![Ilija Hadzic](/assets/img/avatar_default.png)
Bit-copying restoration of CRTC structure in failure-recovery path of drm_crtc_helper_set_config function evokes a subtle and rare, but very dangerous, corruption of CRTC mutex structure. Namely, if drm_crtc_helper_set_config takes the path under 'fail:' label *and* some other process has attempted to grab the crtc mutex (and got blocked), restoring the CRTC structure by bit-copying it will overwrite the CRTC mutex state and the waiters list pointer within the mutex structure. Consequently the blocked process will never be scheduled. This patch fixes the issue by eliminating the bit-copy restoration. The elimination is possible because previous patches have cleaned up the resoration path so that only the fields touched by the drm_crtc_helper_set_config function are saved and restored if necessary. Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
1164 lines
33 KiB
C
1164 lines
33 KiB
C
/*
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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 core CRTC related 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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* Keith Packard
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* Eric Anholt <eric@anholt.net>
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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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#include <linux/export.h>
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#include <linux/moduleparam.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_fourcc.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_edid.h>
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MODULE_AUTHOR("David Airlie, Jesse Barnes");
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MODULE_DESCRIPTION("DRM KMS helper");
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MODULE_LICENSE("GPL and additional rights");
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/**
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* drm_helper_move_panel_connectors_to_head() - move panels to the front in the
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* connector list
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* @dev: drm device to operate on
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*
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* Some userspace presumes that the first connected connector is the main
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* display, where it's supposed to display e.g. the login screen. For
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* laptops, this should be the main panel. Use this function to sort all
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* (eDP/LVDS) panels to the front of the connector list, instead of
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* painstakingly trying to initialize them in the right order.
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*/
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void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
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{
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struct drm_connector *connector, *tmp;
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struct list_head panel_list;
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INIT_LIST_HEAD(&panel_list);
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list_for_each_entry_safe(connector, tmp,
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&dev->mode_config.connector_list, head) {
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if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
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connector->connector_type == DRM_MODE_CONNECTOR_eDP)
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list_move_tail(&connector->head, &panel_list);
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}
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list_splice(&panel_list, &dev->mode_config.connector_list);
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}
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EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
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static bool drm_kms_helper_poll = true;
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module_param_named(poll, drm_kms_helper_poll, bool, 0600);
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static void drm_mode_validate_flag(struct drm_connector *connector,
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int flags)
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{
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struct drm_display_mode *mode;
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if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
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DRM_MODE_FLAG_3D_MASK))
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return;
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list_for_each_entry(mode, &connector->modes, head) {
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if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
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!(flags & DRM_MODE_FLAG_INTERLACE))
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mode->status = MODE_NO_INTERLACE;
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if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
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!(flags & DRM_MODE_FLAG_DBLSCAN))
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mode->status = MODE_NO_DBLESCAN;
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if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
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!(flags & DRM_MODE_FLAG_3D_MASK))
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mode->status = MODE_NO_STEREO;
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}
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return;
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}
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/**
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* drm_helper_probe_single_connector_modes - get complete set of display modes
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* @connector: connector to probe
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* @maxX: max width for modes
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* @maxY: max height for modes
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*
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* LOCKING:
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* Caller must hold mode config lock.
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*
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* Based on the helper callbacks implemented by @connector try to detect all
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* valid modes. Modes will first be added to the connector's probed_modes list,
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* then culled (based on validity and the @maxX, @maxY parameters) and put into
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* the normal modes list.
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*
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* Intended to be use as a generic implementation of the ->fill_modes()
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* @connector vfunc for drivers that use the crtc helpers for output mode
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* filtering and detection.
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*
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* RETURNS:
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* Number of modes found on @connector.
