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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 "drmP.h"
  33. #include "drm_crtc.h"
  34. #include "drm_crtc_helper.h"
  35.  
  36. /*
  37.  * Detailed mode info for 800x600@60Hz
  38.  */
  39. static struct drm_display_mode std_modes[] = {
  40.         { DRM_MODE("800x600", DRM_MODE_TYPE_DEFAULT, 40000, 800, 840,
  41.                    968, 1056, 0, 600, 601, 605, 628, 0,
  42.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
  43. };
  44.  
  45. static void drm_mode_validate_flag(struct drm_connector *connector,
  46.                                    int flags)
  47. {
  48.         struct drm_display_mode *mode, *t;
  49.  
  50.         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  51.                 return;
  52.  
  53.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  54.                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  55.                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  56.                         mode->status = MODE_NO_INTERLACE;
  57.                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  58.                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  59.                         mode->status = MODE_NO_DBLESCAN;
  60.         }
  61.  
  62.         return;
  63. }
  64.  
  65. /**
  66.  * drm_helper_probe_connector_modes - get complete set of display modes
  67.  * @dev: DRM device
  68.  * @maxX: max width for modes
  69.  * @maxY: max height for modes
  70.  *
  71.  * LOCKING:
  72.  * Caller must hold mode config lock.
  73.  *
  74.  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  75.  * modes on them.  Modes will first be added to the connector's probed_modes
  76.  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  77.  * put into the normal modes list.
  78.  *
  79.  * Intended to be used either at bootup time or when major configuration
  80.  * changes have occurred.
  81.  *
  82.  * FIXME: take into account monitor limits
  83.  *
  84.  * RETURNS:
  85.  * Number of modes found on @connector.
  86.  */
  87. int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  88.                                             uint32_t maxX, uint32_t maxY)
  89. {
  90.         struct drm_device *dev = connector->dev;
  91.         struct drm_display_mode *mode, *t;
  92.         struct drm_connector_helper_funcs *connector_funcs =
  93.                 connector->helper_private;
  94.         int count = 0;
  95.         int mode_flags = 0;
  96.  
  97.         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
  98.         /* set all modes to the unverified state */
  99.         list_for_each_entry_safe(mode, t, &connector->modes, head)
  100.                 mode->status = MODE_UNVERIFIED;
  101.  
  102.         connector->status = connector->funcs->detect(connector);
  103.  
  104.         if (connector->status == connector_status_disconnected) {
  105.                 DRM_DEBUG("%s is disconnected\n",
  106.                           drm_get_connector_name(connector));
  107.                 /* TODO set EDID to NULL */
  108.                 return 0;
  109.         }
  110.  
  111.         count = (*connector_funcs->get_modes)(connector);
  112.         if (!count)
  113.                 return 0;
  114.  
  115.         drm_mode_connector_list_update(connector);
  116.  
  117.         if (maxX && maxY)
  118.                 drm_mode_validate_size(dev, &connector->modes, maxX,
  119.                                        maxY, 0);
  120.  
  121.         if (connector->interlace_allowed)
  122.                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
  123.         if (connector->doublescan_allowed)
  124.                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
  125.         drm_mode_validate_flag(connector, mode_flags);
  126.  
  127.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  128.                 if (mode->status == MODE_OK)
  129.                         mode->status = connector_funcs->mode_valid(connector,
  130.                                                                    mode);
  131.         }
  132.  
  133.  
  134.         drm_mode_prune_invalid(dev, &connector->modes, true);
  135.  
  136.         if (list_empty(&connector->modes))
  137.                 return 0;
  138.  
  139.         drm_mode_sort(&connector->modes);
  140.  
  141.         DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
  142.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  143.                 mode->vrefresh = drm_mode_vrefresh(mode);
  144.  
  145.                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  146.                 drm_mode_debug_printmodeline(mode);
  147.         }
  148.  
  149.         return count;
  150. }
  151. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  152.  
  153. int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
  154.                                       uint32_t maxY)
  155. {
  156.         struct drm_connector *connector;
  157.         int count = 0;
  158.  
