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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 void drm_mode_validate_flag(struct drm_connector *connector,
  62.                                    int flags)
  63. {
  64.         struct drm_display_mode *mode;
  65.  
  66.         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
  67.                       DRM_MODE_FLAG_3D_MASK))
  68.                 return;
  69.  
  70.         list_for_each_entry(mode, &connector->modes, head) {
  71.                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  72.                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  73.                         mode->status = MODE_NO_INTERLACE;
  74.                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  75.                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  76.                         mode->status = MODE_NO_DBLESCAN;
  77.                 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
  78.                                 !(flags & DRM_MODE_FLAG_3D_MASK))
  79.                         mode->status = MODE_NO_STEREO;
  80.         }
  81.  
  82.         return;
  83. }
  84.  
  85. static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
  86.                                                               uint32_t maxX, uint32_t maxY, bool merge_type_bits)
  87. {
  88.         struct drm_device *dev = connector->dev;
  89.         struct drm_display_mode *mode;
  90.         struct drm_connector_helper_funcs *connector_funcs =
  91.                 connector->helper_private;
  92.         int count = 0;
  93.         int mode_flags = 0;
  94.         bool verbose_prune = true;
  95.  
  96.         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
  97.  
  98.         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
  99.                         connector->name);
  100.         /* set all modes to the unverified state */
  101.         list_for_each_entry(mode, &connector->modes, head)
  102.                 mode->status = MODE_UNVERIFIED;
  103.  
  104.         if (connector->force) {
  105.                 if (connector->force == DRM_FORCE_ON ||
  106.                     connector->force == DRM_FORCE_ON_DIGITAL)
  107.                         connector->status = connector_status_connected;
  108.                 else
  109.                         connector->status = connector_status_disconnected;
  110.                 if (connector->funcs->force)
  111.                         connector->funcs->force(connector);
  112.         } else {
  113.                 connector->status = connector->funcs->detect(connector, true);
  114.         }
  115.  
  116.         /* Re-enable polling in case the global poll config changed. */
  117.         if (drm_kms_helper_poll != dev->mode_config.poll_running)
  118.                 drm_kms_helper_poll_enable(dev);
  119.  
  120.         dev->mode_config.poll_running = drm_kms_helper_poll;
  121.  
  122.         if (connector->status == connector_status_disconnected) {
  123.                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
  124.                         connector->base.id, connector->name);
  125.                 drm_mode_connector_update_edid_property(connector, NULL);
  126.                 verbose_prune = false;
  127.                 goto prune;
  128.         }
  129.  
  130. #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
  131.         count = drm_load_edid_firmware(connector);
  132.         if (count == 0)
  133. #endif
  134.         {
  135.                 if (connector->override_edid) {
  136.                         struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
  137.  
  138.                         count = drm_add_edid_modes(connector, edid);
  139.                 } else
  140.                 count = (*connector_funcs->get_modes)(connector);
  141.         }
  142.  
  143.         if (count == 0 && connector->status == connector_status_connected)
  144.                 count = drm_add_modes_noedid(connector, 1024, 768);
  145.         if (count == 0)
  146.                 goto prune;
  147.  
  148.         drm_mode_connector_list_update(connector, merge_type_bits);
  149.  
  150.         if (maxX && maxY)
  151.                 drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
  152.  
  153.         if (connector->interlace_allowed)
  154.                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
  155.         if (connector->doublescan_allowed)
  156.                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
  157.         if (connector->stereo_allowed)
  158.                 mode_flags |= DRM_MODE_FLAG_3D_MASK;
  159.         drm_mode_validate_flag(connector, mode_flags);
  160.  
  161.         list_for_each_entry(mode, &connector->modes, head) {
  162.                 if (mode->status == MODE_OK && connector_funcs->mode_valid)
  163.                         mode->status = connector_funcs->mode_valid(connector,
  164.                                                                    mode);
  165.         }
  166.  
  167. prune:
  168.         drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
  169.  
  170.         if (list_empty(&connector->modes))
  171.                 return 0;
  172.  
  173.         list_for_each_entry(mode, &connector->modes, head)
  174.                 mode->vrefresh = drm_mode_vrefresh(mode);
  175.  
  176.         drm_mode_sort(&connector->modes);
  177.  
  178.         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
  179.                         connector->name);
  180.         list_for_each_entry(mode, &connector->modes, head) {
  181.                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  182.                 drm_mode_debug_printmodeline(mode);
  183.         }
  184.  
  185.         return count;
  186. }
  187.  