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*/
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int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
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uint32_t maxX, uint32_t maxY)
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{
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struct drm_device *dev = connector->dev;
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struct drm_display_mode *mode;
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struct drm_connector_helper_funcs *connector_funcs =
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connector->helper_private;
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int count = 0;
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int mode_flags = 0;
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bool verbose_prune = true;
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
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drm_get_connector_name(connector));
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/* set all modes to the unverified state */
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list_for_each_entry(mode, &connector->modes, head)
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mode->status = MODE_UNVERIFIED;
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if (connector->force) {
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if (connector->force == DRM_FORCE_ON)
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connector->status = connector_status_connected;
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else
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connector->status = connector_status_disconnected;
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if (connector->funcs->force)
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connector->funcs->force(connector);
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} else {
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connector->status = connector->funcs->detect(connector, true);
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}
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/* Re-enable polling in case the global poll config changed. */
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if (drm_kms_helper_poll != dev->mode_config.poll_running)
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drm_kms_helper_poll_enable(dev);
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dev->mode_config.poll_running = drm_kms_helper_poll;
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if (connector->status == connector_status_disconnected) {
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
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connector->base.id, drm_get_connector_name(connector));
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drm_mode_connector_update_edid_property(connector, NULL);
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verbose_prune = false;
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goto prune;
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}
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#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
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count = drm_load_edid_firmware(connector);
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if (count == 0)
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#endif
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count = (*connector_funcs->get_modes)(connector);
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if (count == 0 && connector->status == connector_status_connected)
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count = drm_add_modes_noedid(connector, 1024, 768);
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if (count == 0)
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goto prune;
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drm_mode_connector_list_update(connector);
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if (maxX && maxY)
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drm_mode_validate_size(dev, &connector->modes, maxX,
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maxY, 0);
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if (connector->interlace_allowed)
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mode_flags |= DRM_MODE_FLAG_INTERLACE;
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if (connector->doublescan_allowed)
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mode_flags |= DRM_MODE_FLAG_DBLSCAN;
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if (connector->stereo_allowed)
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mode_flags |= DRM_MODE_FLAG_3D_MASK;
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drm_mode_validate_flag(connector, mode_flags);
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list_for_each_entry(mode, &connector->modes, head) {
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if (mode->status == MODE_OK)
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mode->status = connector_funcs->mode_valid(connector,
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mode);
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}
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prune:
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drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
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if (list_empty(&connector->modes))
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return 0;
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list_for_each_entry(mode, &connector->modes, head)
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mode->vrefresh = drm_mode_vrefresh(mode);
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drm_mode_sort(&connector->modes);
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
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drm_get_connector_name(connector));
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list_for_each_entry(mode, &connector->modes, head) {
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drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
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drm_mode_debug_printmodeline(mode);
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}
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return count;
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}
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EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
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/**
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* drm_helper_encoder_in_use - check if a given encoder is in use
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* @encoder: encoder to check
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*
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* LOCKING:
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* Caller must hold mode config lock.
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*
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* Walk @encoders's DRM device's mode_config and see if it's in use.
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*
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* RETURNS:
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* True if @encoder is part of the mode_config, false otherwise.
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*/
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bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
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{
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struct drm_connector *connector;
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struct drm_device *dev = encoder->dev;
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list_for_each_entry(connector, &dev->mode_config.connector_list, head)
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if (connector->encoder == encoder)
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return true;
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return false;
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}
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EXPORT_SYMBOL(drm_helper_encoder_in_use);
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/**
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* drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
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* @crtc: CRTC to check
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*
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* LOCKING:
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* Caller must hold mode config lock.
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*
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* Walk @crtc's DRM device's mode_config and see if it's in use.
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*
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* RETURNS:
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* True if @crtc is part of the mode_config, false otherwise.
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*/
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bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
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{
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struct drm_encoder *encoder;
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struct drm_device *dev = crtc->dev;
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/* FIXME: Locking around list access? */
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list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
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if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
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return true;
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return false;
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}
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EXPORT_SYMBOL(drm_helper_crtc_in_use);
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static void
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drm_encoder_disable(struct drm_encoder *encoder)
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{
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struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
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if (encoder->bridge)
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encoder->bridge->funcs->disable(encoder->bridge);
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if (encoder_funcs->disable)
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(*encoder_funcs->disable)(encoder);
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else
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(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
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if (encoder->bridge)
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encoder->bridge->funcs->post_disable(encoder->bridge);
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}
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/**
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* drm_helper_disable_unused_functions - disable unused objects
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* @dev: DRM device
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*
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* LOCKING:
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* Caller must hold mode config lock.
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*
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* If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
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* by calling its dpms function, which should power it off.
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*/
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void drm_helper_disable_unused_functions(struct drm_device *dev)
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{
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struct drm_encoder *encoder;
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struct drm_connector *connector;
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struct drm_crtc *crtc;
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list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
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if (!connector->encoder)
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continue;
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if (connector->status == connector_status_disconnected)
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connector->encoder = NULL;
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}
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list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
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if (!drm_helper_encoder_in_use(encoder)) {
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drm_encoder_disable(encoder);
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/* disconnector encoder from any connector */
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encoder->crtc = NULL;
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}
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}
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list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
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struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
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crtc->enabled = drm_helper_crtc_in_use(crtc);
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if (!crtc->enabled) {
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if (crtc_funcs->disable)
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(*crtc_funcs->disable)(crtc);
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else
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(*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
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crtc->fb = NULL;
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}
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}
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}
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EXPORT_SYMBOL(drm_helper_disable_unused_functions);
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/**
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* drm_encoder_crtc_ok - can a given crtc drive a given encoder?