  159.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  160.                 count += drm_helper_probe_single_connector_modes(connector,
  161.                                                                  maxX, maxY);
  162.         }
  163.  
  164.         return count;
  165. }
  166. EXPORT_SYMBOL(drm_helper_probe_connector_modes);
  167.  
  168. static void drm_helper_add_std_modes(struct drm_device *dev,
  169.                                      struct drm_connector *connector)
  170. {
  171.         struct drm_display_mode *mode, *t;
  172.         int i;
  173.  
  174.         for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
  175.                 struct drm_display_mode *stdmode;
  176.  
  177.                 /*
  178.                  * When no valid EDID modes are available we end up
  179.                  * here and bailed in the past, now we add some standard
  180.                  * modes and move on.
  181.                  */
  182.                 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
  183.                 drm_mode_probed_add(connector, stdmode);
  184.                 drm_mode_list_concat(&connector->probed_modes,
  185.                                      &connector->modes);
  186.  
  187.                 DRM_DEBUG("Adding mode %s to %s\n", stdmode->name,
  188.                           drm_get_connector_name(connector));
  189.         }
  190.         drm_mode_sort(&connector->modes);
  191.  
  192.         DRM_DEBUG("Added std modes on %s\n", drm_get_connector_name(connector));
  193.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  194.                 mode->vrefresh = drm_mode_vrefresh(mode);
  195.  
  196.                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  197.                 drm_mode_debug_printmodeline(mode);
  198.         }
  199. }
  200.  
  201. /**
  202.  * drm_helper_encoder_in_use - check if a given encoder is in use
  203.  * @encoder: encoder to check
  204.  *
  205.  * LOCKING:
  206.  * Caller must hold mode config lock.
  207.  *
  208.  * Walk @encoders's DRM device's mode_config and see if it's in use.
  209.  *
  210.  * RETURNS:
  211.  * True if @encoder is part of the mode_config, false otherwise.
  212.  */
  213. bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
  214. {
  215.         struct drm_connector *connector;
  216.         struct drm_device *dev = encoder->dev;
  217.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  218.                 if (connector->encoder == encoder)
  219.                         return true;
  220.         return false;
  221. }
  222. EXPORT_SYMBOL(drm_helper_encoder_in_use);
  223.  
  224. /**
  225.  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
  226.  * @crtc: CRTC to check
  227.  *
  228.  * LOCKING:
  229.  * Caller must hold mode config lock.
  230.  *
  231.  * Walk @crtc's DRM device's mode_config and see if it's in use.
  232.  *
  233.  * RETURNS:
  234.  * True if @crtc is part of the mode_config, false otherwise.
  235.  */
  236. bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
  237. {
  238.         struct drm_encoder *encoder;
  239.         struct drm_device *dev = crtc->dev;
  240.         /* FIXME: Locking around list access? */
  241.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
  242.                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
  243.                         return true;
  244.         return false;
  245. }
  246. EXPORT_SYMBOL(drm_helper_crtc_in_use);
  247.  
  248. /**
  249.  * drm_disable_unused_functions - disable unused objects
  250.  * @dev: DRM device
  251.  *
  252.  * LOCKING:
  253.  * Caller must hold mode config lock.
  254.  *
  255.  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
  256.  * by calling its dpms function, which should power it off.
  257.  */
  258. void drm_helper_disable_unused_functions(struct drm_device *dev)
  259. {
  260.         struct drm_encoder *encoder;
  261.         struct drm_encoder_helper_funcs *encoder_funcs;
  262.         struct drm_crtc *crtc;
  263.  
  264.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  265.                 encoder_funcs = encoder->helper_private;
  266.                 if (!drm_helper_encoder_in_use(encoder))
  267.                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  268.         }
  269.  
  270.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  271.                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  272.                 crtc->enabled = drm_helper_crtc_in_use(crtc);
  273.                 if (!crtc->enabled) {
  274.                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
  275.                         crtc->fb = NULL;
  276.                 }
  277.         }
  278. }
  279. EXPORT_SYMBOL(drm_helper_disable_unused_functions);
  280.  
