe to enable interrupts and start processing hotplug events. At the
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* same time, drivers should initialize all modeset objects such as CRTCs,
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* encoders and connectors. To finish up the fbdev helper initialization, the
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* drm_fb_helper_init() function is called. To probe for all attached displays
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* and set up an initial configuration using the detected hardware, drivers
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* should call drm_fb_helper_single_add_all_connectors() followed by
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* drm_fb_helper_initial_config().
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*
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* If &drm_framebuffer_funcs.dirty is set, the
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* drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
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* accumulate changes and schedule &drm_fb_helper.dirty_work to run right
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* away. This worker then calls the dirty() function ensuring that it will
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* always run in process context since the fb_*() function could be running in
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* atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
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* callback it will also schedule dirty_work with the damage collected from the
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* mmap page writes.
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*/
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#define drm_fb_helper_for_each_connector(fbh, i__) \
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for (({ lockdep_assert_held(&(fbh)->lock); }), \
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i__ = 0; i__ < (fbh)->connector_count; i__++)
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static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector)
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{
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struct drm_fb_helper_connector *fb_conn;
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struct drm_fb_helper_connector **temp;
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unsigned int count;
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if (!drm_fbdev_emulation)
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return 0;
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lockdep_assert_held(&fb_helper->lock);
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count = fb_helper->connector_count + 1;
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if (count > fb_helper->connector_info_alloc_count) {
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size_t size = count * sizeof(fb_conn);
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temp = krealloc(fb_helper->connector_info, size, GFP_KERNEL);
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if (!temp)
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return -ENOMEM;
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fb_helper->connector_info_alloc_count = count;
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fb_helper->connector_info = temp;
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}
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fb_conn = kzalloc(sizeof(*fb_conn), GFP_KERNEL);
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if (!fb_conn)
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return -ENOMEM;
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drm_connector_get(connector);
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fb_conn->connector = connector;
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fb_helper->connector_info[fb_helper->connector_count++] = fb_conn;
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return 0;
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}
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int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector)
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{
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int err;
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mutex_lock(&fb_helper->lock);
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err = __drm_fb_helper_add_one_connector(fb_helper, connector);
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mutex_unlock(&fb_helper->lock);
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return err;
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}
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EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
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/**
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* drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
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* emulation helper
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* @fb_helper: fbdev initialized with drm_fb_helper_init
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*
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* This functions adds all the available connectors for use with the given
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* fb_helper. This is a separate step to allow drivers to freely assign
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* connectors to the fbdev, e.g. if some are reserved for special purposes or
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* not adequate to be used for the fbcon.
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*
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* This function is protected against concurrent connector hotadds/removals
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* using drm_fb_helper_add_one_connector() and
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* drm_fb_helper_remove_one_connector().
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*/
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int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
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{
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struct drm_device *dev = fb_helper->dev;
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struct drm_connector *connector;
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struct drm_connector_list_iter conn_iter;
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int i, ret = 0;
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if (!drm_fbdev_emulation)
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return 0;
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mutex_lock(&fb_helper->lock);
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_for_each_connector_iter(connector, &conn_iter) {
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ret = __drm_fb_helper_add_one_connector(fb_helper, connector);
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if (ret)
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goto fail;
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}
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goto out;
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fail:
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drm_fb_helper_for_each_connector(fb_helper, i) {
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struct drm_fb_helper_connector *fb_helper_connector =
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fb_helper->connector_info[i];
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drm_connector_put(fb_helper_connector->connector);
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kfree(fb_helper_connector);
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fb_helper->connector_info[i] = NULL;
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}
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fb_helper->connector_count = 0;
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out:
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drm_connector_list_iter_end(&conn_iter);
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mutex_unlock(&fb_helper->lock);
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return ret;
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}
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EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
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static int __drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector)
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{
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struct drm_fb_helper_connector *fb_helper_connector;
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int i, j;
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if (!drm_fbdev_emulation)
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return 0;
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lockdep_assert_held(&fb_helper->lock);
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drm_fb_helper_for_each_connector(fb_helper, i) {
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if (fb_helper->connector_info[i]->connector == connector)
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break;
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}
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if (i == fb_helper->connector_count)
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return -EINVAL;
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fb_helper_connector = fb_helper->connector_info[i];
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drm_connector_put(fb_helper_connector->connector);
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for (j = i + 1; j < fb_helper->connector_count; j++)
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fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
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fb_helper->connector_count--;
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kfree(fb_helper_connector);
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return 0;
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}
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int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector)
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{
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int err;
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mutex_lock(&fb_helper->lock);
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err = __drm_fb_helper_remove_one_connector(fb_helper, connector);
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mutex_unlock(&fb_helper->lock);
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return err;
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}
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EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
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static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
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{
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uint16_t *r_base, *g_base, *b_base;
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if (crtc->funcs->gamma_set == NULL)
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return;
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r_base = crtc->gamma_store;
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g_base = r_base + crtc->gamma_size;
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b_base = g_base + crtc->gamma_size;
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crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
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crtc->gamma_size, NULL);
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}
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/**
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* drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
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* @info: fbdev registered by the helper
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*/
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int drm_fb_helper_debug_enter(struct fb_info *info)
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{
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struct drm_fb_helper *helper = info->par;
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const struct drm_crtc_helper_funcs *funcs;
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int i;
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list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
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for (i = 0; i < helper->crtc_count; i++) {
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struct drm_mode_set *mode_set =
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&helper->crtc_info[i].mode_set;
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if (!mode_set->crtc->enabled)
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continue;
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funcs = mode_set->crtc->helper_private;
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if (funcs->mode_set_base_atomic == NULL)
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continue;
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if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
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continue;
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funcs->mode_set_base_atomic(mode_set->crtc,
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mode_set->fb,
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mode_set->x,
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mode_set->y,
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ENTER_ATOMIC_MODE_SET);
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_fb_helper_debug_enter);
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/**
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* drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
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* @info: fbdev registered by the helper
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*/
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int drm_fb_helper_debug_leave(struct fb_info *info)
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{
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struct drm_fb_helper *helper = info->par;
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struct drm_crtc *crtc;
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const struct drm_crtc_helper_funcs *funcs;
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struct drm_framebuffer *fb;
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int i;
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for (i = 0; i < helper->crtc_count; i++) {
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struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
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crtc = mode_set->crtc;
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if (drm_drv_uses_atomic_modeset(crtc->dev))
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continue;
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funcs = crtc->helper_private;
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fb = crtc->primary->fb;
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if (!crtc->enabled)
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continue;
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if (!fb) {
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DRM_ERROR("no fb to restore??\n");
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continue;
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}
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if (funcs->mode_set_base_atomic == NULL)
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continue;
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drm_fb_helper_restore_lut_atomic(mode_set->crtc);
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funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
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crtc->y, LEAVE_ATOMIC_MODE_SET);
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_fb_helper_debug_leave);
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static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool active)
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{
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struct drm_device *dev = fb_helper->dev;
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struct drm_plane *plane;
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struct drm_atomic_state *state;
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int i, ret;
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unsigned int plane_mask;
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struct drm_modeset_acquire_ctx ctx;
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drm_modeset_acquire_init(&ctx, 0);
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state = drm_atomic_state_alloc(dev);
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if (!state) {
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ret = -ENOMEM;
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goto out_ctx;
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}
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state->acquire_ctx = &ctx;
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retry:
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plane_mask = 0;
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drm_for_each_plane(plane, dev) {
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struct drm_plane_state *plane_state;
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plane_state = drm_atomic_get_plane_state(state, plane);
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if (IS_ERR(plane_state)) {
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ret = PTR_ERR(plane_state);
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goto out_state;
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}
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plane_state->rotation = DRM_MODE_ROTATE_0;
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plane->old_fb = plane->fb;
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plane_mask |= 1 << drm_plane_index(plane);
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/* disable non-primary: */
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if (plane->type == DRM_PLANE_TYPE_PRIMARY)
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continue;
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ret = __drm_atomic_helper_disable_plane(plane, plane_state);
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if (ret != 0)
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goto out_state;
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}
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for (i = 0; i < fb_helper->crtc_count; i++) {
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struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
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ret = __drm_atomic_helper_set_config(mode_set, state);
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if (ret != 0)
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goto out_state;
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/*
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* __drm_atomic_helper_set_config() sets active when a
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* mode is set, unconditionally clear it if we force DPMS off
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*/
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if (!active) {
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struct drm_crtc *crtc = mode_set->crtc;
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struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
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crtc_state->active = false;
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}
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}
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ret = drm_atomic_commit(state);
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out_state:
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drm_atomic_clean_old_fb(dev, plane_mask, ret);
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if (ret == -EDEADLK)
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goto backoff;
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drm_atomic_state_put(state);
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out_ctx:
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drm_modeset_drop_locks(&ctx);
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drm_modeset_acquire_fini(&ctx);
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return ret;
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backoff:
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drm_atomic_state_clear(state);
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drm_modeset_backoff(&ctx);
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goto retry;
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}
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static int restore_fbdev_mode_legacy(struct drm_fb_helper *fb_helper)
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{
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struct drm_device *dev = fb_helper->dev;
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struct drm_plane *plane;
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int i, ret = 0;
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drm_modeset_lock_all(fb_helper->dev);
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drm_for_each_plane(plane, dev) {
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if (plane->type != DRM_PLANE_TYPE_PRIMARY)
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drm_plane_force_disable(plane);
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if (plane->rotation_property)
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drm_mode_plane_set_obj_prop(plane,
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plane->rotation_property,
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DRM_MODE_ROTATE_0);
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}
|
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for (i = 0; i < fb_helper->crtc_count; i++) {
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struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
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struct drm_crtc *crtc = mode_set->crtc;
|
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|
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if (crtc->funcs->cursor_set2) {
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ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
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if (ret)
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goto out;
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} else if (crtc->funcs->cursor_set) {
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ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
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if (ret)
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goto out;
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}
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ret = drm_mode_set_config_internal(mode_set);
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if (ret)
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goto out;
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}
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out:
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drm_modeset_unlock_all(fb_helper->dev);
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return ret;
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}
|
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|
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static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
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{
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struct drm_device *dev = fb_helper->dev;
|
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|
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if (drm_drv_uses_atomic_modeset(dev))
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return restore_fbdev_mode_atomic(fb_helper, true);
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else
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return restore_fbdev_mode_legacy(fb_helper);
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}
|
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|
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/**
|
|
* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
|
|
* @fb_helper: fbcon to restore
|
|
*
|
|
* This should be called from driver's drm &drm_driver.lastclose callback
|
|
* when implementing an fbcon on top of kms using this helper. This ensures that
|
|
* the user isn't greeted with a black screen when e.g. X dies.