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* @encoder: encoder to test
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* @crtc: crtc to test
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*
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* Return false if @encoder can't be driven by @crtc, true otherwise.
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*/
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static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
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struct drm_crtc *crtc)
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{
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struct drm_device *dev;
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struct drm_crtc *tmp;
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int crtc_mask = 1;
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WARN(!crtc, "checking null crtc?\n");
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dev = crtc->dev;
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list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
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if (tmp == crtc)
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break;
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crtc_mask <<= 1;
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}
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if (encoder->possible_crtcs & crtc_mask)
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return true;
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return false;
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}
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/*
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* Check the CRTC we're going to map each output to vs. its current
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* CRTC. If they don't match, we have to disable the output and the CRTC
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* since the driver will have to re-route things.
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*/
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static void
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drm_crtc_prepare_encoders(struct drm_device *dev)
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{
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struct drm_encoder_helper_funcs *encoder_funcs;
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struct drm_encoder *encoder;
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list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
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encoder_funcs = encoder->helper_private;
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/* Disable unused encoders */
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if (encoder->crtc == NULL)
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drm_encoder_disable(encoder);
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/* Disable encoders whose CRTC is about to change */
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if (encoder_funcs->get_crtc &&
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encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
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drm_encoder_disable(encoder);
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}
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}
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/**
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* drm_crtc_helper_set_mode - internal helper to set a mode
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* @crtc: CRTC to program
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* @mode: mode to use
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* @x: horizontal offset into the surface
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* @y: vertical offset into the surface
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* @old_fb: old framebuffer, for cleanup
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*
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* LOCKING:
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* Caller must hold mode config lock.
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*
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* Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
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* to fixup or reject the mode prior to trying to set it. This is an internal
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* helper that drivers could e.g. use to update properties that require the
|
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* entire output pipe to be disabled and re-enabled in a new configuration. For
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* example for changing whether audio is enabled on a hdmi link or for changing
|
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* panel fitter or dither attributes. It is also called by the
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* drm_crtc_helper_set_config() helper function to drive the mode setting
|
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* sequence.
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*
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* RETURNS:
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* True if the mode was set successfully, or false otherwise.
|
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*/
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bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
|
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struct drm_display_mode *mode,
|
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int x, int y,
|
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struct drm_framebuffer *old_fb)
|
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{
|
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struct drm_device *dev = crtc->dev;
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struct drm_display_mode *adjusted_mode, saved_mode;
|
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struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
|
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struct drm_encoder_helper_funcs *encoder_funcs;
|
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int saved_x, saved_y;
|
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bool saved_enabled;
|
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struct drm_encoder *encoder;
|
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bool ret = true;
|
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|
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saved_enabled = crtc->enabled;
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crtc->enabled = drm_helper_crtc_in_use(crtc);
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if (!crtc->enabled)
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return true;
|
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|
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adjusted_mode = drm_mode_duplicate(dev, mode);
|
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if (!adjusted_mode) {
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crtc->enabled = saved_enabled;
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return false;
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}
|
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|
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saved_mode = crtc->mode;
|
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saved_x = crtc->x;
|
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saved_y = crtc->y;
|
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|
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/* Update crtc values up front so the driver can rely on them for mode
|
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* setting.
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*/
|
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crtc->mode = *mode;
|
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crtc->x = x;
|
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crtc->y = y;
|
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|
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/* Pass our mode to the connectors and the CRTC to give them a chance to
|
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* adjust it according to limitations or connector properties, and also
|
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* a chance to reject the mode entirely.