  281. static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
  282. {
  283.         struct drm_display_mode *mode;
  284.  
  285.         list_for_each_entry(mode, &connector->modes, head) {
  286.                 if (drm_mode_width(mode) > width ||
  287.                     drm_mode_height(mode) > height)
  288.                         continue;
  289.                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
  290.                         return mode;
  291.         }
  292.         return NULL;
  293. }
  294.  
  295. static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
  296. {
  297.         bool enable;
  298.  
  299.         if (strict) {
  300.                 enable = connector->status == connector_status_connected;
  301.         } else {
  302.                 enable = connector->status != connector_status_disconnected;
  303.         }
  304.         return enable;
  305. }
  306.  
  307. static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
  308. {
  309.         bool any_enabled = false;
  310.         struct drm_connector *connector;
  311.         int i = 0;
  312.  
  313.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  314.                 enabled[i] = drm_connector_enabled(connector, true);
  315.                 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
  316.                           enabled[i] ? "yes" : "no");
  317.                 any_enabled |= enabled[i];
  318.                 i++;
  319.         }
  320.  
  321.         if (any_enabled)
  322.                 return;
  323.  
  324.         i = 0;
  325.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  326.                 enabled[i] = drm_connector_enabled(connector, false);
  327.                 i++;
  328.         }
  329. }
  330.  
  331. static bool drm_target_preferred(struct drm_device *dev,
  332.                                  struct drm_display_mode **modes,
  333.                                  bool *enabled, int width, int height)
  334. {
  335.         struct drm_connector *connector;
  336.         int i = 0;
  337.  
  338.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  339.  
  340.                 if (enabled[i] == false) {
  341.                         i++;
  342.                         continue;
  343.                 }
  344.  
  345.                 DRM_DEBUG("looking for preferred mode on connector %d\n",
  346.                           connector->base.id);
  347.  
  348.                 modes[i] = drm_has_preferred_mode(connector, width, height);
  349.                 /* No preferred modes, pick one off the list */
  350.                 if (!modes[i] && !list_empty(&connector->modes)) {
  351.                         list_for_each_entry(modes[i], &connector->modes, head)
  352.                                 break;
  353.                 }
  354.                 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
  355.                           "none");
  356.                 i++;
  357.         }
  358.         return true;
  359. }
  360.  
  361. static int drm_pick_crtcs(struct drm_device *dev,
  362.                           struct drm_crtc **best_crtcs,
  363.                           struct drm_display_mode **modes,
  364.                           int n, int width, int height)
  365. {
  366.         int c, o;
  367.         struct drm_connector *connector;
  368.         struct drm_connector_helper_funcs *connector_funcs;
  369.         struct drm_encoder *encoder;
  370.         struct drm_crtc *best_crtc;
  371.         int my_score, best_score, score;
  372.         struct drm_crtc **crtcs, *crtc;
  373.  
  374.         if (n == dev->mode_config.num_connector)
  375.                 return 0;
  376.         c = 0;
  377.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  378.                 if (c == n)
  379.                         break;
  380.                 c++;
  381.         }
  382.  
  383.         best_crtcs[n] = NULL;
  384.         best_crtc = NULL;
  385.         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
  386.         if (modes[n] == NULL)
  387.                 return best_score;
  388.  
  389.         crtcs = kmalloc(dev->mode_config.num_connector *
  390.                         sizeof(struct drm_crtc *), GFP_KERNEL);
  391.         if (!crtcs)
  392.                 return best_score;
  393.  
  394.         my_score = 1;
  395.         if (connector->status == connector_status_connected)
  396.                 my_score++;
  397.         if (drm_has_preferred_mode(connector, width, height))
  398.                 my_score++;
  399.  
  400.         connector_funcs = connector->helper_private;
  401.         encoder = connector_funcs->best_encoder(connector);
  402.         if (!encoder)
  403.                 goto out;
  404.  
  405.         connector->encoder = encoder;
  406.  
