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  1. /*
  2.  * Copyright (c) 2006-2008 Intel Corporation
  3.  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
  4.  *
  5.  * DRM core CRTC related functions
  6.  *
  7.  * Permission to use, copy, modify, distribute, and sell this software and its
  8.  * documentation for any purpose is hereby granted without fee, provided that
  9.  * the above copyright notice appear in all copies and that both that copyright
  10.  * notice and this permission notice appear in supporting documentation, and
  11.  * that the name of the copyright holders not be used in advertising or
  12.  * publicity pertaining to distribution of the software without specific,
  13.  * written prior permission.  The copyright holders make no representations
  14.  * about the suitability of this software for any purpose.  It is provided "as
  15.  * is" without express or implied warranty.
  16.  *
  17.  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18.  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19.  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20.  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21.  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22.  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23.  * OF THIS SOFTWARE.
  24.  *
  25.  * Authors:
  26.  *      Keith Packard
  27.  *      Eric Anholt <eric@anholt.net>
  28.  *      Dave Airlie <airlied@linux.ie>
  29.  *      Jesse Barnes <jesse.barnes@intel.com>
  30.  */
  31.  
  32. #include <linux/export.h>
  33. #include <linux/moduleparam.h>
  34.  
  35. #include <drm/drmP.h>
  36. #include <drm/drm_crtc.h>
  37. #include <drm/drm_fourcc.h>
  38. #include <drm/drm_crtc_helper.h>
  39. #include <drm/drm_fb_helper.h>
  40. #include <drm/drm_edid.h>
  41.  
  42. /**
  43.  * DOC: output probing helper overview
  44.  *
  45.  * This library provides some helper code for output probing. It provides an
  46.  * implementation of the core connector->fill_modes interface with
  47.  * drm_helper_probe_single_connector_modes.
  48.  *
  49.  * It also provides support for polling connectors with a work item and for
  50.  * generic hotplug interrupt handling where the driver doesn't or cannot keep
  51.  * track of a per-connector hpd interrupt.
  52.  *
  53.  * This helper library can be used independently of the modeset helper library.
  54.  * Drivers can also overwrite different parts e.g. use their own hotplug
  55.  * handling code to avoid probing unrelated outputs.
  56.  */
  57.  
  58. static bool drm_kms_helper_poll = true;
  59. module_param_named(poll, drm_kms_helper_poll, bool, 0600);
  60.  
  61. static enum drm_mode_status
  62. drm_mode_validate_flag(const struct drm_display_mode *mode,
  63.                        int flags)
  64. {
  65.         if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  66.             !(flags & DRM_MODE_FLAG_INTERLACE))
  67.                 return MODE_NO_INTERLACE;
  68.  
  69.         if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  70.             !(flags & DRM_MODE_FLAG_DBLSCAN))
  71.                 return MODE_NO_DBLESCAN;
  72.  
  73.         if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
  74.             !(flags & DRM_MODE_FLAG_3D_MASK))
  75.                 return MODE_NO_STEREO;
  76.  
  77.         return MODE_OK;
  78. }
  79.  
  80. static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
  81. {
  82.         struct drm_display_mode *mode;
  83.  
  84.         if (!connector->cmdline_mode.specified)
  85.                 return 0;
  86.  
  87.         mode = drm_mode_create_from_cmdline_mode(connector->dev,
  88.                                                  &connector->cmdline_mode);
  89.         if (mode == NULL)
  90.                 return 0;
  91.  
  92.         drm_mode_probed_add(connector, mode);
  93.         return 1;
  94. }
  95.  
  96. #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
  97. /**
  98.  * drm_kms_helper_poll_enable_locked - re-enable output polling.
  99.  * @dev: drm_device
  100.  *
  101.  * This function re-enables the output polling work without
  102.  * locking the mode_config mutex.
  103.  *
  104.  * This is like drm_kms_helper_poll_enable() however it is to be
  105.  * called from a context where the mode_config mutex is locked
  106.  * already.
  107.  */
  108. void drm_kms_helper_poll_enable_locked(struct drm_device *dev)
  109. {
  110.         bool poll = false;
  111.         struct drm_connector *connector;
  112.  
  113.         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
  114.  
  115.         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
  116.                 return;
  117.  
  118.         drm_for_each_connector(connector, dev) {
  119.                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
  120.                                          DRM_CONNECTOR_POLL_DISCONNECT))
  121.                         poll = true;
  122.         }
  123.  
  124. }
  125. EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked);
  126.  
  127.  
  128. static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
  129.                                                               uint32_t maxX, uint32_t maxY, bool merge_type_bits)
  130. {
  131.         struct drm_device *dev = connector->dev;
  132.         struct drm_display_mode *mode;
  133.         const struct drm_connector_helper_funcs *connector_funcs =
  134.                 connector->helper_private;
  135.         int count = 0;
  136.         int mode_flags = 0;
  137.         bool verbose_prune = true;
  138.         enum drm_connector_status old_status;
  139.  