|
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*/
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list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
|
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if (encoder->crtc != crtc)
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continue;
|
|
|
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if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
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ret = encoder->bridge->funcs->mode_fixup(
|
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encoder->bridge, mode, adjusted_mode);
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if (!ret) {
|
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DRM_DEBUG_KMS("Bridge fixup failed\n");
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goto done;
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}
|
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}
|
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|
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encoder_funcs = encoder->helper_private;
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if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
|
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adjusted_mode))) {
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DRM_DEBUG_KMS("Encoder fixup failed\n");
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goto done;
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}
|
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}
|
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|
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if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
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DRM_DEBUG_KMS("CRTC fixup failed\n");
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goto done;
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}
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DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
|
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|
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/* Prepare the encoders and CRTCs before setting the mode. */
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list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
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|
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if (encoder->crtc != crtc)
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continue;
|
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|
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if (encoder->bridge)
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encoder->bridge->funcs->disable(encoder->bridge);
|
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|
|
encoder_funcs = encoder->helper_private;
|
|
/* Disable the encoders as the first thing we do. */
|
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encoder_funcs->prepare(encoder);
|
|
|
|
if (encoder->bridge)
|
|
encoder->bridge->funcs->post_disable(encoder->bridge);
|
|
}
|
|
|
|
drm_crtc_prepare_encoders(dev);
|
|
|
|
crtc_funcs->prepare(crtc);
|
|
|
|
/* Set up the DPLL and any encoders state that needs to adjust or depend
|
|
* on the DPLL.
|
|
*/
|
|
ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
|
|
if (!ret)
|
|
goto done;
|
|
|
|
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
|
|
if (encoder->crtc != crtc)
|
|
continue;
|
|
|
|
DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
|
|
encoder->base.id, drm_get_encoder_name(encoder),
|
|
mode->base.id, mode->name);
|
|
encoder_funcs = encoder->helper_private;
|
|
encoder_funcs->mode_set(encoder, mode, adjusted_mode);
|
|
|
|
if (encoder->bridge && encoder->bridge->funcs->mode_set)
|
|
encoder->bridge->funcs->mode_set(encoder->bridge, mode,
|
|
adjusted_mode);
|
|
}
|
|
|
|
/* Now enable the clocks, plane, pipe, and connectors that we set up. */
|
|
crtc_funcs->commit(crtc);
|
|
|
|
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
|
|
if (encoder->crtc != crtc)
|
|
continue;
|
|
|
|
if (encoder->bridge)
|
|
encoder->bridge->funcs->pre_enable(encoder->bridge);
|
|
|
|
encoder_funcs = encoder->helper_private;
|
|
encoder_funcs->commit(encoder);
|
|
|
|
if (encoder->bridge)
|
|
encoder->bridge->funcs->enable(encoder->bridge);
|
|
}
|
|
|
|
/* Store real post-adjustment hardware mode. */
|
|
crtc->hwmode = *adjusted_mode;
|
|
|
|
/* Calculate and store various constants which
|
|
* are later needed by vblank and swap-completion
|
|
* timestamping. They are derived from true hwmode.
|
|
*/
|
|
drm_calc_timestamping_constants(crtc);
|
|
|
|
/* FIXME: add subpixel order */
|
|
done:
|
|
drm_mode_destroy(dev, adjusted_mode);
|
|
if (!ret) {
|
|
crtc->enabled = saved_enabled;
|
|
crtc->mode = saved_mode;
|
|
crtc->x = saved_x;
|
|
crtc->y = saved_y;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_helper_set_mode);
|
|
|
|
|
|
static int
|
|
drm_crtc_helper_disable(struct drm_crtc *crtc)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
struct drm_connector *connector;
|
|
struct drm_encoder *encoder;
|
|
|
|
/* Decouple all encoders and their attached connectors from this crtc */
|
|
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
if (encoder->crtc != crtc)
|
|
continue;
|
|
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
if (connector->encoder != encoder)
|
|
continue;
|
|
|
|
connector->encoder = NULL;
|
|
|
|
/*
|
|
* drm_helper_disable_unused_functions() ought to be
|
|
* doing this, but since we've decoupled the encoder
|
|
* from the connector above, the required connection
|
|
* between them is henceforth no longer available.
|
|
*/
|
|
connector->dpms = DRM_MODE_DPMS_OFF;
|
|
}
|
|
}
|
|
|
|
drm_helper_disable_unused_functions(dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_helper_set_config - set a new config from userspace
|
|
* @set: mode set configuration
|
|
*
|
|
* LOCKING:
|
|
* Caller must hold mode config lock.
|
|
*
|
|
* Setup a new configuration, provided by the upper layers (either an ioctl call
|
|
* from userspace or internally e.g. from the fbdev suppport code) in @set, and
|
|
* enable it. This is the main helper functions for drivers that implement
|
|
* kernel mode setting with the crtc helper functions and the assorted
|
|
* ->prepare(), ->modeset() and ->commit() helper callbacks.
|
|
*
|
|
* RETURNS:
|
|
* Returns 0 on success, -ERRNO on failure.