  188. /**
  189.  * drm_helper_probe_single_connector_modes - get complete set of display modes
  190.  * @connector: connector to probe
  191.  * @maxX: max width for modes
  192.  * @maxY: max height for modes
  193.  *
  194.  * Based on the helper callbacks implemented by @connector try to detect all
  195.  * valid modes.  Modes will first be added to the connector's probed_modes list,
  196.  * then culled (based on validity and the @maxX, @maxY parameters) and put into
  197.  * the normal modes list.
  198.  *
  199.  * Intended to be use as a generic implementation of the ->fill_modes()
  200.  * @connector vfunc for drivers that use the crtc helpers for output mode
  201.  * filtering and detection.
  202.  *
  203.  * Returns:
  204.  * The number of modes found on @connector.
  205.  */
  206. int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  207.                                             uint32_t maxX, uint32_t maxY)
  208. {
  209.         return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true);
  210. }
  211. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  212.  
  213. /**
  214.  * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes
  215.  * @connector: connector to probe
  216.  * @maxX: max width for modes
  217.  * @maxY: max height for modes
  218.  *
  219.  * This operates like drm_hehlper_probe_single_connector_modes except it
  220.  * replaces the mode bits instead of merging them for preferred modes.
  221.  */
  222. int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector,
  223.                                             uint32_t maxX, uint32_t maxY)
  224. {
  225.         return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false);
  226. }
  227. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge);
  228.  
  229. /**
  230.  * drm_kms_helper_hotplug_event - fire off KMS hotplug events
  231.  * @dev: drm_device whose connector state changed
  232.  *
  233.  * This function fires off the uevent for userspace and also calls the
  234.  * output_poll_changed function, which is most commonly used to inform the fbdev
  235.  * emulation code and allow it to update the fbcon output configuration.
  236.  *
  237.  * Drivers should call this from their hotplug handling code when a change is
  238.  * detected. Note that this function does not do any output detection of its
  239.  * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
  240.  * driver already.
  241.  *
  242.  * This function must be called from process context with no mode
  243.  * setting locks held.
  244.  */
  245. void drm_kms_helper_hotplug_event(struct drm_device *dev)
  246. {
  247.         /* send a uevent + call fbdev */
  248. //   drm_sysfs_hotplug_event(dev);
  249. //   if (dev->mode_config.funcs->output_poll_changed)
  250. //       dev->mode_config.funcs->output_poll_changed(dev);
  251. }
  252. EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
  253.  
  254. #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
  255. static void output_poll_execute(struct work_struct *work)
  256. {
  257.         struct delayed_work *delayed_work = to_delayed_work(work);
  258.         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
  259.         struct drm_connector *connector;
  260.         enum drm_connector_status old_status;
  261.         bool repoll = false, changed = false;
  262.  
  263.         if (!drm_kms_helper_poll)
  264.                 return;
  265.  
  266.         mutex_lock(&dev->mode_config.mutex);
  267.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  268.  
  269.                 /* Ignore forced connectors. */
  270.                 if (connector->force)
  271.                         continue;
  272.  
  273.                 /* Ignore HPD capable connectors and connectors where we don't
  274.                  * want any hotplug detection at all for polling. */
  275.                 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
  276.                         continue;
  277.  
  278.                 repoll = true;
  279.  
  280.                 old_status = connector->status;
  281.                 /* if we are connected and don't want to poll for disconnect
  282.                    skip it */
  283.                 if (old_status == connector_status_connected &&
  284.                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
  285.                         continue;
  286.  
  287.                 connector->status = connector->funcs->detect(connector, false);
  288.                 if (old_status != connector->status) {
  289.                         const char *old, *new;
  290.  
  291.                         old = drm_get_connector_status_name(old_status);
  292.                         new = drm_get_connector_status_name(connector->status);
  293.  
  294.                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
  295.                                       "status updated from %s to %s\n",
  296.                                       connector->base.id,
  297.                                       connector->name,
  298.                                       old, new);
  299.  
  300.                         changed = true;
  301.                 }
  302.         }
  303.  
  304.         mutex_unlock(&dev->mode_config.mutex);
  305.  
  306. //   if (changed)
  307. //       drm_kms_helper_hotplug_event(dev);
  308.  
  309. //   if (repoll)
  310. //       schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
  311. }
  312.  
  313. /**
  314.  * drm_kms_helper_poll_disable - disable output polling
  315.  * @dev: drm_device
  316.  *
  317.  * This function disables the output polling work.
  318.  *
  319.  * Drivers can call this helper from their device suspend implementation. It is
  320.  * not an error to call this even when output polling isn't enabled or arlready
  321.  * disabled.
  322.  */
  323. void drm_kms_helper_poll_disable(struct drm_device *dev)
  324. {
  325.         if (!dev->mode_config.poll_enabled)
  326.                 return;
  327. //   cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
  328. }
  329. EXPORT_SYMBOL(drm_kms_helper_poll_disable);
  330.  
