| /* |
| * Copyright (c) 2006-2008 Intel Corporation |
| * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> |
| * |
| * DRM core CRTC related functions |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting documentation, and |
| * that the name of the copyright holders not be used in advertising or |
| * publicity pertaining to distribution of the software without specific, |
| * written prior permission. The copyright holders make no representations |
| * about the suitability of this software for any purpose. It is provided "as |
| * is" without express or implied warranty. |
| * |
| * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| * |
| * Authors: |
| * Keith Packard |
| * Eric Anholt <eric@anholt.net> |
| * Dave Airlie <airlied@linux.ie> |
| * Jesse Barnes <jesse.barnes@intel.com> |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/moduleparam.h> |
| |
| #include <drm/drmP.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_fourcc.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_edid.h> |
| |
| /** |
| * DOC: output probing helper overview |
| * |
| * This library provides some helper code for output probing. It provides an |
| * implementation of the core connector->fill_modes interface with |
| * drm_helper_probe_single_connector_modes. |
| * |
| * It also provides support for polling connectors with a work item and for |
| * generic hotplug interrupt handling where the driver doesn't or cannot keep |
| * track of a per-connector hpd interrupt. |
| * |
| * 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. |
| */ |
| |
| static bool drm_kms_helper_poll = true; |
| module_param_named(poll, drm_kms_helper_poll, bool, 0600); |
| |
| static void drm_mode_validate_flag(struct drm_connector *connector, |
| int flags) |
| { |
| struct drm_display_mode *mode; |
| |
| if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE | |
| DRM_MODE_FLAG_3D_MASK)) |
| return; |
| |
| list_for_each_entry(mode, &connector->modes, head) { |
| if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
| !(flags & DRM_MODE_FLAG_INTERLACE)) |
| mode->status = MODE_NO_INTERLACE; |
| if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
| !(flags & DRM_MODE_FLAG_DBLSCAN)) |
| mode->status = MODE_NO_DBLESCAN; |
| if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
| !(flags & DRM_MODE_FLAG_3D_MASK)) |
| mode->status = MODE_NO_STEREO; |
| } |
| |
| return; |
| } |
| |
| /** |
| * 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) |
| { |
| struct drm_device *dev = connector->dev; |
| struct drm_display_mode *mode; |
| struct drm_connector_helper_funcs *connector_funcs = |
| connector->helper_private; |
| int count = 0; |
| int mode_flags = 0; |
| bool verbose_prune = true; |
| |
| WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
| |
| DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
| drm_get_connector_name(connector)); |
| /* set all modes to the unverified state */ |
| list_for_each_entry(mode, &connector->modes, head) |
| mode->status = MODE_UNVERIFIED; |
| |
| if (connector->force) { |
| if (connector->force == DRM_FORCE_ON) |
| connector->status = connector_status_connected; |
| else |
| connector->status = connector_status_disconnected; |
| if (connector->funcs->force) |
| connector->funcs->force(connector); |
| } else { |
| connector->status = connector->funcs->detect(connector, true); |
| } |
| |
| /* Re-enable polling in case the global poll config changed. */ |
| if (drm_kms_helper_poll != dev->mode_config.poll_running) |
| drm_kms_helper_poll_enable(dev); |
| |
| dev->mode_config.poll_running = drm_kms_helper_poll; |
| |
| if (connector->status == connector_status_disconnected) { |
| DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
| connector->base.id, drm_get_connector_name(connector)); |
| drm_mode_connector_update_edid_property(connector, NULL); |
| verbose_prune = false; |
| goto prune; |
| } |
| |
| #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
| count = drm_load_edid_firmware(connector); |
| if (count == 0) |
| #endif |
| count = (*connector_funcs->get_modes)(connector); |
| |
| if (count == 0 && connector->status == connector_status_connected) |
| count = drm_add_modes_noedid(connector, 1024, 768); |
| if (count == 0) |
| goto prune; |
| |
| drm_mode_connector_list_update(connector); |
| |
| if (maxX && maxY) |
| drm_mode_validate_size(dev, &connector->modes, maxX, maxY); |
| |
| if (connector->interlace_allowed) |
| mode_flags |= DRM_MODE_FLAG_INTERLACE; |
| if (connector->doublescan_allowed) |
| mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
| if (connector->stereo_allowed) |
| mode_flags |= DRM_MODE_FLAG_3D_MASK; |
| drm_mode_validate_flag(connector, mode_flags); |