|
|
*/
|
|
int drm_crtc_helper_set_config(struct drm_mode_set *set)
|
|
{
|
|
struct drm_device *dev;
|
|
struct drm_crtc *new_crtc;
|
|
struct drm_encoder *save_encoders, *new_encoder, *encoder;
|
|
bool mode_changed = false; /* if true do a full mode set */
|
|
bool fb_changed = false; /* if true and !mode_changed just do a flip */
|
|
struct drm_connector *save_connectors, *connector;
|
|
int count = 0, ro, fail = 0;
|
|
struct drm_crtc_helper_funcs *crtc_funcs;
|
|
struct drm_mode_set save_set;
|
|
int ret;
|
|
int i;
|
|
|
|
DRM_DEBUG_KMS("\n");
|
|
|
|
BUG_ON(!set);
|
|
BUG_ON(!set->crtc);
|
|
BUG_ON(!set->crtc->helper_private);
|
|
|
|
/* Enforce sane interface api - has been abused by the fb helper. */
|
|
BUG_ON(!set->mode && set->fb);
|
|
BUG_ON(set->fb && set->num_connectors == 0);
|
|
|
|
crtc_funcs = set->crtc->helper_private;
|
|
|
|
if (!set->mode)
|
|
set->fb = NULL;
|
|
|
|
if (set->fb) {
|
|
DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
|
|
set->crtc->base.id, set->fb->base.id,
|
|
(int)set->num_connectors, set->x, set->y);
|
|
} else {
|
|
DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
|
|
return drm_crtc_helper_disable(set->crtc);
|
|
}
|
|
|
|
dev = set->crtc->dev;
|
|
|
|
/*
|
|
* Allocate space for the backup of all (non-pointer) encoder and
|
|
* connector data.
|
|
*/
|
|
save_encoders = kzalloc(dev->mode_config.num_encoder *
|
|
sizeof(struct drm_encoder), GFP_KERNEL);
|
|
if (!save_encoders)
|
|
return -ENOMEM;
|
|
|
|
save_connectors = kzalloc(dev->mode_config.num_connector *
|
|
sizeof(struct drm_connector), GFP_KERNEL);
|
|
if (!save_connectors) {
|
|
kfree(save_encoders);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Copy data. Note that driver private data is not affected.
|
|
* Should anything bad happen only the expected state is
|
|
* restored, not the drivers personal bookkeeping.
|
|
*/
|
|
count = 0;
|
|
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
save_encoders[count++] = *encoder;
|
|
}
|
|
|
|
count = 0;
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
save_connectors[count++] = *connector;
|
|
}
|
|
|
|
save_set.crtc = set->crtc;
|
|
save_set.mode = &set->crtc->mode;
|
|
save_set.x = set->crtc->x;
|
|
save_set.y = set->crtc->y;
|
|
save_set.fb = set->crtc->fb;
|
|
|
|
/* We should be able to check here if the fb has the same properties
|
|
* and then just flip_or_move it */
|
|
if (set->crtc->fb != set->fb) {
|
|
/* If we have no fb then treat it as a full mode set */
|
|
if (set->crtc->fb == NULL) {
|
|
DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
|
|
mode_changed = true;
|
|
} else if (set->fb == NULL) {
|
|
mode_changed = true;
|
|
} else if (set->fb->pixel_format !=
|
|
set->crtc->fb->pixel_format) {
|
|
mode_changed = true;
|
|
} else
|
|
fb_changed = true;
|
|
}
|
|
|
|
if (set->x != set->crtc->x || set->y != set->crtc->y)
|
|
fb_changed = true;
|
|
|
|
if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
|
|
DRM_DEBUG_KMS("modes are different, full mode set\n");
|
|
drm_mode_debug_printmodeline(&set->crtc->mode);
|
|
drm_mode_debug_printmodeline(set->mode);
|
|
mode_changed = true;
|
|
}
|
|
|
|
/* a) traverse passed in connector list and get encoders for them */
|
|
count = 0;
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
struct drm_connector_helper_funcs *connector_funcs =
|
|
connector->helper_private;
|
|
new_encoder = connector->encoder;
|
|
for (ro = 0; ro < set->num_connectors; ro++) {
|
|
if (set->connectors[ro] == connector) {
|
|
new_encoder = connector_funcs->best_encoder(connector);
|
|
/* if we can't get an encoder for a connector
|
|
we are setting now - then fail */
|
|
if (new_encoder == NULL)
|
|
/* don't break so fail path works correct */
|
|
fail = 1;
|
|
break;
|
|
|
|
if (connector->dpms != DRM_MODE_DPMS_ON) {
|
|
DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
|
|
mode_changed = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (new_encoder != connector->encoder) {
|
|
DRM_DEBUG_KMS("encoder changed, full mode switch\n");
|
|
mode_changed = true;
|
|
/* If the encoder is reused for another connector, then
|
|
* the appropriate crtc will be set later.