  331. /**
  332.  * drm_kms_helper_poll_enable - re-enable output polling.
  333.  * @dev: drm_device
  334.  *
  335.  * This function re-enables the output polling work.
  336.  *
  337.  * Drivers can call this helper from their device resume implementation. It is
  338.  * an error to call this when the output polling support has not yet been set
  339.  * up.
  340.  */
  341. void drm_kms_helper_poll_enable(struct drm_device *dev)
  342. {
  343.         bool poll = false;
  344.         struct drm_connector *connector;
  345.  
  346.         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
  347.                 return;
  348.  
  349.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  350.                 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
  351.                                          DRM_CONNECTOR_POLL_DISCONNECT))
  352.                         poll = true;
  353.         }
  354.  
  355. //   if (poll)
  356. //       schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
  357. }
  358. EXPORT_SYMBOL(drm_kms_helper_poll_enable);
  359.  
  360. /**
  361.  * drm_kms_helper_poll_init - initialize and enable output polling
  362.  * @dev: drm_device
  363.  *
  364.  * This function intializes and then also enables output polling support for
  365.  * @dev. Drivers which do not have reliable hotplug support in hardware can use
  366.  * this helper infrastructure to regularly poll such connectors for changes in
  367.  * their connection state.
  368.  *
  369.  * Drivers can control which connectors are polled by setting the
  370.  * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
  371.  * connectors where probing live outputs can result in visual distortion drivers
  372.  * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
  373.  * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
  374.  * completely ignored by the polling logic.
  375.  *
  376.  * Note that a connector can be both polled and probed from the hotplug handler,
  377.  * in case the hotplug interrupt is known to be unreliable.
  378.  */
  379. void drm_kms_helper_poll_init(struct drm_device *dev)
  380. {
  381.         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
  382.         dev->mode_config.poll_enabled = true;
  383.  
  384.         drm_kms_helper_poll_enable(dev);
  385. }
  386. EXPORT_SYMBOL(drm_kms_helper_poll_init);
  387.  
  388. /**
  389.  * drm_kms_helper_poll_fini - disable output polling and clean it up
  390.  * @dev: drm_device
  391.  */
  392. void drm_kms_helper_poll_fini(struct drm_device *dev)
  393. {
  394.         drm_kms_helper_poll_disable(dev);
  395. }
  396. EXPORT_SYMBOL(drm_kms_helper_poll_fini);
  397.  
  398. /**
  399.  * drm_helper_hpd_irq_event - hotplug processing
  400.  * @dev: drm_device
  401.  *
  402.  * Drivers can use this helper function to run a detect cycle on all connectors
  403.  * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
  404.  * other connectors are ignored, which is useful to avoid reprobing fixed
  405.  * panels.
  406.  *
  407.  * This helper function is useful for drivers which can't or don't track hotplug
  408.  * interrupts for each connector.
  409.  *
  410.  * Drivers which support hotplug interrupts for each connector individually and
  411.  * which have a more fine-grained detect logic should bypass this code and
  412.  * directly call drm_kms_helper_hotplug_event() in case the connector state
  413.  * changed.
  414.  *
  415.  * This function must be called from process context with no mode
  416.  * setting locks held.
  417.  *
  418.  * Note that a connector can be both polled and probed from the hotplug handler,
  419.  * in case the hotplug interrupt is known to be unreliable.
  420.  */
  421. bool drm_helper_hpd_irq_event(struct drm_device *dev)
  422. {
  423.         struct drm_connector *connector;
  424.         enum drm_connector_status old_status;
  425.         bool changed = false;
  426.  
  427.         if (!dev->mode_config.poll_enabled)
  428.                 return false;
  429.  
  430.         mutex_lock(&dev->mode_config.mutex);
  431.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  432.  
  433.                 /* Only handle HPD capable connectors. */
  434.                 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
  435.                         continue;
  436.  
  437.                 old_status = connector->status;
  438.  
  439.                 connector->status = connector->funcs->detect(connector, false);
  440.                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
  441.                               connector->base.id,
  442.                               connector->name,
  443.                               drm_get_connector_status_name(old_status),
  444.                               drm_get_connector_status_name(connector->status));
  445.                 if (old_status != connector->status)
  446.                         changed = true;
  447.         }
  448.  
  449.         mutex_unlock(&dev->mode_config.mutex);
  450.  
  451.         if (changed)
  452.                 drm_kms_helper_hotplug_event(dev);
  453.  
  454.         return changed;
  455. }
  456. EXPORT_SYMBOL(drm_helper_hpd_irq_event);
  457.