  407.         /* select a crtc for this connector and then attempt to configure
  408.            remaining connectors */
  409.         c = 0;
  410.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  411.  
  412.                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
  413.                         c++;
  414.                         continue;
  415.                 }
  416.  
  417.                 for (o = 0; o < n; o++)
  418.                         if (best_crtcs[o] == crtc)
  419.                                 break;
  420.  
  421.                 if (o < n) {
  422.                         /* ignore cloning for now */
  423.                         c++;
  424.                         continue;
  425.                 }
  426.  
  427.                 crtcs[n] = crtc;
  428.                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
  429.                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
  430.                                                   width, height);
  431.                 if (score > best_score) {
  432.                         best_crtc = crtc;
  433.                         best_score = score;
  434.                         memcpy(best_crtcs, crtcs,
  435.                                dev->mode_config.num_connector *
  436.                                sizeof(struct drm_crtc *));
  437.                 }
  438.                 c++;
  439.         }
  440. out:
  441.         kfree(crtcs);
  442.         return best_score;
  443. }
  444.  
  445. static void drm_setup_crtcs(struct drm_device *dev)
  446. {
  447.         struct drm_crtc **crtcs;
  448.         struct drm_display_mode **modes;
  449.         struct drm_encoder *encoder;
  450.         struct drm_connector *connector;
  451.         bool *enabled;
  452.         int width, height;
  453.         int i, ret;
  454.  
  455.         DRM_DEBUG("\n");
  456.  
  457.         width = dev->mode_config.max_width;
  458.         height = dev->mode_config.max_height;
  459.  
  460.         /* clean out all the encoder/crtc combos */
  461.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  462.                 encoder->crtc = NULL;
  463.         }
  464.  
  465.         crtcs = kcalloc(dev->mode_config.num_connector,
  466.                         sizeof(struct drm_crtc *), GFP_KERNEL);
  467.         modes = kcalloc(dev->mode_config.num_connector,
  468.                         sizeof(struct drm_display_mode *), GFP_KERNEL);
  469.         enabled = kcalloc(dev->mode_config.num_connector,
  470.                           sizeof(bool), GFP_KERNEL);
  471.  
  472.         drm_enable_connectors(dev, enabled);
  473.  
  474.         ret = drm_target_preferred(dev, modes, enabled, width, height);
  475.         if (!ret)
  476.                 DRM_ERROR("Unable to find initial modes\n");
  477.  
  478.         DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
  479.  
  480.         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
  481.  
  482.     dbgprintf("done\n");
  483.  
  484.         i = 0;
  485.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  486.                 struct drm_display_mode *mode = modes[i];
  487.                 struct drm_crtc *crtc = crtcs[i];
  488.  
  489.                 if (connector->encoder == NULL) {
  490.                         i++;
  491.                         continue;
  492.                 }
  493.  
  494.                 if (mode && crtc) {
  495.                         DRM_DEBUG("desired mode %s set on crtc %d\n",
  496.                                   mode->name, crtc->base.id);
  497.                         crtc->desired_mode = mode;
  498.                         connector->encoder->crtc = crtc;
  499.                 } else
  500.                         connector->encoder->crtc = NULL;
  501.                 i++;
  502.         }
  503.  
  504.         kfree(crtcs);
  505.         kfree(modes);
  506.         kfree(enabled);
  507.  
  508.     LEAVE();
  509. }
  510.  
  511. /**
  512.  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
  513.  * @encoder: encoder to test
  514.  * @crtc: crtc to test
  515.  *
  516.  * Return false if @encoder can't be driven by @crtc, true otherwise.
  517.  */
  518. static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
  519.                                 struct drm_crtc *crtc)
  520. {
  521.         struct drm_device *dev;
  522.         struct drm_crtc *tmp;
  523.         int crtc_mask = 1;
  524.  
  525. //   WARN(!crtc, "checking null crtc?");
  526.  
  527.         dev = crtc->dev;
  528.  