|
|
*
|
|
* RETURNS:
|
|
* Zero if everything went ok, negative error code otherwise.
|
|
*/
|
|
int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
|
|
{
|
|
bool do_delayed;
|
|
int ret;
|
|
|
|
if (!drm_fbdev_emulation)
|
|
return -ENODEV;
|
|
|
|
if (READ_ONCE(fb_helper->deferred_setup))
|
|
return 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
ret = restore_fbdev_mode(fb_helper);
|
|
|
|
do_delayed = fb_helper->delayed_hotplug;
|
|
if (do_delayed)
|
|
fb_helper->delayed_hotplug = false;
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
if (do_delayed)
|
|
drm_fb_helper_hotplug_event(fb_helper);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
|
|
|
|
static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
|
|
{
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct drm_crtc *crtc;
|
|
int bound = 0, crtcs_bound = 0;
|
|
|
|
/*
|
|
* Sometimes user space wants everything disabled, so don't steal the
|
|
* display if there's a master.
|
|
*/
|
|
if (READ_ONCE(dev->master))
|
|
return false;
|
|
|
|
drm_for_each_crtc(crtc, dev) {
|
|
drm_modeset_lock(&crtc->mutex, NULL);
|
|
if (crtc->primary->fb)
|
|
crtcs_bound++;
|
|
if (crtc->primary->fb == fb_helper->fb)
|
|
bound++;
|
|
drm_modeset_unlock(&crtc->mutex);
|
|
}
|
|
|
|
if (bound < crtcs_bound)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
/*
|
|
* restore fbcon display for all kms driver's using this helper, used for sysrq
|
|
* and panic handling.
|
|
*/
|
|
static bool drm_fb_helper_force_kernel_mode(void)
|
|
{
|
|
bool ret, error = false;
|
|
struct drm_fb_helper *helper;
|
|
|
|
if (list_empty(&kernel_fb_helper_list))
|
|
return false;
|
|
|
|
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
|
|
struct drm_device *dev = helper->dev;
|
|
|
|
if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
|
|
continue;
|
|
|
|
mutex_lock(&helper->lock);
|
|
ret = restore_fbdev_mode(helper);
|
|
if (ret)
|
|
error = true;
|
|
mutex_unlock(&helper->lock);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
|
|
{
|
|
bool ret;
|
|
|
|
ret = drm_fb_helper_force_kernel_mode();
|
|
if (ret == true)
|
|
DRM_ERROR("Failed to restore crtc configuration\n");
|
|
}
|
|
static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
|
|
|
|
static void drm_fb_helper_sysrq(int dummy1)
|
|
{
|
|
schedule_work(&drm_fb_helper_restore_work);
|
|
}
|
|
|
|
static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
|
|
.handler = drm_fb_helper_sysrq,
|
|
.help_msg = "force-fb(V)",
|
|
.action_msg = "Restore framebuffer console",
|
|
};
|
|
#else
|
|
static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
|
|
#endif
|
|
|
|
static void dpms_legacy(struct drm_fb_helper *fb_helper, int dpms_mode)
|
|
{
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct drm_crtc *crtc;
|
|
struct drm_connector *connector;
|
|
int i, j;
|
|
|
|
drm_modeset_lock_all(dev);
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
crtc = fb_helper->crtc_info[i].mode_set.crtc;
|
|
|
|
if (!crtc->enabled)
|
|
continue;
|
|
|
|
/* Walk the connectors & encoders on this fb turning them on/off */
|
|
drm_fb_helper_for_each_connector(fb_helper, j) {
|
|
connector = fb_helper->connector_info[j]->connector;
|
|
connector->funcs->dpms(connector, dpms_mode);
|
|
drm_object_property_set_value(&connector->base,
|
|
dev->mode_config.dpms_property, dpms_mode);
|
|
}
|
|
}
|
|
drm_modeset_unlock_all(dev);
|
|
}
|
|
|
|
static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
|
|
/*
|
|
* For each CRTC in this fb, turn the connectors on/off.
|
|
*/
|
|
mutex_lock(&fb_helper->lock);
|
|
if (!drm_fb_helper_is_bound(fb_helper)) {
|
|
mutex_unlock(&fb_helper->lock);
|
|
return;
|
|
}
|
|
|
|
if (drm_drv_uses_atomic_modeset(fb_helper->dev))
|
|
restore_fbdev_mode_atomic(fb_helper, dpms_mode == DRM_MODE_DPMS_ON);
|
|
else
|
|
dpms_legacy(fb_helper, dpms_mode);
|
|
mutex_unlock(&fb_helper->lock);
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_blank - implementation for &fb_ops.fb_blank
|
|
* @blank: desired blanking state
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_blank(int blank, struct fb_info *info)
|
|
{
|
|
if (oops_in_progress)
|
|
return -EBUSY;
|
|
|
|
switch (blank) {
|
|
/* Display: On; HSync: On, VSync: On */
|
|
case FB_BLANK_UNBLANK:
|
|
drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
|
|
break;
|
|
/* Display: Off; HSync: On, VSync: On */
|
|
case FB_BLANK_NORMAL:
|
|
drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
|
|
break;
|
|
/* Display: Off; HSync: Off, VSync: On */
|
|
case FB_BLANK_HSYNC_SUSPEND:
|
|
drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
|
|
break;
|
|
/* Display: Off; HSync: On, VSync: Off */
|
|
case FB_BLANK_VSYNC_SUSPEND:
|
|
drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
|
|
break;
|
|
/* Display: Off; HSync: Off, VSync: Off */
|
|
case FB_BLANK_POWERDOWN:
|
|
drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_blank);
|
|
|
|
static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper,
|
|
struct drm_mode_set *modeset)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < modeset->num_connectors; i++) {
|
|
drm_connector_put(modeset->connectors[i]);
|
|
modeset->connectors[i] = NULL;
|
|
}
|
|
modeset->num_connectors = 0;
|
|
|
|
drm_mode_destroy(helper->dev, modeset->mode);
|
|
modeset->mode = NULL;
|
|
|
|
/* FIXME should hold a ref? */
|
|
modeset->fb = NULL;
|
|
}
|
|
|
|
static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < helper->connector_count; i++) {
|
|
drm_connector_put(helper->connector_info[i]->connector);
|
|
kfree(helper->connector_info[i]);
|
|
}
|
|
kfree(helper->connector_info);
|
|
|
|
for (i = 0; i < helper->crtc_count; i++) {
|
|
struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set;
|
|
|
|
drm_fb_helper_modeset_release(helper, modeset);
|
|
kfree(modeset->connectors);
|
|
}
|
|
kfree(helper->crtc_info);
|
|
}
|
|
|
|
static void drm_fb_helper_resume_worker(struct work_struct *work)
|
|
{
|
|
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
|
|
resume_work);
|
|
|
|
console_lock();
|
|
fb_set_suspend(helper->fbdev, 0);
|
|
console_unlock();
|
|
}
|
|
|
|
static void drm_fb_helper_dirty_work(struct work_struct *work)
|
|
{
|
|
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
|
|
dirty_work);
|
|
struct drm_clip_rect *clip = &helper->dirty_clip;
|
|
struct drm_clip_rect clip_copy;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&helper->dirty_lock, flags);
|
|
clip_copy = *clip;
|
|
clip->x1 = clip->y1 = ~0;
|
|
clip->x2 = clip->y2 = 0;
|
|
spin_unlock_irqrestore(&helper->dirty_lock, flags);
|
|
|
|
/* call dirty callback only when it has been really touched */
|
|
if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2)
|
|
helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_prepare - setup a drm_fb_helper structure
|
|
* @dev: DRM device
|
|
* @helper: driver-allocated fbdev helper structure to set up
|
|
* @funcs: pointer to structure of functions associate with this helper
|
|
*
|
|
* Sets up the bare minimum to make the framebuffer helper usable. This is
|
|
* useful to implement race-free initialization of the polling helpers.
|
|
*/
|
|
void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
|
|
const struct drm_fb_helper_funcs *funcs)
|
|
{
|
|
INIT_LIST_HEAD(&helper->kernel_fb_list);
|
|
spin_lock_init(&helper->dirty_lock);
|
|
INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
|
|
INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
|
|
helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
|
|
mutex_init(&helper->lock);
|
|
helper->funcs = funcs;
|
|
helper->dev = dev;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_prepare);
|
|
|
|
/**
|
|
* drm_fb_helper_init - initialize a &struct drm_fb_helper
|
|
* @dev: drm device
|
|
* @fb_helper: driver-allocated fbdev helper structure to initialize
|
|
* @max_conn_count: max connector count
|
|
*
|
|
* This allocates the structures for the fbdev helper with the given limits.