|
|
*/
|
|
if (connector->encoder)
|
|
connector->encoder->crtc = NULL;
|
|
connector->encoder = new_encoder;
|
|
}
|
|
}
|
|
|
|
if (fail) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
count = 0;
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
if (!connector->encoder)
|
|
continue;
|
|
|
|
if (connector->encoder->crtc == set->crtc)
|
|
new_crtc = NULL;
|
|
else
|
|
new_crtc = connector->encoder->crtc;
|
|
|
|
for (ro = 0; ro < set->num_connectors; ro++) {
|
|
if (set->connectors[ro] == connector)
|
|
new_crtc = set->crtc;
|
|
}
|
|
|
|
/* Make sure the new CRTC will work with the encoder */
|
|
if (new_crtc &&
|
|
!drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
if (new_crtc != connector->encoder->crtc) {
|
|
DRM_DEBUG_KMS("crtc changed, full mode switch\n");
|
|
mode_changed = true;
|
|
connector->encoder->crtc = new_crtc;
|
|
}
|
|
if (new_crtc) {
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
|
|
connector->base.id, drm_get_connector_name(connector),
|
|
new_crtc->base.id);
|
|
} else {
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
|
|
connector->base.id, drm_get_connector_name(connector));
|
|
}
|
|
}
|
|
|
|
/* mode_set_base is not a required function */
|
|
if (fb_changed && !crtc_funcs->mode_set_base)
|
|
mode_changed = true;
|
|
|
|
if (mode_changed) {
|
|
if (drm_helper_crtc_in_use(set->crtc)) {
|
|
DRM_DEBUG_KMS("attempting to set mode from"
|
|
" userspace\n");
|
|
drm_mode_debug_printmodeline(set->mode);
|
|
set->crtc->fb = set->fb;
|
|
if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
|
|
set->x, set->y,
|
|
save_set.fb)) {
|
|
DRM_ERROR("failed to set mode on [CRTC:%d]\n",
|
|
set->crtc->base.id);
|
|
set->crtc->fb = save_set.fb;
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
|
|
for (i = 0; i < set->num_connectors; i++) {
|
|
DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
|
|
drm_get_connector_name(set->connectors[i]));
|
|
set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
|
|
}
|
|
}
|
|
drm_helper_disable_unused_functions(dev);
|
|
} else if (fb_changed) {
|
|
set->crtc->x = set->x;
|
|
set->crtc->y = set->y;
|
|
set->crtc->fb = set->fb;
|
|
ret = crtc_funcs->mode_set_base(set->crtc,
|
|
set->x, set->y, save_set.fb);
|
|
if (ret != 0) {
|
|
set->crtc->x = save_set.x;
|
|
set->crtc->y = save_set.y;
|
|
set->crtc->fb = save_set.fb;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
kfree(save_connectors);
|
|
kfree(save_encoders);
|
|
return 0;
|
|
|
|
fail:
|
|
/* Restore all previous data. */
|
|
count = 0;
|
|
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
*encoder = save_encoders[count++];
|
|
}
|
|
|
|
count = 0;
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
*connector = save_connectors[count++];
|
|
}
|
|
|
|
/* Try to restore the config */
|
|
if (mode_changed &&
|
|
!drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
|
|
save_set.y, save_set.fb))
|
|
DRM_ERROR("failed to restore config after modeset failure\n");
|
|
|
|
kfree(save_connectors);
|
|
kfree(save_encoders);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_helper_set_config);
|
|
|
|
static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
|
|
{
|
|
int dpms = DRM_MODE_DPMS_OFF;
|
|
struct drm_connector *connector;
|
|
struct drm_device *dev = encoder->dev;
|
|
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
|
|
if (connector->encoder == encoder)
|
|
if (connector->dpms < dpms)
|
|
dpms = connector->dpms;
|
|
return dpms;
|
|
}
|
|
|
|
/* Helper which handles bridge ordering around encoder dpms */
|
|
static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
|
|
{
|
|
struct drm_bridge *bridge = encoder->bridge;
|
|
struct drm_encoder_helper_funcs *encoder_funcs;
|
|
|
|
if (bridge) {
|
|
if (mode == DRM_MODE_DPMS_ON)
|
|
bridge->funcs->pre_enable(bridge);
|
|
else
|
|
bridge->funcs->disable(bridge);
|
|
}
|
|
|
|
encoder_funcs = encoder->helper_private;
|
|
if (encoder_funcs->dpms)
|
|
encoder_funcs->dpms(encoder, mode);
|
|
|