  529.         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
  530.                 if (tmp == crtc)
  531.                         break;
  532.                 crtc_mask <<= 1;
  533.         }
  534.  
  535.         if (encoder->possible_crtcs & crtc_mask)
  536.                 return true;
  537.         return false;
  538. }
  539.  
  540. /*
  541.  * Check the CRTC we're going to map each output to vs. its current
  542.  * CRTC.  If they don't match, we have to disable the output and the CRTC
  543.  * since the driver will have to re-route things.
  544.  */
  545. static void
  546. drm_crtc_prepare_encoders(struct drm_device *dev)
  547. {
  548.         struct drm_encoder_helper_funcs *encoder_funcs;
  549.         struct drm_encoder *encoder;
  550.  
  551.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  552.                 encoder_funcs = encoder->helper_private;
  553.                 /* Disable unused encoders */
  554.                 if (encoder->crtc == NULL)
  555.                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  556.                 /* Disable encoders whose CRTC is about to change */
  557.                 if (encoder_funcs->get_crtc &&
  558.                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
  559.                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  560.         }
  561. }
  562.  
  563. /**
  564.  * drm_crtc_set_mode - set a mode
  565.  * @crtc: CRTC to program
  566.  * @mode: mode to use
  567.  * @x: width of mode
  568.  * @y: height of mode
  569.  *
  570.  * LOCKING:
  571.  * Caller must hold mode config lock.
  572.  *
  573.  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
  574.  * to fixup or reject the mode prior to trying to set it.
  575.  *
  576.  * RETURNS:
  577.  * True if the mode was set successfully, or false otherwise.
  578.  */
  579. bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
  580.                               struct drm_display_mode *mode,
  581.                               int x, int y,
  582.                               struct drm_framebuffer *old_fb)
  583. {
  584.         struct drm_device *dev = crtc->dev;
  585.         struct drm_display_mode *adjusted_mode, saved_mode;
  586.         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  587.         struct drm_encoder_helper_funcs *encoder_funcs;
  588.         int saved_x, saved_y;
  589.         struct drm_encoder *encoder;
  590.         bool ret = true;
  591.  
  592.         adjusted_mode = drm_mode_duplicate(dev, mode);
  593.  
  594.         crtc->enabled = drm_helper_crtc_in_use(crtc);
  595.  
  596.         if (!crtc->enabled)
  597.                 return true;
  598.  
  599.         saved_mode = crtc->mode;
  600.         saved_x = crtc->x;
  601.         saved_y = crtc->y;
  602.  
  603.         /* Update crtc values up front so the driver can rely on them for mode
  604.          * setting.
  605.          */
  606.         crtc->mode = *mode;
  607.         crtc->x = x;
  608.         crtc->y = y;
  609.  
  610.         /* Pass our mode to the connectors and the CRTC to give them a chance to
  611.          * adjust it according to limitations or connector properties, and also
  612.          * a chance to reject the mode entirely.
  613.          */
  614.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  615.  
  616.                 if (encoder->crtc != crtc)
  617.                         continue;
  618.                 encoder_funcs = encoder->helper_private;
  619.                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
  620.                                                       adjusted_mode))) {
  621.                         goto done;
  622.                 }
  623.         }
  624.  
  625.         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
  626.                 goto done;
  627.         }
  628.  
  629.         /* Prepare the encoders and CRTCs before setting the mode. */
  630.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  631.  
  632.                 if (encoder->crtc != crtc)
  633.                         continue;
  634.                 encoder_funcs = encoder->helper_private;
  635.                 /* Disable the encoders as the first thing we do. */
  636.                 encoder_funcs->prepare(encoder);
  637.         }
  638.  
  639.         drm_crtc_prepare_encoders(dev);
  640.  
  641.         crtc_funcs->prepare(crtc);
  642.  
  643.         /* Set up the DPLL and any encoders state that needs to adjust or depend
  644.          * on the DPLL.
  645.          */
  646.         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
  647.         if (!ret)
  648.             goto done;
  649.  
  650.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  651.  
  652.                 if (encoder->crtc != crtc)
  653.                         continue;
  654.  