|
|
* Note that this won't yet touch the hardware (through the driver interfaces)
|
|
* nor register the fbdev. This is only done in drm_fb_helper_initial_config()
|
|
* to allow driver writes more control over the exact init sequence.
|
|
*
|
|
* Drivers must call drm_fb_helper_prepare() before calling this function.
|
|
*
|
|
* RETURNS:
|
|
* Zero if everything went ok, nonzero otherwise.
|
|
*/
|
|
int drm_fb_helper_init(struct drm_device *dev,
|
|
struct drm_fb_helper *fb_helper,
|
|
int max_conn_count)
|
|
{
|
|
struct drm_crtc *crtc;
|
|
struct drm_mode_config *config = &dev->mode_config;
|
|
int i;
|
|
|
|
if (!drm_fbdev_emulation)
|
|
return 0;
|
|
|
|
if (!max_conn_count)
|
|
return -EINVAL;
|
|
|
|
fb_helper->crtc_info = kcalloc(config->num_crtc, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
|
|
if (!fb_helper->crtc_info)
|
|
return -ENOMEM;
|
|
|
|
fb_helper->crtc_count = config->num_crtc;
|
|
fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
|
|
if (!fb_helper->connector_info) {
|
|
kfree(fb_helper->crtc_info);
|
|
return -ENOMEM;
|
|
}
|
|
fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
|
|
fb_helper->connector_count = 0;
|
|
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
fb_helper->crtc_info[i].mode_set.connectors =
|
|
kcalloc(max_conn_count,
|
|
sizeof(struct drm_connector *),
|
|
GFP_KERNEL);
|
|
|
|
if (!fb_helper->crtc_info[i].mode_set.connectors)
|
|
goto out_free;
|
|
fb_helper->crtc_info[i].mode_set.num_connectors = 0;
|
|
}
|
|
|
|
i = 0;
|
|
drm_for_each_crtc(crtc, dev) {
|
|
fb_helper->crtc_info[i].mode_set.crtc = crtc;
|
|
i++;
|
|
}
|
|
|
|
return 0;
|
|
out_free:
|
|
drm_fb_helper_crtc_free(fb_helper);
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_init);
|
|
|
|
/**
|
|
* drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
*
|
|
* A helper to alloc fb_info and the members cmap and apertures. Called
|
|
* by the driver within the fb_probe fb_helper callback function. Drivers do not
|
|
* need to release the allocated fb_info structure themselves, this is
|
|
* automatically done when calling drm_fb_helper_fini().
|
|
*
|
|
* RETURNS:
|
|
* fb_info pointer if things went okay, pointer containing error code
|
|
* otherwise
|
|
*/
|
|
struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
|
|
{
|
|
struct device *dev = fb_helper->dev->dev;
|
|
struct fb_info *info;
|
|
int ret;
|
|
|
|
info = framebuffer_alloc(0, dev);
|
|
if (!info)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = fb_alloc_cmap(&info->cmap, 256, 0);
|
|
if (ret)
|
|
goto err_release;
|
|
|
|
info->apertures = alloc_apertures(1);
|
|
if (!info->apertures) {
|
|
ret = -ENOMEM;
|
|
goto err_free_cmap;
|
|
}
|
|
|
|
fb_helper->fbdev = info;
|
|
|
|
return info;
|
|
|
|
err_free_cmap:
|
|
fb_dealloc_cmap(&info->cmap);
|
|
err_release:
|
|
framebuffer_release(info);
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
|
|
|
|
/**
|
|
* drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
*
|
|
* A wrapper around unregister_framebuffer, to release the fb_info
|
|
* framebuffer device. This must be called before releasing all resources for
|
|
* @fb_helper by calling drm_fb_helper_fini().
|
|
*/
|
|
void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
|
|
{
|
|
if (fb_helper && fb_helper->fbdev)
|
|
unregister_framebuffer(fb_helper->fbdev);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
|
|
|
|
/**
|
|
* drm_fb_helper_fini - finialize a &struct drm_fb_helper
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
*
|
|
* This cleans up all remaining resources associated with @fb_helper. Must be
|
|
* called after drm_fb_helper_unlink_fbi() was called.
|
|
*/
|
|
void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
|
|
{
|
|
struct fb_info *info;
|
|
|
|
if (!drm_fbdev_emulation || !fb_helper)
|
|
return;
|
|
|
|
cancel_work_sync(&fb_helper->resume_work);
|
|
cancel_work_sync(&fb_helper->dirty_work);
|
|
|
|
info = fb_helper->fbdev;
|
|
if (info) {
|
|
if (info->cmap.len)
|
|
fb_dealloc_cmap(&info->cmap);
|
|
framebuffer_release(info);
|
|
}
|
|
fb_helper->fbdev = NULL;
|
|
|
|
mutex_lock(&kernel_fb_helper_lock);
|
|
if (!list_empty(&fb_helper->kernel_fb_list)) {
|
|
list_del(&fb_helper->kernel_fb_list);
|
|
if (list_empty(&kernel_fb_helper_list))
|
|
unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
|
|
}
|
|
mutex_unlock(&kernel_fb_helper_lock);
|
|
|
|
mutex_destroy(&fb_helper->lock);
|
|
drm_fb_helper_crtc_free(fb_helper);
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_fini);
|
|
|
|
/**
|
|
* drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
*
|
|
* A wrapper around unlink_framebuffer implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
|
|
{
|
|
if (fb_helper && fb_helper->fbdev)
|
|
unlink_framebuffer(fb_helper->fbdev);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
|
|
|
|
static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
|
|
u32 width, u32 height)
|
|
{
|
|
struct drm_fb_helper *helper = info->par;
|
|
struct drm_clip_rect *clip = &helper->dirty_clip;
|
|
unsigned long flags;
|
|
|
|
if (!helper->fb->funcs->dirty)
|
|
return;
|
|
|
|
spin_lock_irqsave(&helper->dirty_lock, flags);
|
|
clip->x1 = min_t(u32, clip->x1, x);
|
|
clip->y1 = min_t(u32, clip->y1, y);
|
|
clip->x2 = max_t(u32, clip->x2, x + width);
|
|
clip->y2 = max_t(u32, clip->y2, y + height);
|
|
spin_unlock_irqrestore(&helper->dirty_lock, flags);
|
|
|
|
schedule_work(&helper->dirty_work);
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_deferred_io() - fbdev deferred_io callback function
|
|
* @info: fb_info struct pointer
|
|
* @pagelist: list of dirty mmap framebuffer pages
|
|
*
|
|
* This function is used as the &fb_deferred_io.deferred_io
|
|
* callback function for flushing the fbdev mmap writes.
|
|
*/
|
|
void drm_fb_helper_deferred_io(struct fb_info *info,
|
|
struct list_head *pagelist)
|
|
{
|
|
unsigned long start, end, min, max;
|
|
struct page *page;
|
|
u32 y1, y2;
|
|
|
|
min = ULONG_MAX;
|
|
max = 0;
|
|
list_for_each_entry(page, pagelist, lru) {
|
|
start = page->index << PAGE_SHIFT;
|
|
end = start + PAGE_SIZE - 1;
|
|
min = min(min, start);
|
|
max = max(max, end);
|
|
}
|
|
|
|
if (min < max) {
|
|
y1 = min / info->fix.line_length;
|
|
y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
|
|
info->var.yres);
|
|
drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_deferred_io);
|
|
|
|
/**
|
|
* drm_fb_helper_sys_read - wrapper around fb_sys_read
|
|
* @info: fb_info struct pointer
|
|
* @buf: userspace buffer to read from framebuffer memory
|
|
* @count: number of bytes to read from framebuffer memory
|
|
* @ppos: read offset within framebuffer memory
|
|
*
|
|
* A wrapper around fb_sys_read implemented by fbdev core
|
|
*/
|
|
ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return fb_sys_read(info, buf, count, ppos);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_sys_read);
|
|
|
|
/**
|
|
* drm_fb_helper_sys_write - wrapper around fb_sys_write
|
|
* @info: fb_info struct pointer
|
|
* @buf: userspace buffer to write to framebuffer memory
|
|
* @count: number of bytes to write to framebuffer memory
|
|
* @ppos: write offset within framebuffer memory
|
|
*
|
|
* A wrapper around fb_sys_write implemented by fbdev core
|
|
*/
|
|
ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
ssize_t ret;
|
|
|
|
ret = fb_sys_write(info, buf, count, ppos);
|
|
if (ret > 0)
|
|
drm_fb_helper_dirty(info, 0, 0, info->var.xres,
|
|
info->var.yres);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_sys_write);
|
|
|
|
/**
|
|
* drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
|
|
* @info: fbdev registered by the helper
|
|
* @rect: info about rectangle to fill
|
|
*
|
|
* A wrapper around sys_fillrect implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_sys_fillrect(struct fb_info *info,
|
|
const struct fb_fillrect *rect)
|
|
{
|
|
sys_fillrect(info, rect);
|
|
drm_fb_helper_dirty(info, rect->dx, rect->dy,
|
|
rect->width, rect->height);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
|
|
|
|
/**
|
|
* drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
|
|
* @info: fbdev registered by the helper
|
|
* @area: info about area to copy
|
|
*
|
|
* A wrapper around sys_copyarea implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_sys_copyarea(struct fb_info *info,
|
|
const struct fb_copyarea *area)
|
|
{
|
|
sys_copyarea(info, area);
|
|
drm_fb_helper_dirty(info, area->dx, area->dy,
|
|
area->width, area->height);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
|
|
|
|
/**
|
|
* drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
|
|
* @info: fbdev registered by the helper
|
|
* @image: info about image to blit
|
|
*
|
|
* A wrapper around sys_imageblit implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_sys_imageblit(struct fb_info *info,
|
|
const struct fb_image *image)
|
|
{
|
|
sys_imageblit(info, image);
|
|
drm_fb_helper_dirty(info, image->dx, image->dy,
|
|
image->width, image->height);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
|
|
|
|
/**
|
|
* drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
|
|
* @info: fbdev registered by the helper
|
|
* @rect: info about rectangle to fill
|
|
*
|
|
* A wrapper around cfb_imageblit implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_cfb_fillrect(struct fb_info *info,
|
|
const struct fb_fillrect *rect)
|
|
{
|
|
cfb_fillrect(info, rect);
|
|
drm_fb_helper_dirty(info, rect->dx, rect->dy,
|
|
rect->width, rect->height);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
|
|
|
|
/**
|
|
* drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
|
|
* @info: fbdev registered by the helper
|
|
* @area: info about area to copy
|
|
*
|
|
* A wrapper around cfb_copyarea implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_cfb_copyarea(struct fb_info *info,
|
|
const struct fb_copyarea *area)
|
|
{
|
|
cfb_copyarea(info, area);
|
|
drm_fb_helper_dirty(info, area->dx, area->dy,
|
|
area->width, area->height);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
|
|
|
|
/**
|
|
* drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
|
|
* @info: fbdev registered by the helper
|
|
* @image: info about image to blit
|
|
*
|
|
* A wrapper around cfb_imageblit implemented by fbdev core
|
|
*/
|
|
void drm_fb_helper_cfb_imageblit(struct fb_info *info,
|
|
const struct fb_image *image)
|
|
{
|
|
cfb_imageblit(info, image);
|
|
drm_fb_helper_dirty(info, image->dx, image->dy,
|
|
image->width, image->height);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
|
|
|
|
/**
|
|
* drm_fb_helper_set_suspend - wrapper around fb_set_suspend
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
* @suspend: whether to suspend or resume
|
|
*
|
|
* A wrapper around fb_set_suspend implemented by fbdev core.
