diff options
Diffstat (limited to 'drivers/gpu/drm/drm_probe_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_probe_helper.c | 174 |
1 files changed, 96 insertions, 78 deletions
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index f8b5fcfa91a2..e714b5a7955f 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -53,6 +53,9 @@ * This helper library can be used independently of the modeset helper library. * Drivers can also overwrite different parts e.g. use their own hotplug * handling code to avoid probing unrelated outputs. + * + * The probe helpers share the function table structures with other display + * helper libraries. See struct &drm_connector_helper_funcs for the details. */ static bool drm_kms_helper_poll = true; @@ -126,9 +129,64 @@ void drm_kms_helper_poll_enable_locked(struct drm_device *dev) } EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); - -static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, - uint32_t maxX, uint32_t maxY, bool merge_type_bits) +/** + * drm_helper_probe_single_connector_modes - get complete set of display modes + * @connector: connector to probe + * @maxX: max width for modes + * @maxY: max height for modes + * + * Based on the helper callbacks implemented by @connector in struct + * &drm_connector_helper_funcs try to detect all valid modes. Modes will first + * be added to the connector's probed_modes list, then culled (based on validity + * and the @maxX, @maxY parameters) and put into the normal modes list. + * + * Intended to be used as a generic implementation of the ->fill_modes() + * @connector vfunc for drivers that use the CRTC helpers for output mode + * filtering and detection. + * + * The basic procedure is as follows + * + * 1. All modes currently on the connector's modes list are marked as stale + * + * 2. New modes are added to the connector's probed_modes list with + * drm_mode_probed_add(). New modes start their life with status as OK. + * Modes are added from a single source using the following priority order. + * + * - debugfs 'override_edid' (used for testing only) + * - firmware EDID (drm_load_edid_firmware()) + * - connector helper ->get_modes() vfunc + * - if the connector status is connector_status_connected, standard + * VESA DMT modes up to 1024x768 are automatically added + * (drm_add_modes_noedid()) + * + * Finally modes specified via the kernel command line (video=...) are + * added in addition to what the earlier probes produced + * (drm_helper_probe_add_cmdline_mode()). These modes are generated + * using the VESA GTF/CVT formulas. + * + * 3. Modes are moved from the probed_modes list to the modes list. Potential + * duplicates are merged together (see drm_mode_connector_list_update()). + * After this step the probed_modes list will be empty again. + * + * 4. Any non-stale mode on the modes list then undergoes validation + * + * - drm_mode_validate_basic() performs basic sanity checks + * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY + * (if specified) + * - drm_mode_validate_flag() checks the modes againt basic connector + * capabilites (interlace_allowed,doublescan_allowed,stereo_allowed) + * - the optional connector ->mode_valid() helper can perform driver and/or + * hardware specific checks + * + * 5. Any mode whose status is not OK is pruned from the connector's modes list, + * accompanied by a debug message indicating the reason for the mode's + * rejection (see drm_mode_prune_invalid()). + * + * Returns: + * The number of modes found on @connector. + */ +int drm_helper_probe_single_connector_modes(struct drm_connector *connector, + uint32_t maxX, uint32_t maxY) { struct drm_device *dev = connector->dev; struct drm_display_mode *mode; @@ -143,9 +201,11 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name); - /* set all modes to the unverified state */ + /* set all old modes to the stale state */ list_for_each_entry(mode, &connector->modes, head) - mode->status = MODE_UNVERIFIED; + mode->status = MODE_STALE; + + old_status = connector->status; if (connector->force) { if (connector->force == DRM_FORCE_ON || @@ -156,33 +216,32 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect if (connector->funcs->force) connector->funcs->force(connector); } else { - old_status = connector->status; - connector->status = connector->funcs->detect(connector, true); + } + + /* + * Normally either the driver's hpd code or the poll loop should + * pick up any changes and fire the hotplug event. But if + * userspace sneaks in a probe, we might miss a change. Hence + * check here, and if anything changed start the hotplug code. + */ + if (old_status != connector->status) { + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", + connector->base.id, + connector->name, + drm_get_connector_status_name(old_status), + drm_get_connector_status_name(connector->status)); /* - * Normally either the driver's hpd code or the poll loop should - * pick up any changes and fire the hotplug event. But if - * userspace sneaks in a probe, we might miss a change. Hence - * check here, and if anything changed start the hotplug code. + * The hotplug event code might call into the fb + * helpers, and so expects that we do not hold any + * locks. Fire up the poll struct instead, it will + * disable itself again. */ - if (old_status != connector->status) { - DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n", - connector->base.id, - connector->name, - old_status, connector->status); - - /* - * The hotplug event code might call into the fb - * helpers, and so expects that we do not hold any - * locks. Fire up the poll struct instead, it will - * disable itself again. - */ - dev->mode_config.delayed_event = true; - if (dev->mode_config.poll_enabled) - schedule_delayed_work(&dev->mode_config.output_poll_work, - 0); - } + dev->mode_config.delayed_event = true; + if (dev->mode_config.poll_enabled) + schedule_delayed_work(&dev->mode_config.output_poll_work, + 0); } /* Re-enable polling in case the global poll config changed. */ @@ -199,17 +258,16 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect goto prune; } + if (connector->override_edid) { + struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; + + count = drm_add_edid_modes(connector, edid); + drm_edid_to_eld(connector, edid); + } else { #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE - count = drm_load_edid_firmware(connector); - if (count == 0) + count = drm_load_edid_firmware(connector); + if (count == 0) #endif - { - if (connector->override_edid) { - struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; - - count = drm_add_edid_modes(connector, edid); - drm_edid_to_eld(connector, edid); - } else count = (*connector_funcs->get_modes)(connector); } @@ -219,7 +277,7 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect if (count == 0) goto prune; - drm_mode_connector_list_update(connector, merge_type_bits); + drm_mode_connector_list_update(connector); if (connector->interlace_allowed) mode_flags |= DRM_MODE_FLAG_INTERLACE; @@ -263,49 +321,9 @@ prune: return count; } - -/** - * drm_helper_probe_single_connector_modes - get complete set of display modes - * @connector: connector to probe - * @maxX: max width for modes - * @maxY: max height for modes - * - * Based on the helper callbacks implemented by @connector try to detect all - * valid modes. Modes will first be added to the connector's probed_modes list, - * then culled (based on validity and the @maxX, @maxY parameters) and put into - * the normal modes list. - * - * Intended to be use as a generic implementation of the ->fill_modes() - * @connector vfunc for drivers that use the crtc helpers for output mode - * filtering and detection. - * - * Returns: - * The number of modes found on @connector. - */ -int drm_helper_probe_single_connector_modes(struct drm_connector *connector, - uint32_t maxX, uint32_t maxY) -{ - return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); -} EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); /** - * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes - * @connector: connector to probe - * @maxX: max width for modes - * @maxY: max height for modes - * - * This operates like drm_hehlper_probe_single_connector_modes except it - * replaces the mode bits instead of merging them for preferred modes. - */ -int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, - uint32_t maxX, uint32_t maxY) -{ - return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); -} -EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); - -/** * drm_kms_helper_hotplug_event - fire off KMS hotplug events * @dev: drm_device whose connector state changed * |