  655.                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
  656.                          mode->name, mode->base.id);
  657.                 encoder_funcs = encoder->helper_private;
  658.                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
  659.         }
  660.  
  661.         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
  662.         crtc_funcs->commit(crtc);
  663.  
  664.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  665.  
  666.                 if (encoder->crtc != crtc)
  667.                         continue;
  668.  
  669.                 encoder_funcs = encoder->helper_private;
  670.                 encoder_funcs->commit(encoder);
  671.  
  672.         }
  673.  
  674.         /* XXX free adjustedmode */
  675.         drm_mode_destroy(dev, adjusted_mode);
  676.         /* FIXME: add subpixel order */
  677. done:
  678.         if (!ret) {
  679.                 crtc->mode = saved_mode;
  680.                 crtc->x = saved_x;
  681.                 crtc->y = saved_y;
  682.         }
  683.  
  684.         return ret;
  685. }
  686. EXPORT_SYMBOL(drm_crtc_helper_set_mode);
  687.  
  688.  
  689. /**
  690.  * drm_crtc_helper_set_config - set a new config from userspace
  691.  * @crtc: CRTC to setup
  692.  * @crtc_info: user provided configuration
  693.  * @new_mode: new mode to set
  694.  * @connector_set: set of connectors for the new config
  695.  * @fb: new framebuffer
  696.  *
  697.  * LOCKING:
  698.  * Caller must hold mode config lock.
  699.  *
  700.  * Setup a new configuration, provided by the user in @crtc_info, and enable
  701.  * it.
  702.  *
  703.  * RETURNS:
  704.  * Zero. (FIXME)
  705.  */
  706. int drm_crtc_helper_set_config(struct drm_mode_set *set)
  707. {
  708.         struct drm_device *dev;
  709.         struct drm_crtc **save_crtcs, *new_crtc;
  710.         struct drm_encoder **save_encoders, *new_encoder;
  711.         struct drm_framebuffer *old_fb = NULL;
  712.         bool save_enabled;
  713.         bool mode_changed = false;
  714.         bool fb_changed = false;
  715.         struct drm_connector *connector;
  716.         int count = 0, ro, fail = 0;
  717.         struct drm_crtc_helper_funcs *crtc_funcs;
  718.         int ret = 0;
  719.  
  720.         DRM_DEBUG("\n");
  721.  
  722.         if (!set)
  723.                 return -EINVAL;
  724.  
  725.         if (!set->crtc)
  726.                 return -EINVAL;
  727.  
  728.         if (!set->crtc->helper_private)
  729.                 return -EINVAL;
  730.  
  731.         crtc_funcs = set->crtc->helper_private;
  732.  
  733.         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
  734.                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
  735.                   (int)set->num_connectors, set->x, set->y);
  736.  
  737.         dev = set->crtc->dev;
  738.  
  739.         /* save previous config */
  740.         save_enabled = set->crtc->enabled;
  741.  
  742.         /*
  743.          * We do mode_config.num_connectors here since we'll look at the
  744.          * CRTC and encoder associated with each connector later.
  745.          */
  746.         save_crtcs = kzalloc(dev->mode_config.num_connector *
  747.                              sizeof(struct drm_crtc *), GFP_KERNEL);
  748.         if (!save_crtcs)
  749.                 return -ENOMEM;
  750.  
  751.         save_encoders = kzalloc(dev->mode_config.num_connector *
  752.                                 sizeof(struct drm_encoders *), GFP_KERNEL);
  753.         if (!save_encoders) {
  754.                 kfree(save_crtcs);
  755.                 return -ENOMEM;
  756.         }
  757.  
  758.         /* We should be able to check here if the fb has the same properties
  759.          * and then just flip_or_move it */
  760.         if (set->crtc->fb != set->fb) {
  761.                 /* If we have no fb then treat it as a full mode set */
  762.                 if (set->crtc->fb == NULL) {
  763.                         DRM_DEBUG("crtc has no fb, full mode set\n");
  764.                         mode_changed = true;
  765.                 } else if ((set->fb->bits_per_pixel !=
  766.                          set->crtc->fb->bits_per_pixel) ||
  767.                          set->fb->depth != set->crtc->fb->depth)
  768.                         fb_changed = true;
  769.                 else
  770.                         fb_changed = true;
  771.         }
  772.  