|
|
* Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
|
|
* the lock yourself
|
|
*/
|
|
void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
|
|
{
|
|
if (fb_helper && fb_helper->fbdev)
|
|
fb_set_suspend(fb_helper->fbdev, suspend);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_set_suspend);
|
|
|
|
/**
|
|
* drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
|
|
* takes the console lock
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
* @suspend: whether to suspend or resume
|
|
*
|
|
* A wrapper around fb_set_suspend() that takes the console lock. If the lock
|
|
* isn't available on resume, a worker is tasked with waiting for the lock
|
|
* to become available. The console lock can be pretty contented on resume
|
|
* due to all the printk activity.
|
|
*
|
|
* This function can be called multiple times with the same state since
|
|
* &fb_info.state is checked to see if fbdev is running or not before locking.
|
|
*
|
|
* Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
|
|
*/
|
|
void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
|
|
bool suspend)
|
|
{
|
|
if (!fb_helper || !fb_helper->fbdev)
|
|
return;
|
|
|
|
/* make sure there's no pending/ongoing resume */
|
|
flush_work(&fb_helper->resume_work);
|
|
|
|
if (suspend) {
|
|
if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
|
|
return;
|
|
|
|
console_lock();
|
|
|
|
} else {
|
|
if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
|
|
return;
|
|
|
|
if (!console_trylock()) {
|
|
schedule_work(&fb_helper->resume_work);
|
|
return;
|
|
}
|
|
}
|
|
|
|
fb_set_suspend(fb_helper->fbdev, suspend);
|
|
console_unlock();
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
|
|
|
|
static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
|
|
{
|
|
u32 *palette = (u32 *)info->pseudo_palette;
|
|
int i;
|
|
|
|
if (cmap->start + cmap->len > 16)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < cmap->len; ++i) {
|
|
u16 red = cmap->red[i];
|
|
u16 green = cmap->green[i];
|
|
u16 blue = cmap->blue[i];
|
|
u32 value;
|
|
|
|
red >>= 16 - info->var.red.length;
|
|
green >>= 16 - info->var.green.length;
|
|
blue >>= 16 - info->var.blue.length;
|
|
value = (red << info->var.red.offset) |
|
|
(green << info->var.green.offset) |
|
|
(blue << info->var.blue.offset);
|
|
if (info->var.transp.length > 0) {
|
|
u32 mask = (1 << info->var.transp.length) - 1;
|
|
|
|
mask <<= info->var.transp.offset;
|
|
value |= mask;
|
|
}
|
|
palette[cmap->start + i] = value;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_crtc *crtc;
|
|
u16 *r, *g, *b;
|
|
int i, ret = 0;
|
|
|
|
drm_modeset_lock_all(fb_helper->dev);
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
crtc = fb_helper->crtc_info[i].mode_set.crtc;
|
|
if (!crtc->funcs->gamma_set || !crtc->gamma_size)
|
|
return -EINVAL;
|
|
|
|
if (cmap->start + cmap->len > crtc->gamma_size)
|
|
return -EINVAL;
|
|
|
|
r = crtc->gamma_store;
|
|
g = r + crtc->gamma_size;
|
|
b = g + crtc->gamma_size;
|
|
|
|
memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
|
|
memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
|
|
memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
|
|
|
|
ret = crtc->funcs->gamma_set(crtc, r, g, b,
|
|
crtc->gamma_size, NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
drm_modeset_unlock_all(fb_helper->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
|
|
struct fb_cmap *cmap)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
struct drm_property_blob *gamma_lut;
|
|
struct drm_color_lut *lut;
|
|
int size = crtc->gamma_size;
|
|
int i;
|
|
|
|
if (!size || cmap->start + cmap->len > size)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
|
|
if (IS_ERR(gamma_lut))
|
|
return gamma_lut;
|
|
|
|
lut = (struct drm_color_lut *)gamma_lut->data;
|
|
if (cmap->start || cmap->len != size) {
|
|
u16 *r = crtc->gamma_store;
|
|
u16 *g = r + crtc->gamma_size;
|
|
u16 *b = g + crtc->gamma_size;
|
|
|
|
for (i = 0; i < cmap->start; i++) {
|
|
lut[i].red = r[i];
|
|
lut[i].green = g[i];
|
|
lut[i].blue = b[i];
|
|
}
|
|
for (i = cmap->start + cmap->len; i < size; i++) {
|
|
lut[i].red = r[i];
|
|
lut[i].green = g[i];
|
|
lut[i].blue = b[i];
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < cmap->len; i++) {
|
|
lut[cmap->start + i].red = cmap->red[i];
|
|
lut[cmap->start + i].green = cmap->green[i];
|
|
lut[cmap->start + i].blue = cmap->blue[i];
|
|
}
|
|
|
|
return gamma_lut;
|
|
}
|
|
|
|
static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct drm_property_blob *gamma_lut = NULL;
|
|
struct drm_modeset_acquire_ctx ctx;
|
|
struct drm_crtc_state *crtc_state;
|
|
struct drm_atomic_state *state;
|
|
struct drm_crtc *crtc;
|
|
u16 *r, *g, *b;
|
|
int i, ret = 0;
|
|
bool replaced;
|
|
|
|
drm_modeset_acquire_init(&ctx, 0);
|
|
|
|
state = drm_atomic_state_alloc(dev);
|
|
if (!state) {
|
|
ret = -ENOMEM;
|
|
goto out_ctx;
|
|
}
|
|
|
|
state->acquire_ctx = &ctx;
|
|
retry:
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
crtc = fb_helper->crtc_info[i].mode_set.crtc;
|
|
|
|
if (!gamma_lut)
|
|
gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
|
|
if (IS_ERR(gamma_lut)) {
|
|
ret = PTR_ERR(gamma_lut);
|
|
gamma_lut = NULL;
|
|
goto out_state;
|
|
}
|
|
|
|
crtc_state = drm_atomic_get_crtc_state(state, crtc);
|
|
if (IS_ERR(crtc_state)) {
|
|
ret = PTR_ERR(crtc_state);
|
|
goto out_state;
|
|
}
|
|
|
|
replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
|
|
NULL);
|
|
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
|
|
replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
|
|
gamma_lut);
|
|
crtc_state->color_mgmt_changed |= replaced;
|
|
}
|
|
|
|
ret = drm_atomic_commit(state);
|
|
if (ret)
|
|
goto out_state;
|
|
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
crtc = fb_helper->crtc_info[i].mode_set.crtc;
|
|
|
|
r = crtc->gamma_store;
|
|
g = r + crtc->gamma_size;
|
|
b = g + crtc->gamma_size;
|
|
|
|
memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
|
|
memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
|
|
memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
|
|
}
|
|
|
|
out_state:
|
|
if (ret == -EDEADLK)
|
|
goto backoff;
|
|
|
|
drm_property_blob_put(gamma_lut);
|
|
drm_atomic_state_put(state);
|
|
out_ctx:
|
|
drm_modeset_drop_locks(&ctx);
|
|
drm_modeset_acquire_fini(&ctx);
|
|
|
|
return ret;
|
|
|
|
backoff:
|
|
drm_atomic_state_clear(state);
|
|
drm_modeset_backoff(&ctx);
|
|
goto retry;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
|
|
* @cmap: cmap to set
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
int ret;
|
|
|
|
if (oops_in_progress)
|
|
return -EBUSY;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
|
|
if (!drm_fb_helper_is_bound(fb_helper)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (info->fix.visual == FB_VISUAL_TRUECOLOR)
|
|
ret = setcmap_pseudo_palette(cmap, info);
|
|
else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
|
|
ret = setcmap_atomic(cmap, info);
|
|
else
|
|
ret = setcmap_legacy(cmap, info);
|
|
|
|
out:
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_setcmap);
|
|
|
|
/**
|
|
* drm_fb_helper_ioctl - legacy ioctl implementation
|
|
* @info: fbdev registered by the helper
|
|
* @cmd: ioctl command
|
|
* @arg: ioctl argument
|
|
*
|
|
* A helper to implement the standard fbdev ioctl. Only
|
|
* FBIO_WAITFORVSYNC is implemented for now.
