![Ville Syrjälä](/assets/img/avatar_default.png)
Make sure the timings of probed modes at least pass some very basic sanity checks. The checks include: - clock,hdisplay,vdisplay are non zero - sync pulse fits within the blanking period - htotal,vtotal are big enough I have not checked all the drivers to see if the modes the generate might violate these constraints. I'm hoping not, because that would mean either abandoning the idea of doing this from the core code, or fixing the drivers. I'm not entirely sure about limiting the sync pulse to the blanking period. Intel hardware doesn't support such things, but some other hardware might. However at least HDMI doesn't allow having sync pulse edges within the active period, so I'm thinking the check is probably OK to have in the common code. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
473 lines
15 KiB
C
473 lines
15 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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/**
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* DOC: output probing helper overview
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*
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* This library provides some helper code for output probing. It provides an
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* implementation of the core connector->fill_modes interface with
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* drm_helper_probe_single_connector_modes.
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*
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* It also provides support for polling connectors with a work item and for
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* generic hotplug interrupt handling where the driver doesn't or cannot keep
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* track of a per-connector hpd interrupt.
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*
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* This helper library can be used independently of the modeset helper library.
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* Drivers can also overwrite different parts e.g. use their own hotplug
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* handling code to avoid probing unrelated outputs.
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*/
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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 enum drm_mode_status
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drm_mode_validate_flag(const struct drm_display_mode *mode,
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int flags)
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{
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if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
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!(flags & DRM_MODE_FLAG_INTERLACE))
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return 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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return 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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return MODE_NO_STEREO;
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return MODE_OK;
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}
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static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
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{
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struct drm_display_mode *mode;
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if (!connector->cmdline_mode.specified)
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return 0;
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mode = drm_mode_create_from_cmdline_mode(connector->dev,
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&connector->cmdline_mode);
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if (mode == NULL)
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return 0;
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drm_mode_probed_add(connector, mode);
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return 1;
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}
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static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
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uint32_t maxX, uint32_t maxY, bool merge_type_bits)
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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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WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
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connector->name);
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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->force == DRM_FORCE_ON_DIGITAL)
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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, connector->name);
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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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{
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if (connector->override_edid) {
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struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
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count = drm_add_edid_modes(connector, edid);
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} else
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count = (*connector_funcs->get_modes)(connector);
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}
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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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count += drm_helper_probe_add_cmdline_mode(connector);
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if (count == 0)
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goto prune;
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drm_mode_connector_list_update(connector, merge_type_bits);
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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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list_for_each_entry(mode, &connector->modes, head) {
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mode->status = drm_mode_validate_basic(mode);
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if (mode->status == MODE_OK)
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mode->status = drm_mode_validate_size(mode, maxX, maxY);
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if (mode->status == MODE_OK)
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mode->status = drm_mode_validate_flag(mode, mode_flags);
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if (mode->status == MODE_OK && connector_funcs->mode_valid)
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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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connector->name);
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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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/**
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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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* 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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* The 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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return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true);
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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_probe_single_connector_modes_nomerge - 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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* This operates like drm_hehlper_probe_single_connector_modes except it
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* replaces the mode bits instead of merging them for preferred modes.
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*/
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int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector,
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uint32_t maxX, uint32_t maxY)
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{
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return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false);
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}
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EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge);
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/**
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* drm_kms_helper_hotplug_event - fire off KMS hotplug events
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* @dev: drm_device whose connector state changed
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*
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* This function fires off the uevent for userspace and also calls the
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* output_poll_changed function, which is most commonly used to inform the fbdev
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* emulation code and allow it to update the fbcon output configuration.
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*
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* Drivers should call this from their hotplug handling code when a change is
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* detected. Note that this function does not do any output detection of its
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* own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
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* driver already.
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*
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* This function must be called from process context with no mode
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* setting locks held.