|
if (bridge) {
|
|
if (mode == DRM_MODE_DPMS_ON)
|
|
bridge->funcs->enable(bridge);
|
|
else
|
|
bridge->funcs->post_disable(bridge);
|
|
}
|
|
}
|
|
|
|
static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
|
|
{
|
|
int dpms = DRM_MODE_DPMS_OFF;
|
|
struct drm_connector *connector;
|
|
struct drm_device *dev = crtc->dev;
|
|
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
|
|
if (connector->encoder && connector->encoder->crtc == crtc)
|
|
if (connector->dpms < dpms)
|
|
dpms = connector->dpms;
|
|
return dpms;
|
|
}
|
|
|
|
/**
|
|
* drm_helper_connector_dpms() - connector dpms helper implementation
|
|
* @connector: affected connector
|
|
* @mode: DPMS mode
|
|
*
|
|
* This is the main helper function provided by the crtc helper framework for
|
|
* implementing the DPMS connector attribute. It computes the new desired DPMS
|
|
* state for all encoders and crtcs in the output mesh and calls the ->dpms()
|
|
* callback provided by the driver appropriately.
|
|
*/
|
|
void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
|
|
{
|
|
struct drm_encoder *encoder = connector->encoder;
|
|
struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
|
|
int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
|
|
|
|
if (mode == connector->dpms)
|
|
return;
|
|
|
|
old_dpms = connector->dpms;
|
|
connector->dpms = mode;
|
|
|
|
if (encoder)
|
|
encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
|
|
|
|
/* from off to on, do crtc then encoder */
|
|
if (mode < old_dpms) {
|
|
if (crtc) {
|
|
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
|
|
if (crtc_funcs->dpms)
|
|
(*crtc_funcs->dpms) (crtc,
|
|
drm_helper_choose_crtc_dpms(crtc));
|
|
}
|
|
if (encoder)
|
|
drm_helper_encoder_dpms(encoder, encoder_dpms);
|
|
}
|
|
|
|
/* from on to off, do encoder then crtc */
|
|
if (mode > old_dpms) {
|
|
if (encoder)
|
|
drm_helper_encoder_dpms(encoder, encoder_dpms);
|
|
if (crtc) {
|
|
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
|
|
if (crtc_funcs->dpms)
|
|
(*crtc_funcs->dpms) (crtc,
|
|
drm_helper_choose_crtc_dpms(crtc));
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL(drm_helper_connector_dpms);
|
|
|
|
int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
|
|
struct drm_mode_fb_cmd2 *mode_cmd)
|
|
{
|
|
int i;
|
|
|
|
fb->width = mode_cmd->width;
|
|
fb->height = mode_cmd->height;
|
|
for (i = 0; i < 4; i++) {
|
|
fb->pitches[i] = mode_cmd->pitches[i];
|
|
fb->offsets[i] = mode_cmd->offsets[i];
|
|
}
|
|
drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
|
|
&fb->bits_per_pixel);
|
|
fb->pixel_format = mode_cmd->pixel_format;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
|
|
|
|
int drm_helper_resume_force_mode(struct drm_device *dev)
|
|
{
|
|
struct drm_crtc *crtc;
|
|
struct drm_encoder *encoder;
|
|
struct drm_crtc_helper_funcs *crtc_funcs;
|
|
int ret, encoder_dpms;
|
|
|
|
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
|
|
|
|
if (!crtc->enabled)
|
|
continue;
|
|
|
|
ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
|
|
crtc->x, crtc->y, crtc->fb);
|
|
|
|
if (ret == false)
|
|
DRM_ERROR("failed to set mode on crtc %p\n", crtc);
|
|
|
|
/* Turn off outputs that were already powered off */
|
|
if (drm_helper_choose_crtc_dpms(crtc)) {
|
|
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
|
|
|
|
if(encoder->crtc != crtc)
|
|
continue;
|
|
|
|
encoder_dpms = drm_helper_choose_encoder_dpms(
|
|
encoder);
|
|
|
|
drm_helper_encoder_dpms(encoder, encoder_dpms);
|
|
}
|
|
|
|
crtc_funcs = crtc->helper_private;
|
|
if (crtc_funcs->dpms)
|
|
(*crtc_funcs->dpms) (crtc,
|
|
drm_helper_choose_crtc_dpms(crtc));
|
|
}
|
|
}
|
|
/* disable the unused connectors while restoring the modesetting */
|
|
drm_helper_disable_unused_functions(dev);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_helper_resume_force_mode);
|
|
|
|
void drm_kms_helper_hotplug_event(struct drm_device *dev)
|
|
{
|
|
/* send a uevent + call fbdev */
|
|
drm_sysfs_hotplug_event(dev);