|
|
*/
|
|
int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_mode_set *mode_set;
|
|
struct drm_crtc *crtc;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
if (!drm_fb_helper_is_bound(fb_helper)) {
|
|
ret = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case FBIO_WAITFORVSYNC:
|
|
/*
|
|
* Only consider the first CRTC.
|
|
*
|
|
* This ioctl is supposed to take the CRTC number as
|
|
* an argument, but in fbdev times, what that number
|
|
* was supposed to be was quite unclear, different
|
|
* drivers were passing that argument differently
|
|
* (some by reference, some by value), and most of the
|
|
* userspace applications were just hardcoding 0 as an
|
|
* argument.
|
|
*
|
|
* The first CRTC should be the integrated panel on
|
|
* most drivers, so this is the best choice we can
|
|
* make. If we're not smart enough here, one should
|
|
* just consider switch the userspace to KMS.
|
|
*/
|
|
mode_set = &fb_helper->crtc_info[0].mode_set;
|
|
crtc = mode_set->crtc;
|
|
|
|
/*
|
|
* Only wait for a vblank event if the CRTC is
|
|
* enabled, otherwise just don't do anythintg,
|
|
* not even report an error.
|
|
*/
|
|
ret = drm_crtc_vblank_get(crtc);
|
|
if (!ret) {
|
|
drm_crtc_wait_one_vblank(crtc);
|
|
drm_crtc_vblank_put(crtc);
|
|
}
|
|
|
|
ret = 0;
|
|
goto unlock;
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
unlock:
|
|
mutex_unlock(&fb_helper->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_ioctl);
|
|
|
|
/**
|
|
* drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
|
|
* @var: screeninfo to check
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_framebuffer *fb = fb_helper->fb;
|
|
int depth;
|
|
|
|
if (var->pixclock != 0 || in_dbg_master())
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Changes struct fb_var_screeninfo are currently not pushed back
|
|
* to KMS, hence fail if different settings are requested.
|
|
*/
|
|
if (var->bits_per_pixel != fb->format->cpp[0] * 8 ||
|
|
var->xres > fb->width || var->yres > fb->height ||
|
|
var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
|
|
DRM_DEBUG("fb requested width/height/bpp can't fit in current fb "
|
|
"request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
|
|
var->xres, var->yres, var->bits_per_pixel,
|
|
var->xres_virtual, var->yres_virtual,
|
|
fb->width, fb->height, fb->format->cpp[0] * 8);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (var->bits_per_pixel) {
|
|
case 16:
|
|
depth = (var->green.length == 6) ? 16 : 15;
|
|
break;
|
|
case 32:
|
|
depth = (var->transp.length > 0) ? 32 : 24;
|
|
break;
|
|
default:
|
|
depth = var->bits_per_pixel;
|
|
break;
|
|
}
|
|
|
|
switch (depth) {
|
|
case 8:
|
|
var->red.offset = 0;
|
|
var->green.offset = 0;
|
|
var->blue.offset = 0;
|
|
var->red.length = 8;
|
|
var->green.length = 8;
|
|
var->blue.length = 8;
|
|
var->transp.length = 0;
|
|
var->transp.offset = 0;
|
|
break;
|
|
case 15:
|
|
var->red.offset = 10;
|
|
var->green.offset = 5;
|
|
var->blue.offset = 0;
|
|
var->red.length = 5;
|
|
var->green.length = 5;
|
|
var->blue.length = 5;
|
|
var->transp.length = 1;
|
|
var->transp.offset = 15;
|
|
break;
|
|
case 16:
|
|
var->red.offset = 11;
|
|
var->green.offset = 5;
|
|
var->blue.offset = 0;
|
|
var->red.length = 5;
|
|
var->green.length = 6;
|
|
var->blue.length = 5;
|
|
var->transp.length = 0;
|
|
var->transp.offset = 0;
|
|
break;
|
|
case 24:
|
|
var->red.offset = 16;
|
|
var->green.offset = 8;
|
|
var->blue.offset = 0;
|
|
var->red.length = 8;
|
|
var->green.length = 8;
|
|
var->blue.length = 8;
|
|
var->transp.length = 0;
|
|
var->transp.offset = 0;
|
|
break;
|
|
case 32:
|
|
var->red.offset = 16;
|
|
var->green.offset = 8;
|
|
var->blue.offset = 0;
|
|
var->red.length = 8;
|
|
var->green.length = 8;
|
|
var->blue.length = 8;
|
|
var->transp.length = 8;
|
|
var->transp.offset = 24;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_check_var);
|
|
|
|
/**
|
|
* drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
|
|
* @info: fbdev registered by the helper
|
|
*
|
|
* This will let fbcon do the mode init and is called at initialization time by
|
|
* the fbdev core when registering the driver, and later on through the hotplug
|
|
* callback.
|
|
*/
|
|
int drm_fb_helper_set_par(struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct fb_var_screeninfo *var = &info->var;
|
|
|
|
if (oops_in_progress)
|
|
return -EBUSY;
|
|
|
|
if (var->pixclock != 0) {
|
|
DRM_ERROR("PIXEL CLOCK SET\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_set_par);
|
|
|
|
static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
struct drm_mode_set *mode_set;
|
|
|
|
mode_set = &fb_helper->crtc_info[i].mode_set;
|
|
|
|
mode_set->x = x;
|
|
mode_set->y = y;
|
|
}
|
|
}
|
|
|
|
static int pan_display_atomic(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
int ret;
|
|
|
|
pan_set(fb_helper, var->xoffset, var->yoffset);
|
|
|
|
ret = restore_fbdev_mode_atomic(fb_helper, true);
|
|
if (!ret) {
|
|
info->var.xoffset = var->xoffset;
|
|
info->var.yoffset = var->yoffset;
|
|
} else
|
|
pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pan_display_legacy(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_mode_set *modeset;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
drm_modeset_lock_all(fb_helper->dev);
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
modeset = &fb_helper->crtc_info[i].mode_set;
|
|
|
|
modeset->x = var->xoffset;
|
|
modeset->y = var->yoffset;
|
|
|
|
if (modeset->num_connectors) {
|
|
ret = drm_mode_set_config_internal(modeset);
|
|
if (!ret) {
|
|
info->var.xoffset = var->xoffset;
|
|
info->var.yoffset = var->yoffset;
|
|
}
|
|
}
|
|
}
|
|
drm_modeset_unlock_all(fb_helper->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
|
|
* @var: updated screen information
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_device *dev = fb_helper->dev;
|
|
int ret;
|
|
|
|
if (oops_in_progress)
|
|
return -EBUSY;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
if (!drm_fb_helper_is_bound(fb_helper)) {
|
|
mutex_unlock(&fb_helper->lock);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (drm_drv_uses_atomic_modeset(dev))
|
|
ret = pan_display_atomic(var, info);
|
|
else
|
|
ret = pan_display_legacy(var, info);
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_pan_display);
|
|
|
|
/*
|
|
* Allocates the backing storage and sets up the fbdev info structure through
|
|
* the ->fb_probe callback.
|
|
*/
|
|
static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
|
|
int preferred_bpp)
|
|
{
|
|
int ret = 0;
|
|
int crtc_count = 0;
|
|
int i;
|
|
struct drm_fb_helper_surface_size sizes;
|
|
int gamma_size = 0;
|
|
|
|
memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
|
|
sizes.surface_depth = 24;
|
|
sizes.surface_bpp = 32;
|
|
sizes.fb_width = (u32)-1;
|
|
sizes.fb_height = (u32)-1;
|
|
|
|
/* if driver picks 8 or 16 by default use that for both depth/bpp */
|
|
if (preferred_bpp != sizes.surface_bpp)
|
|
sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
|
|
|
|
/* first up get a count of crtcs now in use and new min/maxes width/heights */
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
|
|
struct drm_cmdline_mode *cmdline_mode;
|
|
|
|
cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
|
|
|
|
if (cmdline_mode->bpp_specified) {
|
|
switch (cmdline_mode->bpp) {
|
|
case 8:
|
|
sizes.surface_depth = sizes.surface_bpp = 8;
|
|
break;
|
|
case 15:
|
|
sizes.surface_depth = 15;
|
|
sizes.surface_bpp = 16;
|
|
break;
|
|
case 16:
|
|
sizes.surface_depth = sizes.surface_bpp = 16;
|
|
break;
|
|
case 24:
|
|
sizes.surface_depth = sizes.surface_bpp = 24;
|
|
break;
|
|
case 32:
|
|
sizes.surface_depth = 24;
|
|
sizes.surface_bpp = 32;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
crtc_count = 0;
|
|
for (i = 0; i < fb_helper->crtc_count; i++) {
|
|
struct drm_display_mode *desired_mode;
|
|
struct drm_mode_set *mode_set;
|
|
int x, y, j;
|
|
/* in case of tile group, are we the last tile vert or horiz?