  773.         if (set->x != set->crtc->x || set->y != set->crtc->y)
  774.                 fb_changed = true;
  775.  
  776.         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
  777.                 DRM_DEBUG("modes are different, full mode set\n");
  778.                 drm_mode_debug_printmodeline(&set->crtc->mode);
  779.                 drm_mode_debug_printmodeline(set->mode);
  780.                 mode_changed = true;
  781.         }
  782.  
  783.         /* a) traverse passed in connector list and get encoders for them */
  784.         count = 0;
  785.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  786.                 struct drm_connector_helper_funcs *connector_funcs =
  787.                         connector->helper_private;
  788.                 save_encoders[count++] = connector->encoder;
  789.                 new_encoder = connector->encoder;
  790.                 for (ro = 0; ro < set->num_connectors; ro++) {
  791.                         if (set->connectors[ro] == connector) {
  792.                                 new_encoder = connector_funcs->best_encoder(connector);
  793.                                 /* if we can't get an encoder for a connector
  794.                                    we are setting now - then fail */
  795.                                 if (new_encoder == NULL)
  796.                                         /* don't break so fail path works correct */
  797.                                         fail = 1;
  798.                                 break;
  799.                         }
  800.                 }
  801.  
  802.                 if (new_encoder != connector->encoder) {
  803.                         DRM_DEBUG("encoder changed, full mode switch\n");
  804.                         mode_changed = true;
  805.                         connector->encoder = new_encoder;
  806.                 }
  807.         }
  808.  
  809.         if (fail) {
  810.                 ret = -EINVAL;
  811.                 goto fail_no_encoder;
  812.         }
  813.  
  814.         count = 0;
  815.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  816.                 if (!connector->encoder)
  817.                         continue;
  818.  
  819.                 save_crtcs[count++] = connector->encoder->crtc;
  820.  
  821.                 if (connector->encoder->crtc == set->crtc)
  822.                         new_crtc = NULL;
  823.                 else
  824.                         new_crtc = connector->encoder->crtc;
  825.  
  826.                 for (ro = 0; ro < set->num_connectors; ro++) {
  827.                         if (set->connectors[ro] == connector)
  828.                                 new_crtc = set->crtc;
  829.                 }
  830.  
  831.                 /* Make sure the new CRTC will work with the encoder */
  832.                 if (new_crtc &&
  833.                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
  834.                         ret = -EINVAL;
  835.                         goto fail_set_mode;
  836.                 }
  837.                 if (new_crtc != connector->encoder->crtc) {
  838.                         DRM_DEBUG("crtc changed, full mode switch\n");
  839.                         mode_changed = true;
  840.                         connector->encoder->crtc = new_crtc;
  841.                 }
  842.                 DRM_DEBUG("setting connector %d crtc to %p\n",
  843.                           connector->base.id, new_crtc);
  844.         }
  845.  
  846.         /* mode_set_base is not a required function */
  847.         if (fb_changed && !crtc_funcs->mode_set_base)
  848.                 mode_changed = true;
  849.  