|
|
if (dev->mode_config.funcs->output_poll_changed)
|
|
dev->mode_config.funcs->output_poll_changed(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
|
|
|
|
#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
|
|
static void output_poll_execute(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work = to_delayed_work(work);
|
|
struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
|
|
struct drm_connector *connector;
|
|
enum drm_connector_status old_status;
|
|
bool repoll = false, changed = false;
|
|
|
|
if (!drm_kms_helper_poll)
|
|
return;
|
|
|
|
mutex_lock(&dev->mode_config.mutex);
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
|
|
/* Ignore forced connectors. */
|
|
if (connector->force)
|
|
continue;
|
|
|
|
/* Ignore HPD capable connectors and connectors where we don't
|
|
* want any hotplug detection at all for polling. */
|
|
if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
|
|
continue;
|
|
|
|
repoll = true;
|
|
|
|
old_status = connector->status;
|
|
/* if we are connected and don't want to poll for disconnect
|
|
skip it */
|
|
if (old_status == connector_status_connected &&
|
|
!(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
|
|
continue;
|
|
|
|
connector->status = connector->funcs->detect(connector, false);
|
|
if (old_status != connector->status) {
|
|
const char *old, *new;
|
|
|
|
old = drm_get_connector_status_name(old_status);
|
|
new = drm_get_connector_status_name(connector->status);
|
|
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
|
|
"status updated from %s to %s\n",
|
|
connector->base.id,
|
|
drm_get_connector_name(connector),
|
|
old, new);
|
|
|
|
changed = true;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&dev->mode_config.mutex);
|
|
|
|
if (changed)
|
|
drm_kms_helper_hotplug_event(dev);
|
|
|
|
if (repoll)
|
|
schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
|
|
}
|
|
|
|
void drm_kms_helper_poll_disable(struct drm_device *dev)
|
|
{
|
|
if (!dev->mode_config.poll_enabled)
|
|
return;
|
|
cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_poll_disable);
|
|
|
|
void drm_kms_helper_poll_enable(struct drm_device *dev)
|
|
{
|
|
bool poll = false;
|
|
struct drm_connector *connector;
|
|
|
|
if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
|
|
return;
|
|
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
|
|
DRM_CONNECTOR_POLL_DISCONNECT))
|
|
poll = true;
|
|
}
|
|
|
|
if (poll)
|
|
schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_poll_enable);
|
|
|
|
void drm_kms_helper_poll_init(struct drm_device *dev)
|
|
{
|
|
INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
|
|
dev->mode_config.poll_enabled = true;
|
|
|
|
drm_kms_helper_poll_enable(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_poll_init);
|
|
|
|
void drm_kms_helper_poll_fini(struct drm_device *dev)
|
|
{
|
|
drm_kms_helper_poll_disable(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_poll_fini);
|
|
|
|
bool drm_helper_hpd_irq_event(struct drm_device *dev)
|
|
{
|
|
struct drm_connector *connector;
|
|
enum drm_connector_status old_status;
|
|
bool changed = false;
|
|
|
|
if (!dev->mode_config.poll_enabled)
|
|
return false;
|
|
|
|
mutex_lock(&dev->mode_config.mutex);
|
|
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
|
|
|
|
/* Only handle HPD capable connectors. */
|
|
if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
|
|
continue;
|
|
|
|
old_status = connector->status;
|
|
|
|
connector->status = connector->funcs->detect(connector, false);
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
|
|
connector->base.id,
|
|
drm_get_connector_name(connector),
|
|
drm_get_connector_status_name(old_status),
|
|
drm_get_connector_status_name(connector->status));
|
|
if (old_status != connector->status)
|
|
changed = true;
|
|
}
|
|
|
|
mutex_unlock(&dev->mode_config.mutex);
|
|
|
|
if (changed)
|
|
drm_kms_helper_hotplug_event(dev);
|
|
|
|
return changed;
|
|
}
|
|
EXPORT_SYMBOL(drm_helper_hpd_irq_event);
|