  140.         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
  141.  
  142.         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
  143.                         connector->name);
  144.         /* set all modes to the unverified state */
  145.         list_for_each_entry(mode, &connector->modes, head)
  146.                 mode->status = MODE_UNVERIFIED;
  147.  
  148.         if (connector->force) {
  149.                 if (connector->force == DRM_FORCE_ON ||
  150.                     connector->force == DRM_FORCE_ON_DIGITAL)
  151.                         connector->status = connector_status_connected;
  152.                 else
  153.                         connector->status = connector_status_disconnected;
  154.                 if (connector->funcs->force)
  155.                         connector->funcs->force(connector);
  156.         } else {
  157.                 old_status = connector->status;
  158.  
  159.                 connector->status = connector->funcs->detect(connector, true);
  160.         }
  161.  
  162.         /* Re-enable polling in case the global poll config changed. */
  163.         if (drm_kms_helper_poll != dev->mode_config.poll_running)
  164.                 drm_kms_helper_poll_enable_locked(dev);
  165.  
  166.         dev->mode_config.poll_running = drm_kms_helper_poll;
  167.  
  168.         if (connector->status == connector_status_disconnected) {
  169.                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
  170.                         connector->base.id, connector->name);
  171.                 drm_mode_connector_update_edid_property(connector, NULL);
  172.                 verbose_prune = false;
  173.                 goto prune;
  174.         }
  175.  
  176. #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
  177.         count = drm_load_edid_firmware(connector);
  178.         if (count == 0)
  179. #endif
  180.         {
  181.                 if (connector->override_edid) {
  182.                         struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
  183.  
  184.                         count = drm_add_edid_modes(connector, edid);
  185.                         drm_edid_to_eld(connector, edid);
  186.                 } else
  187.                         count = (*connector_funcs->get_modes)(connector);
  188.         }
  189.  
  190.         if (count == 0 && connector->status == connector_status_connected)
  191.                 count = drm_add_modes_noedid(connector, 1024, 768);
  192.         count += drm_helper_probe_add_cmdline_mode(connector);
  193.         if (count == 0)
  194.                 goto prune;
  195.  
  196.         drm_mode_connector_list_update(connector, merge_type_bits);
  197.  
  198.         if (connector->interlace_allowed)
  199.                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
  200.         if (connector->doublescan_allowed)
  201.                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
  202.         if (connector->stereo_allowed)
  203.                 mode_flags |= DRM_MODE_FLAG_3D_MASK;
  204.  
  205.         list_for_each_entry(mode, &connector->modes, head) {
  206.                 if (mode->status == MODE_OK)
  207.                         mode->status = drm_mode_validate_basic(mode);
  208.  
  209.                 if (mode->status == MODE_OK)
  210.                         mode->status = drm_mode_validate_size(mode, maxX, maxY);
  211.  
  212.                 if (mode->status == MODE_OK)
  213.                         mode->status = drm_mode_validate_flag(mode, mode_flags);
  214.  
  215.                 if (mode->status == MODE_OK && connector_funcs->mode_valid)
  216.                         mode->status = connector_funcs->mode_valid(connector,
  217.                                                                    mode);
  218.         }
  219.  
  220. prune:
  221.         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
  222.  
  223.         if (list_empty(&connector->modes))
  224.                 return 0;
  225.  
  226.         list_for_each_entry(mode, &connector->modes, head)
  227.                 mode->vrefresh = drm_mode_vrefresh(mode);
  228.  
  229.         drm_mode_sort(&connector->modes);
  230.  
  231.         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
  232.                         connector->name);
  233.         list_for_each_entry(mode, &connector->modes, head) {
  234.                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  235.                 drm_mode_debug_printmodeline(mode);
  236.         }
  237.  
  238.         return count;
  239. }
  240.  
  241. /**
  242.  * drm_helper_probe_single_connector_modes - get complete set of display modes
  243.  * @connector: connector to probe
  244.  * @maxX: max width for modes
  245.  * @maxY: max height for modes
  246.  *
  247.  * Based on the helper callbacks implemented by @connector try to detect all
  248.  * valid modes.  Modes will first be added to the connector's probed_modes list,
  249.  * then culled (based on validity and the @maxX, @maxY parameters) and put into
  250.  * the normal modes list.
  251.  *
  252.  * Intended to be use as a generic implementation of the ->fill_modes()
  253.  * @connector vfunc for drivers that use the crtc helpers for output mode
  254.  * filtering and detection.
  255.  *
  256.  * Returns:
  257.  * The number of modes found on @connector.