|
|
* If no tile group you are always the last one both vertically
|
|
* and horizontally
|
|
*/
|
|
bool lastv = true, lasth = true;
|
|
|
|
desired_mode = fb_helper->crtc_info[i].desired_mode;
|
|
mode_set = &fb_helper->crtc_info[i].mode_set;
|
|
|
|
if (!desired_mode)
|
|
continue;
|
|
|
|
crtc_count++;
|
|
|
|
x = fb_helper->crtc_info[i].x;
|
|
y = fb_helper->crtc_info[i].y;
|
|
|
|
if (gamma_size == 0)
|
|
gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
|
|
|
|
sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
|
|
sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
|
|
|
|
for (j = 0; j < mode_set->num_connectors; j++) {
|
|
struct drm_connector *connector = mode_set->connectors[j];
|
|
|
|
if (connector->has_tile) {
|
|
lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
|
|
lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
|
|
/* cloning to multiple tiles is just crazy-talk, so: */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (lasth)
|
|
sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
|
|
if (lastv)
|
|
sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
|
|
}
|
|
|
|
if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
|
|
DRM_INFO("Cannot find any crtc or sizes\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Handle our overallocation */
|
|
sizes.surface_height *= drm_fbdev_overalloc;
|
|
sizes.surface_height /= 100;
|
|
|
|
/* push down into drivers */
|
|
ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_fill_fix - initializes fixed fbdev information
|
|
* @info: fbdev registered by the helper
|
|
* @pitch: desired pitch
|
|
* @depth: desired depth
|
|
*
|
|
* Helper to fill in the fixed fbdev information useful for a non-accelerated
|
|
* fbdev emulations. Drivers which support acceleration methods which impose
|
|
* additional constraints need to set up their own limits.
|
|
*
|
|
* Drivers should call this (or their equivalent setup code) from their
|
|
* &drm_fb_helper_funcs.fb_probe callback.
|
|
*/
|
|
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
|
|
uint32_t depth)
|
|
{
|
|
info->fix.type = FB_TYPE_PACKED_PIXELS;
|
|
info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
|
|
FB_VISUAL_TRUECOLOR;
|
|
info->fix.mmio_start = 0;
|
|
info->fix.mmio_len = 0;
|
|
info->fix.type_aux = 0;
|
|
info->fix.xpanstep = 1; /* doing it in hw */
|
|
info->fix.ypanstep = 1; /* doing it in hw */
|
|
info->fix.ywrapstep = 0;
|
|
info->fix.accel = FB_ACCEL_NONE;
|
|
|
|
info->fix.line_length = pitch;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_fill_fix);
|
|
|
|
/**
|
|
* drm_fb_helper_fill_var - initalizes variable fbdev information
|
|
* @info: fbdev instance to set up
|
|
* @fb_helper: fb helper instance to use as template
|
|
* @fb_width: desired fb width
|
|
* @fb_height: desired fb height
|
|
*
|
|
* Sets up the variable fbdev metainformation from the given fb helper instance
|
|
* and the drm framebuffer allocated in &drm_fb_helper.fb.
|
|
*
|
|
* Drivers should call this (or their equivalent setup code) from their
|
|
* &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
|
|
* backing storage framebuffer.
|
|
*/
|
|
void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
|
|
uint32_t fb_width, uint32_t fb_height)
|
|
{
|
|
struct drm_framebuffer *fb = fb_helper->fb;
|
|
|
|
info->pseudo_palette = fb_helper->pseudo_palette;
|
|
info->var.xres_virtual = fb->width;
|
|
info->var.yres_virtual = fb->height;
|
|
info->var.bits_per_pixel = fb->format->cpp[0] * 8;
|
|
info->var.accel_flags = FB_ACCELF_TEXT;
|
|
info->var.xoffset = 0;
|
|
info->var.yoffset = 0;
|
|
info->var.activate = FB_ACTIVATE_NOW;
|
|
|
|
switch (fb->format->depth) {
|
|
case 8:
|
|
info->var.red.offset = 0;
|
|
info->var.green.offset = 0;
|
|
info->var.blue.offset = 0;
|
|
info->var.red.length = 8; /* 8bit DAC */
|
|
info->var.green.length = 8;
|
|
info->var.blue.length = 8;
|
|
info->var.transp.offset = 0;
|
|
info->var.transp.length = 0;
|
|
break;
|
|
case 15:
|
|
info->var.red.offset = 10;
|
|
info->var.green.offset = 5;
|
|
info->var.blue.offset = 0;
|
|
info->var.red.length = 5;
|
|
info->var.green.length = 5;
|
|
info->var.blue.length = 5;
|
|
info->var.transp.offset = 15;
|
|
info->var.transp.length = 1;
|
|
break;
|
|
case 16:
|
|
info->var.red.offset = 11;
|
|
info->var.green.offset = 5;
|
|
info->var.blue.offset = 0;
|
|
info->var.red.length = 5;
|
|
info->var.green.length = 6;
|
|
info->var.blue.length = 5;
|
|
info->var.transp.offset = 0;
|
|
break;
|
|
case 24:
|
|
info->var.red.offset = 16;
|
|
info->var.green.offset = 8;
|
|
info->var.blue.offset = 0;
|
|
info->var.red.length = 8;
|
|
info->var.green.length = 8;
|
|
info->var.blue.length = 8;
|
|
info->var.transp.offset = 0;
|
|
info->var.transp.length = 0;
|
|
break;
|
|
case 32:
|
|
info->var.red.offset = 16;
|
|
info->var.green.offset = 8;
|
|
info->var.blue.offset = 0;
|
|
info->var.red.length = 8;
|
|
info->var.green.length = 8;
|
|
info->var.blue.length = 8;
|
|
info->var.transp.offset = 24;
|
|
info->var.transp.length = 8;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
info->var.xres = fb_width;
|
|
info->var.yres = fb_height;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_fill_var);
|
|
|
|
static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
|
|
uint32_t maxX,
|
|
uint32_t maxY)
|
|
{
|
|
struct drm_connector *connector;
|
|
int i, count = 0;
|
|
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
connector = fb_helper->connector_info[i]->connector;
|
|
count += connector->funcs->fill_modes(connector, maxX, maxY);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
|
|
{
|
|
struct drm_display_mode *mode;
|
|
|
|
list_for_each_entry(mode, &fb_connector->connector->modes, head) {
|
|
if (mode->hdisplay > width ||
|
|
mode->vdisplay > height)
|
|
continue;
|
|
if (mode->type & DRM_MODE_TYPE_PREFERRED)
|
|
return mode;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(drm_has_preferred_mode);
|
|
|
|
static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
|
|
{
|
|
return fb_connector->connector->cmdline_mode.specified;
|
|
}
|
|
|
|
struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn)
|
|
{
|
|
struct drm_cmdline_mode *cmdline_mode;
|
|
struct drm_display_mode *mode;
|
|
bool prefer_non_interlace;
|
|
|
|
cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
|
|
if (cmdline_mode->specified == false)
|
|
return NULL;
|
|
|
|
/* attempt to find a matching mode in the list of modes
|
|
* we have gotten so far, if not add a CVT mode that conforms
|
|
*/
|
|
if (cmdline_mode->rb || cmdline_mode->margins)
|
|
goto create_mode;
|
|
|
|
prefer_non_interlace = !cmdline_mode->interlace;
|
|
again:
|
|
list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
|
|
/* check width/height */
|
|
if (mode->hdisplay != cmdline_mode->xres ||
|
|
mode->vdisplay != cmdline_mode->yres)
|
|
continue;
|
|
|
|
if (cmdline_mode->refresh_specified) {
|
|
if (mode->vrefresh != cmdline_mode->refresh)
|
|
continue;
|
|
}
|
|
|
|
if (cmdline_mode->interlace) {
|
|
if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
|
|
continue;
|
|
} else if (prefer_non_interlace) {
|
|
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
|
|
continue;
|
|
}
|
|
return mode;
|
|
}
|
|
|
|
if (prefer_non_interlace) {
|
|
prefer_non_interlace = false;
|
|
goto again;
|
|
}
|
|
|
|
create_mode:
|
|
mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
|
|
cmdline_mode);
|
|
list_add(&mode->head, &fb_helper_conn->connector->modes);
|
|
return mode;