| |
| list_for_each_entry(mode, &connector->modes, head) { |
| if (mode->status == MODE_OK) |
| mode->status = connector_funcs->mode_valid(connector, |
| mode); |
| } |
| |
| prune: |
| drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
| |
| if (list_empty(&connector->modes)) |
| return 0; |
| |
| list_for_each_entry(mode, &connector->modes, head) |
| mode->vrefresh = drm_mode_vrefresh(mode); |
| |
| drm_mode_sort(&connector->modes); |
| |
| DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
| drm_get_connector_name(connector)); |
| list_for_each_entry(mode, &connector->modes, head) { |
| drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
| drm_mode_debug_printmodeline(mode); |
| } |
| |
| return count; |
| } |
| EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
| |
| /** |
| * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
| * @dev: drm_device whose connector state changed |
| * |
| * This function fires off the uevent for userspace and also calls the |
| * output_poll_changed function, which is most commonly used to inform the fbdev |
| * emulation code and allow it to update the fbcon output configuration. |
| * |
| * Drivers should call this from their hotplug handling code when a change is |
| * detected. Note that this function does not do any output detection of its |
| * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
| * driver already. |
| * |
| * This function must be called from process context with no mode |
| * setting locks held. |
| */ |
| 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); |
| } |
| |
| /** |
| * drm_kms_helper_poll_disable - disable output polling |
| * @dev: drm_device |
| * |
| * This function disables the output polling work. |
| * |
| * Drivers can call this helper from their device suspend implementation. It is |
| * not an error to call this even when output polling isn't enabled or arlready |
| * disabled. |
| */ |
| 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); |
| |
| /** |
| * drm_kms_helper_poll_enable - re-enable output polling. |
| * @dev: drm_device |
| * |
| * This function re-enables the output polling work. |
| * |
| * Drivers can call this helper from their device resume implementation. It is |
| * an error to call this when the output polling support has not yet been set |
| * up. |
| */ |
| 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); |
| |
| /** |
| * drm_kms_helper_poll_init - initialize and enable output polling |
| * @dev: drm_device |
| * |
| * This function intializes and then also enables output polling support for |
| * @dev. Drivers which do not have reliable hotplug support in hardware can use |
| * this helper infrastructure to regularly poll such connectors for changes in |
| * their connection state. |
| * |
| * Drivers can control which connectors are polled by setting the |
| * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
| * connectors where probing live outputs can result in visual distortion drivers |
| * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
| * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
| * completely ignored by the polling logic. |
| * |
| * Note that a connector can be both polled and probed from the hotplug handler, |
| * in case the hotplug interrupt is known to be unreliable. |
| */ |
| 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); |
| |
| /** |
| * drm_kms_helper_poll_fini - disable output polling and clean it up |
| * @dev: drm_device |
| */ |
| void drm_kms_helper_poll_fini(struct drm_device *dev) |
| { |
| drm_kms_helper_poll_disable(dev); |
| } |
| EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
| |
| /** |
| * drm_helper_hpd_irq_event - hotplug processing |
| * @dev: drm_device |
| * |
| * Drivers can use this helper function to run a detect cycle on all connectors |
| * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
| * other connectors are ignored, which is useful to avoid reprobing fixed |
| * panels. |
| * |
| * This helper function is useful for drivers which can't or don't track hotplug |
| * interrupts for each connector. |
| * |
| * Drivers which support hotplug interrupts for each connector individually and |
| * which have a more fine-grained detect logic should bypass this code and |
| * directly call drm_kms_helper_hotplug_event() in case the connector state |
| * changed. |
| * |
| * This function must be called from process context with no mode |
| * setting locks held. |
| * |
| * Note that a connector can be both polled and probed from the hotplug handler, |
| * in case the hotplug interrupt is known to be unreliable. |
| */ |
| 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); |