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*/
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void drm_kms_helper_hotplug_event(struct drm_device *dev)
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{
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/* send a uevent + call fbdev */
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drm_sysfs_hotplug_event(dev);
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if (dev->mode_config.funcs->output_poll_changed)
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dev->mode_config.funcs->output_poll_changed(dev);
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}
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EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
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#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
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static void output_poll_execute(struct work_struct *work)
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{
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struct delayed_work *delayed_work = to_delayed_work(work);
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struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
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struct drm_connector *connector;
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enum drm_connector_status old_status;
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bool repoll = false, changed = false;
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if (!drm_kms_helper_poll)
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return;
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mutex_lock(&dev->mode_config.mutex);
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list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
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/* Ignore forced connectors. */
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if (connector->force)
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continue;
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/* Ignore HPD capable connectors and connectors where we don't
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* want any hotplug detection at all for polling. */
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if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
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continue;
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repoll = true;
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old_status = connector->status;
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/* if we are connected and don't want to poll for disconnect
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skip it */
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if (old_status == connector_status_connected &&
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!(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
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continue;
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connector->status = connector->funcs->detect(connector, false);
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if (old_status != connector->status) {
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const char *old, *new;
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old = drm_get_connector_status_name(old_status);
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new = drm_get_connector_status_name(connector->status);
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
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"status updated from %s to %s\n",
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connector->base.id,
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connector->name,
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old, new);
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changed = true;
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}
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}
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mutex_unlock(&dev->mode_config.mutex);
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if (changed)
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drm_kms_helper_hotplug_event(dev);
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if (repoll)
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schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
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}
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/**
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* drm_kms_helper_poll_disable - disable output polling
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* @dev: drm_device
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*
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* This function disables the output polling work.
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*
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* Drivers can call this helper from their device suspend implementation. It is
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* not an error to call this even when output polling isn't enabled or arlready
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* disabled.
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*/
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void drm_kms_helper_poll_disable(struct drm_device *dev)
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{
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if (!dev->mode_config.poll_enabled)
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return;
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cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_disable);
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/**
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* drm_kms_helper_poll_enable - re-enable output polling.
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* @dev: drm_device
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*
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* This function re-enables the output polling work.
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*
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* Drivers can call this helper from their device resume implementation. It is
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* an error to call this when the output polling support has not yet been set
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* up.
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*/
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void drm_kms_helper_poll_enable(struct drm_device *dev)
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{
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bool poll = false;
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struct drm_connector *connector;
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if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
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return;
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list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
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if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
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DRM_CONNECTOR_POLL_DISCONNECT))
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poll = true;
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}
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if (poll)
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schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_enable);
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/**
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* drm_kms_helper_poll_init - initialize and enable output polling
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* @dev: drm_device
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*
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* This function intializes and then also enables output polling support for
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* @dev. Drivers which do not have reliable hotplug support in hardware can use
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* this helper infrastructure to regularly poll such connectors for changes in
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* their connection state.
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*
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* Drivers can control which connectors are polled by setting the
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* DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
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* connectors where probing live outputs can result in visual distortion drivers
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* should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
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* Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
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* completely ignored by the polling logic.
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*
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* Note that a connector can be both polled and probed from the hotplug handler,
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* in case the hotplug interrupt is known to be unreliable.
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*/
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void drm_kms_helper_poll_init(struct drm_device *dev)
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{
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INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
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dev->mode_config.poll_enabled = true;
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drm_kms_helper_poll_enable(dev);
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_init);
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/**
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* drm_kms_helper_poll_fini - disable output polling and clean it up
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* @dev: drm_device
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*/
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void drm_kms_helper_poll_fini(struct drm_device *dev)
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{
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drm_kms_helper_poll_disable(dev);
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_fini);
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/**
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* drm_helper_hpd_irq_event - hotplug processing
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* @dev: drm_device
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*
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* Drivers can use this helper function to run a detect cycle on all connectors
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* which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
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* other connectors are ignored, which is useful to avoid reprobing fixed
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* panels.
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*
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* This helper function is useful for drivers which can't or don't track hotplug
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* interrupts for each connector.
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*
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* Drivers which support hotplug interrupts for each connector individually and
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* which have a more fine-grained detect logic should bypass this code and
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* directly call drm_kms_helper_hotplug_event() in case the connector state
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* changed.
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*
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* This function must be called from process context with no mode
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* setting locks held.
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*
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* Note that a connector can be both polled and probed from the hotplug handler,
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* in case the hotplug interrupt is known to be unreliable.
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*/
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bool drm_helper_hpd_irq_event(struct drm_device *dev)
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{
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struct drm_connector *connector;
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enum drm_connector_status old_status;
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bool changed = false;
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if (!dev->mode_config.poll_enabled)
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return false;
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mutex_lock(&dev->mode_config.mutex);
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list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
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/* Only handle HPD capable connectors. */
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if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
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continue;
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old_status = connector->status;
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connector->status = connector->funcs->detect(connector, false);
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
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connector->base.id,
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connector->name,
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drm_get_connector_status_name(old_status),
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drm_get_connector_status_name(connector->status));
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if (old_status != connector->status)
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changed = true;
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}
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mutex_unlock(&dev->mode_config.mutex);
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if (changed)
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drm_kms_helper_hotplug_event(dev);
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return changed;
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}
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EXPORT_SYMBOL(drm_helper_hpd_irq_event);
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