|
|
}
|
|
EXPORT_SYMBOL(drm_pick_cmdline_mode);
|
|
|
|
static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
|
|
{
|
|
bool enable;
|
|
|
|
if (connector->display_info.non_desktop)
|
|
return false;
|
|
|
|
if (strict)
|
|
enable = connector->status == connector_status_connected;
|
|
else
|
|
enable = connector->status != connector_status_disconnected;
|
|
|
|
return enable;
|
|
}
|
|
|
|
static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
|
|
bool *enabled)
|
|
{
|
|
bool any_enabled = false;
|
|
struct drm_connector *connector;
|
|
int i = 0;
|
|
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
connector = fb_helper->connector_info[i]->connector;
|
|
enabled[i] = drm_connector_enabled(connector, true);
|
|
DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
|
|
connector->display_info.non_desktop ? "non desktop" : enabled[i] ? "yes" : "no");
|
|
|
|
any_enabled |= enabled[i];
|
|
}
|
|
|
|
if (any_enabled)
|
|
return;
|
|
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
connector = fb_helper->connector_info[i]->connector;
|
|
enabled[i] = drm_connector_enabled(connector, false);
|
|
}
|
|
}
|
|
|
|
static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
|
|
struct drm_display_mode **modes,
|
|
struct drm_fb_offset *offsets,
|
|
bool *enabled, int width, int height)
|
|
{
|
|
int count, i, j;
|
|
bool can_clone = false;
|
|
struct drm_fb_helper_connector *fb_helper_conn;
|
|
struct drm_display_mode *dmt_mode, *mode;
|
|
|
|
/* only contemplate cloning in the single crtc case */
|
|
if (fb_helper->crtc_count > 1)
|
|
return false;
|
|
|
|
count = 0;
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
if (enabled[i])
|
|
count++;
|
|
}
|
|
|
|
/* only contemplate cloning if more than one connector is enabled */
|
|
if (count <= 1)
|
|
return false;
|
|
|
|
/* check the command line or if nothing common pick 1024x768 */
|
|
can_clone = true;
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
if (!enabled[i])
|
|
continue;
|
|
fb_helper_conn = fb_helper->connector_info[i];
|
|
modes[i] = drm_pick_cmdline_mode(fb_helper_conn);
|
|
if (!modes[i]) {
|
|
can_clone = false;
|
|
break;
|
|
}
|
|
for (j = 0; j < i; j++) {
|
|
if (!enabled[j])
|
|
continue;
|
|
if (!drm_mode_equal(modes[j], modes[i]))
|
|
can_clone = false;
|
|
}
|
|
}
|
|
|
|
if (can_clone) {
|
|
DRM_DEBUG_KMS("can clone using command line\n");
|
|
return true;
|
|
}
|
|
|
|
/* try and find a 1024x768 mode on each connector */
|
|
can_clone = true;
|
|
dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
|
|
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
if (!enabled[i])
|
|
continue;
|
|
|
|
fb_helper_conn = fb_helper->connector_info[i];
|
|
list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
|
|
if (drm_mode_equal(mode, dmt_mode))
|
|
modes[i] = mode;
|
|
}
|
|
if (!modes[i])
|
|
can_clone = false;
|
|
}
|
|
|
|
if (can_clone) {
|
|
DRM_DEBUG_KMS("can clone using 1024x768\n");
|
|
return true;
|
|
}
|
|
DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
|
|
return false;
|
|
}
|
|
|
|
static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
|
|
struct drm_display_mode **modes,
|
|
struct drm_fb_offset *offsets,
|
|
int idx,
|
|
int h_idx, int v_idx)
|
|
{
|
|
struct drm_fb_helper_connector *fb_helper_conn;
|
|
int i;
|
|
int hoffset = 0, voffset = 0;
|
|
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
fb_helper_conn = fb_helper->connector_info[i];
|
|
if (!fb_helper_conn->connector->has_tile)
|
|
continue;
|
|
|
|
if (!modes[i] && (h_idx || v_idx)) {
|
|
DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
|
|
fb_helper_conn->connector->base.id);
|
|
continue;
|
|
}
|
|
if (fb_helper_conn->connector->tile_h_loc < h_idx)
|
|
hoffset += modes[i]->hdisplay;
|
|
|
|
if (fb_helper_conn->connector->tile_v_loc < v_idx)
|
|
voffset += modes[i]->vdisplay;
|
|
}
|
|
offsets[idx].x = hoffset;
|
|
offsets[idx].y = voffset;
|
|
DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
|
|
return 0;
|
|
}
|
|
|
|
static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
|
|
struct drm_display_mode **modes,
|
|
struct drm_fb_offset *offsets,
|
|
bool *enabled, int width, int height)
|
|
{
|
|
struct drm_fb_helper_connector *fb_helper_conn;
|
|
const u64 mask = BIT_ULL(fb_helper->connector_count) - 1;
|
|
u64 conn_configured = 0;
|
|
int tile_pass = 0;
|
|
int i;
|
|
|
|
retry:
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
fb_helper_conn = fb_helper->connector_info[i];
|
|
|
|
if (conn_configured & BIT_ULL(i))
|
|
continue;
|
|
|
|
if (enabled[i] == false) {
|
|
conn_configured |= BIT_ULL(i);
|
|
continue;
|
|
}
|
|
|
|
/* first pass over all the untiled connectors */
|
|
if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
|
|
continue;
|
|
|
|
if (tile_pass == 1) {
|
|
if (fb_helper_conn->connector->tile_h_loc != 0 ||
|
|
fb_helper_conn->connector->tile_v_loc != 0)
|
|
continue;
|
|
|
|
} else {
|
|
if (fb_helper_conn->connector->tile_h_loc != tile_pass - 1 &&
|
|
fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
|
|
/* if this tile_pass doesn't cover any of the tiles - keep going */
|
|
continue;
|
|
|
|
/*
|
|
* find the tile offsets for this pass - need to find
|
|
* all tiles left and above
|
|
*/
|
|
drm_get_tile_offsets(fb_helper, modes, offsets,
|
|
i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
|
|
}
|
|
DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
|
|
fb_helper_conn->connector->base.id);
|
|
|
|
/* got for command line mode first */
|
|
modes[i] = drm_pick_cmdline_mode(fb_helper_conn);
|
|
if (!modes[i]) {
|
|
DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
|
|
fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
|
|
modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
|
|
}
|
|
/* No preferred modes, pick one off the list */
|
|
if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
|
|
list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
|
|
break;
|
|
}
|
|
DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
|
|
"none");
|
|
conn_configured |= BIT_ULL(i);
|
|
}
|
|
|
|
if ((conn_configured & mask) != mask) {
|
|
tile_pass++;
|
|
goto retry;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
|
|
struct drm_fb_helper_crtc **best_crtcs,
|
|
struct drm_display_mode **modes,
|
|
int n, int width, int height)
|
|
{
|
|
int c, o;
|
|
struct drm_connector *connector;
|
|
const struct drm_connector_helper_funcs *connector_funcs;
|
|
struct drm_encoder *encoder;
|
|
int my_score, best_score, score;
|
|
struct drm_fb_helper_crtc **crtcs, *crtc;
|
|
struct drm_fb_helper_connector *fb_helper_conn;
|
|
|
|
if (n == fb_helper->connector_count)
|
|
return 0;
|
|
|
|
fb_helper_conn = fb_helper->connector_info[n];
|
|
connector = fb_helper_conn->connector;
|
|
|
|
best_crtcs[n] = NULL;
|
|
best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
|
|
if (modes[n] == NULL)
|
|
return best_score;
|
|
|
|
crtcs = kcalloc(fb_helper->connector_count,
|
|
sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
|
|
if (!crtcs)
|
|
return best_score;
|
|
|
|
my_score = 1;
|
|
if (connector->status == connector_status_connected)
|
|
my_score++;
|
|
if (drm_has_cmdline_mode(fb_helper_conn))
|
|
my_score++;
|
|
if (drm_has_preferred_mode(fb_helper_conn, width, height))
|
|
my_score++;
|
|
|
|
connector_funcs = connector->helper_private;
|
|
|
|
/*
|
|
* If the DRM device implements atomic hooks and ->best_encoder() is
|
|
* NULL we fallback to the default drm_atomic_helper_best_encoder()
|
|
* helper.