  258.  */
  259. int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  260.                                             uint32_t maxX, uint32_t maxY)
  261. {
  262.         return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true);
  263. }
  264. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  265.  
  266. /**
  267.  * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes
  268.  * @connector: connector to probe
  269.  * @maxX: max width for modes
  270.  * @maxY: max height for modes
  271.  *
  272.  * This operates like drm_hehlper_probe_single_connector_modes except it
  273.  * replaces the mode bits instead of merging them for preferred modes.
  274.  */
  275. int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector,
  276.                                             uint32_t maxX, uint32_t maxY)
  277. {
  278.         return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false);
  279. }
  280. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge);
  281.  
  282. /**
  283.  * drm_kms_helper_hotplug_event - fire off KMS hotplug events
  284.  * @dev: drm_device whose connector state changed
  285.  *
  286.  * This function fires off the uevent for userspace and also calls the
  287.  * output_poll_changed function, which is most commonly used to inform the fbdev
  288.  * emulation code and allow it to update the fbcon output configuration.
  289.  *
  290.  * Drivers should call this from their hotplug handling code when a change is
  291.  * detected. Note that this function does not do any output detection of its
  292.  * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
  293.  * driver already.
  294.  *
  295.  * This function must be called from process context with no mode
  296.  * setting locks held.
  297.  */
  298. void drm_kms_helper_hotplug_event(struct drm_device *dev)
  299. {
  300.         /* send a uevent + call fbdev */
  301. //   drm_sysfs_hotplug_event(dev);
  302. //   if (dev->mode_config.funcs->output_poll_changed)
  303. //       dev->mode_config.funcs->output_poll_changed(dev);
  304. }
  305. EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
  306.  
  307. static void output_poll_execute(struct work_struct *work)
  308. {
  309.         struct delayed_work *delayed_work = to_delayed_work(work);
  310.         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
  311.         struct drm_connector *connector;
  312.         enum drm_connector_status old_status;
  313.         bool repoll = false, changed;
  314.  
  315.         /* Pick up any changes detected by the probe functions. */
  316.         changed = dev->mode_config.delayed_event;
  317.         dev->mode_config.delayed_event = false;
  318.  
  319.         if (!drm_kms_helper_poll)
  320.                 goto out;
  321.  
  322.         mutex_lock(&dev->mode_config.mutex);
  323.         drm_for_each_connector(connector, dev) {
  324.  
  325.                 /* Ignore forced connectors. */
  326.                 if (connector->force)
  327.                         continue;
  328.  
  329.                 /* Ignore HPD capable connectors and connectors where we don't
  330.                  * want any hotplug detection at all for polling. */
  331.                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
  332.                         continue;
  333.  
  334.                 old_status = connector->status;
  335.                 /* if we are connected and don't want to poll for disconnect
  336.                    skip it */
  337.                 if (old_status == connector_status_connected &&
  338.                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
  339.                         continue;
  340.  
  341.                 repoll = true;
  342.  
  343.                 connector->status = connector->funcs->detect(connector, false);
  344.                 if (old_status != connector->status) {
  345.                         const char *old, *new;
  346.  
  347.                         /*
  348.                          * The poll work sets force=false when calling detect so
  349.                          * that drivers can avoid to do disruptive tests (e.g.
  350.                          * when load detect cycles could cause flickering on
  351.                          * other, running displays). This bears the risk that we
  352.                          * flip-flop between unknown here in the poll work and
  353.                          * the real state when userspace forces a full detect
  354.                          * call after receiving a hotplug event due to this
  355.                          * change.
  356.                          *
  357.                          * Hence clamp an unknown detect status to the old
  358.                          * value.
  359.                          */
  360.                         if (connector->status == connector_status_unknown) {
  361.                                 connector->status = old_status;
  362.                                 continue;
  363.                         }
  364.  
  365.                         old = drm_get_connector_status_name(old_status);
  366.                         new = drm_get_connector_status_name(connector->status);
  367.  
  368.                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
  369.                                       "status updated from %s to %s\n",
  370.                                       connector->base.id,
  371.                                       connector->name,
  372.                                       old, new);
  373.  
  374.                         changed = true;
  375.                 }
  376.         }
  377.  
  378.         mutex_unlock(&dev->mode_config.mutex);
  379.  
  380. out: ;
  381.  
  382. //   if (changed)
  383. //       drm_kms_helper_hotplug_event(dev);
  384.  
  385. //   if (repoll)
  386. //       schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
  387. }
  388.  
  389. /**
  390.  * drm_kms_helper_poll_disable - disable output polling
  391.  * @dev: drm_device
  392.  *
  393.  * This function disables the output polling work.
  394.  *
  395.  * Drivers can call this helper from their device suspend implementation. It is
  396.  * not an error to call this even when output polling isn't enabled or arlready
  397.  * disabled.