|
|
*/
|
|
if (drm_drv_uses_atomic_modeset(fb_helper->dev) &&
|
|
!connector_funcs->best_encoder)
|
|
encoder = drm_atomic_helper_best_encoder(connector);
|
|
else
|
|
encoder = connector_funcs->best_encoder(connector);
|
|
|
|
if (!encoder)
|
|
goto out;
|
|
|
|
/*
|
|
* select a crtc for this connector and then attempt to configure
|
|
* remaining connectors
|
|
*/
|
|
for (c = 0; c < fb_helper->crtc_count; c++) {
|
|
crtc = &fb_helper->crtc_info[c];
|
|
|
|
if ((encoder->possible_crtcs & (1 << c)) == 0)
|
|
continue;
|
|
|
|
for (o = 0; o < n; o++)
|
|
if (best_crtcs[o] == crtc)
|
|
break;
|
|
|
|
if (o < n) {
|
|
/* ignore cloning unless only a single crtc */
|
|
if (fb_helper->crtc_count > 1)
|
|
continue;
|
|
|
|
if (!drm_mode_equal(modes[o], modes[n]))
|
|
continue;
|
|
}
|
|
|
|
crtcs[n] = crtc;
|
|
memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
|
|
score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
|
|
width, height);
|
|
if (score > best_score) {
|
|
best_score = score;
|
|
memcpy(best_crtcs, crtcs,
|
|
fb_helper->connector_count *
|
|
sizeof(struct drm_fb_helper_crtc *));
|
|
}
|
|
}
|
|
out:
|
|
kfree(crtcs);
|
|
return best_score;
|
|
}
|
|
|
|
static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
|
|
u32 width, u32 height)
|
|
{
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct drm_fb_helper_crtc **crtcs;
|
|
struct drm_display_mode **modes;
|
|
struct drm_fb_offset *offsets;
|
|
bool *enabled;
|
|
int i;
|
|
|
|
DRM_DEBUG_KMS("\n");
|
|
/* prevent concurrent modification of connector_count by hotplug */
|
|
lockdep_assert_held(&fb_helper->lock);
|
|
|
|
crtcs = kcalloc(fb_helper->connector_count,
|
|
sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
|
|
modes = kcalloc(fb_helper->connector_count,
|
|
sizeof(struct drm_display_mode *), GFP_KERNEL);
|
|
offsets = kcalloc(fb_helper->connector_count,
|
|
sizeof(struct drm_fb_offset), GFP_KERNEL);
|
|
enabled = kcalloc(fb_helper->connector_count,
|
|
sizeof(bool), GFP_KERNEL);
|
|
if (!crtcs || !modes || !enabled || !offsets) {
|
|
DRM_ERROR("Memory allocation failed\n");
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&fb_helper->dev->mode_config.mutex);
|
|
if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0)
|
|
DRM_DEBUG_KMS("No connectors reported connected with modes\n");
|
|
drm_enable_connectors(fb_helper, enabled);
|
|
|
|
if (!(fb_helper->funcs->initial_config &&
|
|
fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
|
|
offsets,
|
|
enabled, width, height))) {
|
|
memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
|
|
memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
|
|
memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
|
|
|
|
if (!drm_target_cloned(fb_helper, modes, offsets,
|
|
enabled, width, height) &&
|
|
!drm_target_preferred(fb_helper, modes, offsets,
|
|
enabled, width, height))
|
|
DRM_ERROR("Unable to find initial modes\n");
|
|
|
|
DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
|
|
width, height);
|
|
|
|
drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
|
|
}
|
|
mutex_unlock(&fb_helper->dev->mode_config.mutex);
|
|
|
|
/* need to set the modesets up here for use later */
|
|
/* fill out the connector<->crtc mappings into the modesets */
|
|
for (i = 0; i < fb_helper->crtc_count; i++)
|
|
drm_fb_helper_modeset_release(fb_helper,
|
|
&fb_helper->crtc_info[i].mode_set);
|
|
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
struct drm_display_mode *mode = modes[i];
|
|
struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
|
|
struct drm_fb_offset *offset = &offsets[i];
|
|
|
|
if (mode && fb_crtc) {
|
|
struct drm_mode_set *modeset = &fb_crtc->mode_set;
|
|
struct drm_connector *connector =
|
|
fb_helper->connector_info[i]->connector;
|
|
|
|
DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
|
|
mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
|
|
|
|
fb_crtc->desired_mode = mode;
|
|
fb_crtc->x = offset->x;
|
|
fb_crtc->y = offset->y;
|
|
modeset->mode = drm_mode_duplicate(dev,
|
|
fb_crtc->desired_mode);
|
|
drm_connector_get(connector);
|
|
modeset->connectors[modeset->num_connectors++] = connector;
|
|
modeset->x = offset->x;
|
|
modeset->y = offset->y;
|
|
}
|
|
}
|
|
out:
|
|
kfree(crtcs);
|
|
kfree(modes);
|
|
kfree(offsets);
|
|
kfree(enabled);
|
|
}
|
|
|
|
/*
|
|
* This is a continuation of drm_setup_crtcs() that sets up anything related
|
|
* to the framebuffer. During initialization, drm_setup_crtcs() is called before
|
|
* the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev).
|
|
* So, any setup that touches those fields needs to be done here instead of in
|
|
* drm_setup_crtcs().
|
|
*/
|
|
static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
|
|
{
|
|
struct fb_info *info = fb_helper->fbdev;
|
|
int i;
|
|
|
|
for (i = 0; i < fb_helper->crtc_count; i++)
|
|
if (fb_helper->crtc_info[i].mode_set.num_connectors)
|
|
fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
|
|
|
|
mutex_lock(&fb_helper->dev->mode_config.mutex);
|
|
drm_fb_helper_for_each_connector(fb_helper, i) {
|
|
struct drm_connector *connector =
|
|
fb_helper->connector_info[i]->connector;
|
|
|
|
/* use first connected connector for the physical dimensions */
|
|
if (connector->status == connector_status_connected) {
|
|
info->var.width = connector->display_info.width_mm;
|
|
info->var.height = connector->display_info.height_mm;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&fb_helper->dev->mode_config.mutex);
|
|
}
|
|
|
|
/* Note: Drops fb_helper->lock before returning. */
|
|
static int
|
|
__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
|
|
int bpp_sel)
|
|
{
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct fb_info *info;
|
|
unsigned int width, height;
|
|
int ret;
|
|
|
|
width = dev->mode_config.max_width;
|
|
height = dev->mode_config.max_height;
|
|
|
|
drm_setup_crtcs(fb_helper, width, height);
|
|
ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
|
|
if (ret < 0) {
|
|
if (ret == -EAGAIN) {
|
|
fb_helper->preferred_bpp = bpp_sel;
|
|
fb_helper->deferred_setup = true;
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
return ret;
|
|
}
|
|
drm_setup_crtcs_fb(fb_helper);
|
|
|
|
fb_helper->deferred_setup = false;
|
|
|
|
info = fb_helper->fbdev;
|
|
info->var.pixclock = 0;
|
|
|
|
/* Need to drop locks to avoid recursive deadlock in
|
|
* register_framebuffer. This is ok because the only thing left to do is
|
|
* register the fbdev emulation instance in kernel_fb_helper_list. */
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
ret = register_framebuffer(info);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dev_info(dev->dev, "fb%d: %s frame buffer device\n",
|
|
info->node, info->fix.id);
|
|
|
|
mutex_lock(&kernel_fb_helper_lock);
|
|
if (list_empty(&kernel_fb_helper_list))
|
|
register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
|
|
|
|
list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
|
|
mutex_unlock(&kernel_fb_helper_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_initial_config - setup a sane initial connector configuration
|
|
* @fb_helper: fb_helper device struct
|
|
* @bpp_sel: bpp value to use for the framebuffer configuration
|
|
*
|
|
* Scans the CRTCs and connectors and tries to put together an initial setup.
|
|
* At the moment, this is a cloned configuration across all heads with
|
|
* a new framebuffer object as the backing store.
|
|
*
|
|
* Note that this also registers the fbdev and so allows userspace to call into
|
|
* the driver through the fbdev interfaces.
|
|
*
|
|
* This function will call down into the &drm_fb_helper_funcs.fb_probe callback
|
|
* to let the driver allocate and initialize the fbdev info structure and the
|
|
* drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
|
|
* drm_fb_helper_fill_fix() are provided as helpers to setup simple default
|
|
* values for the fbdev info structure.
|
|
*
|
|
* HANG DEBUGGING:
|
|
*
|
|
* When you have fbcon support built-in or already loaded, this function will do
|
|
* a full modeset to setup the fbdev console. Due to locking misdesign in the
|
|
* VT/fbdev subsystem that entire modeset sequence has to be done while holding
|
|
* console_lock. Until console_unlock is called no dmesg lines will be sent out
|
|
* to consoles, not even serial console. This means when your driver crashes,
|
|
* you will see absolutely nothing else but a system stuck in this function,
|
|
* with no further output. Any kind of printk() you place within your own driver
|
|
* or in the drm core modeset code will also never show up.
|
|
*
|
|
* Standard debug practice is to run the fbcon setup without taking the
|
|
* console_lock as a hack, to be able to see backtraces and crashes on the
|
|
* serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
|
|
* cmdline option.
|
|
*
|
|
* The other option is to just disable fbdev emulation since very likely the
|
|
* first modeset from userspace will crash in the same way, and is even easier
|
|
* to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
|
|
* kernel cmdline option.
|
|
*
|
|
* RETURNS:
|
|
* Zero if everything went ok, nonzero otherwise.
|
|
*/
|
|
int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
|
|
{
|
|
int ret;
|
|
|
|
if (!drm_fbdev_emulation)
|
|
return 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_initial_config);
|
|
|
|
/**
|
|
* drm_fb_helper_hotplug_event - respond to a hotplug notification by
|
|
* probing all the outputs attached to the fb
|
|
* @fb_helper: the drm_fb_helper
|
|
*
|
|
* Scan the connectors attached to the fb_helper and try to put together a
|
|
* setup after notification of a change in output configuration.
|
|
*
|
|
* Called at runtime, takes the mode config locks to be able to check/change the
|
|
* modeset configuration. Must be run from process context (which usually means
|
|
* either the output polling work or a work item launched from the driver's
|
|
* hotplug interrupt).
|
|
*
|
|
* Note that drivers may call this even before calling
|
|
* drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
|
|
* for a race-free fbcon setup and will make sure that the fbdev emulation will
|
|
* not miss any hotplug events.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success and a non-zero error code otherwise.
|
|
*/
|
|
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
|
|
{
|
|
int err = 0;
|
|
|
|
if (!drm_fbdev_emulation)
|
|
return 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
if (fb_helper->deferred_setup) {
|
|
err = __drm_fb_helper_initial_config_and_unlock(fb_helper,
|
|
fb_helper->preferred_bpp);
|
|
return err;
|
|
}
|
|
|
|
if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
|
|
fb_helper->delayed_hotplug = true;
|
|
mutex_unlock(&fb_helper->lock);
|
|
return err;
|
|
}
|
|
|
|
DRM_DEBUG_KMS("\n");
|
|
|
|
drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height);
|
|
drm_setup_crtcs_fb(fb_helper);
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
drm_fb_helper_set_par(fb_helper->fbdev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
|
|
|
|
/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
|
|
* but the module doesn't depend on any fb console symbols. At least
|
|
* attempt to load fbcon to avoid leaving the system without a usable console.
|
|
*/
|
|
int __init drm_fb_helper_modinit(void)
|
|
{
|
|
#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
|
|
const char name[] = "fbcon";
|
|
struct module *fbcon;
|
|
|
|
mutex_lock(&module_mutex);
|
|
fbcon = find_module(name);
|
|
mutex_unlock(&module_mutex);
|
|
|
|
if (!fbcon)
|
|
request_module_nowait(name);
|
|
#endif
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_modinit);
|