  398.  */
  399. void drm_kms_helper_poll_disable(struct drm_device *dev)
  400. {
  401.         if (!dev->mode_config.poll_enabled)
  402.                 return;
  403. //   cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
  404. }
  405. EXPORT_SYMBOL(drm_kms_helper_poll_disable);
  406.  
  407. /**
  408.  * drm_kms_helper_poll_enable - re-enable output polling.
  409.  * @dev: drm_device
  410.  *
  411.  * This function re-enables the output polling work.
  412.  *
  413.  * Drivers can call this helper from their device resume implementation. It is
  414.  * an error to call this when the output polling support has not yet been set
  415.  * up.
  416.  */
  417. void drm_kms_helper_poll_enable(struct drm_device *dev)
  418. {
  419.         mutex_lock(&dev->mode_config.mutex);
  420.         drm_kms_helper_poll_enable_locked(dev);
  421.         mutex_unlock(&dev->mode_config.mutex);
  422. }
  423. EXPORT_SYMBOL(drm_kms_helper_poll_enable);
  424.  
  425. /**
  426.  * drm_kms_helper_poll_init - initialize and enable output polling
  427.  * @dev: drm_device
  428.  *
  429.  * This function intializes and then also enables output polling support for
  430.  * @dev. Drivers which do not have reliable hotplug support in hardware can use
  431.  * this helper infrastructure to regularly poll such connectors for changes in
  432.  * their connection state.
  433.  *
  434.  * Drivers can control which connectors are polled by setting the
  435.  * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
  436.  * connectors where probing live outputs can result in visual distortion drivers
  437.  * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
  438.  * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
  439.  * completely ignored by the polling logic.
  440.  *
  441.  * Note that a connector can be both polled and probed from the hotplug handler,
  442.  * in case the hotplug interrupt is known to be unreliable.
  443.  */
  444. void drm_kms_helper_poll_init(struct drm_device *dev)
  445. {
  446.         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
  447.         dev->mode_config.poll_enabled = true;
  448.  
  449.         drm_kms_helper_poll_enable(dev);
  450. }
  451. EXPORT_SYMBOL(drm_kms_helper_poll_init);
  452.  
  453. /**
  454.  * drm_kms_helper_poll_fini - disable output polling and clean it up
  455.  * @dev: drm_device
  456.  */
  457. void drm_kms_helper_poll_fini(struct drm_device *dev)
  458. {
  459.         drm_kms_helper_poll_disable(dev);
  460. }
  461. EXPORT_SYMBOL(drm_kms_helper_poll_fini);
  462.  
  463. /**
  464.  * drm_helper_hpd_irq_event - hotplug processing
  465.  * @dev: drm_device
  466.  *
  467.  * Drivers can use this helper function to run a detect cycle on all connectors
  468.  * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
  469.  * other connectors are ignored, which is useful to avoid reprobing fixed
  470.  * panels.
  471.  *
  472.  * This helper function is useful for drivers which can't or don't track hotplug
  473.  * interrupts for each connector.
  474.  *
  475.  * Drivers which support hotplug interrupts for each connector individually and
  476.  * which have a more fine-grained detect logic should bypass this code and
  477.  * directly call drm_kms_helper_hotplug_event() in case the connector state
  478.  * changed.
  479.  *
  480.  * This function must be called from process context with no mode
  481.  * setting locks held.
  482.  *
  483.  * Note that a connector can be both polled and probed from the hotplug handler,
  484.  * in case the hotplug interrupt is known to be unreliable.
  485.  */
  486. bool drm_helper_hpd_irq_event(struct drm_device *dev)
  487. {
  488.         struct drm_connector *connector;
  489.         enum drm_connector_status old_status;
  490.         bool changed = false;
  491.  
  492.         if (!dev->mode_config.poll_enabled)
  493.                 return false;
  494.  
  495.         mutex_lock(&dev->mode_config.mutex);
  496.         drm_for_each_connector(connector, dev) {
  497.  
  498.                 /* Only handle HPD capable connectors. */
  499.                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
  500.                         continue;
  501.  
  502.                 old_status = connector->status;
  503.  
  504.                 connector->status = connector->funcs->detect(connector, false);
  505.                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
  506.                               connector->base.id,
  507.                               connector->name,
  508.                               drm_get_connector_status_name(old_status),
  509.                               drm_get_connector_status_name(connector->status));
  510.                 if (old_status != connector->status)
  511.                         changed = true;
  512.         }
  513.  
  514.         mutex_unlock(&dev->mode_config.mutex);
  515.  
  516.         if (changed)
  517.                 drm_kms_helper_hotplug_event(dev);
  518.  
  519.         return changed;
  520. }
  521. EXPORT_SYMBOL(drm_helper_hpd_irq_event);
  522.