  850.         if (mode_changed) {
  851.                 old_fb = set->crtc->fb;
  852.                 set->crtc->fb = set->fb;
  853.                 set->crtc->enabled = (set->mode != NULL);
  854.                 if (set->mode != NULL) {
  855.                         DRM_DEBUG("attempting to set mode from userspace\n");
  856.                         drm_mode_debug_printmodeline(set->mode);
  857.                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
  858.                                                       set->x, set->y,
  859.                                                       old_fb)) {
  860.                                 DRM_ERROR("failed to set mode on crtc %p\n",
  861.                                           set->crtc);
  862.                                 ret = -EINVAL;
  863.                                 goto fail_set_mode;
  864.                         }
  865.                         /* TODO are these needed? */
  866.                         set->crtc->desired_x = set->x;
  867.                         set->crtc->desired_y = set->y;
  868.                         set->crtc->desired_mode = set->mode;
  869.                 }
  870.                 drm_helper_disable_unused_functions(dev);
  871.         } else if (fb_changed) {
  872.                 old_fb = set->crtc->fb;
  873.                 if (set->crtc->fb != set->fb)
  874.                         set->crtc->fb = set->fb;
  875.                 ret = crtc_funcs->mode_set_base(set->crtc,
  876.                                                 set->x, set->y, old_fb);
  877.                 if (ret != 0)
  878.                     goto fail_set_mode;
  879.         }
  880.  
  881.         kfree(save_encoders);
  882.         kfree(save_crtcs);
  883.         return 0;
  884.  
  885. fail_set_mode:
  886.         set->crtc->enabled = save_enabled;
  887.         set->crtc->fb = old_fb;
  888.         count = 0;
  889.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  890.                 if (!connector->encoder)
  891.                         continue;
  892.  
  893.                 connector->encoder->crtc = save_crtcs[count++];
  894.         }
  895. fail_no_encoder:
  896.         kfree(save_crtcs);
  897.         count = 0;
  898.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  899.                 connector->encoder = save_encoders[count++];
  900.         }
  901.         kfree(save_encoders);
  902.         return ret;
  903. }
  904. EXPORT_SYMBOL(drm_crtc_helper_set_config);
  905.  
  906. bool drm_helper_plugged_event(struct drm_device *dev)
  907. {
  908.         DRM_DEBUG("\n");
  909.  
  910.         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
  911.                                          dev->mode_config.max_height);
  912.  
  913.         drm_setup_crtcs(dev);
  914.  
  915.         /* alert the driver fb layer */
  916.  //  dev->mode_config.funcs->fb_changed(dev);
  917.  
  918.         /* FIXME: send hotplug event */
  919.         return true;
  920. }
  921. /**
  922.  * drm_initial_config - setup a sane initial connector configuration
  923.  * @dev: DRM device
  924.  *
  925.  * LOCKING:
  926.  * Called at init time, must take mode config lock.
  927.  *
  928.  * Scan the CRTCs and connectors and try to put together an initial setup.
  929.  * At the moment, this is a cloned configuration across all heads with
  930.  * a new framebuffer object as the backing store.
  931.  *
  932.  * RETURNS:
  933.  * Zero if everything went ok, nonzero otherwise.
  934.  */
  935. bool drm_helper_initial_config(struct drm_device *dev)
  936. {
  937.         struct drm_connector *connector;
  938.         int count = 0;
  939.  
  940.     ENTRY();
  941.  
  942.         count = drm_helper_probe_connector_modes(dev,
  943.                                                  dev->mode_config.max_width,
  944.                                                  dev->mode_config.max_height);
  945.  
  946.         /*
  947.          * None of the available connectors had any modes, so add some
  948.          * and try to light them up anyway
  949.          */
  950.         if (!count) {
  951.                 DRM_ERROR("connectors have no modes, using standard modes\n");
  952.                 list_for_each_entry(connector,
  953.                                     &dev->mode_config.connector_list,
  954.                                     head)
  955.                         drm_helper_add_std_modes(dev, connector);
  956.         }
  957.  
  958.         drm_setup_crtcs(dev);
  959.  
  960.         /* alert the driver fb layer */
  961.  //  dev->mode_config.funcs->fb_changed(dev);
  962.  
  963.     LEAVE();
  964.  
  965.         return 0;
  966. }
  967. EXPORT_SYMBOL(drm_helper_initial_config);
  968.  
  969. static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
  970. {
  971.         int dpms = DRM_MODE_DPMS_OFF;
  972.         struct drm_connector *connector;
  973.         struct drm_device *dev = encoder->dev;
  974.  
  975.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  976.                 if (connector->encoder == encoder)
  977.                         if (connector->dpms < dpms)
  978.                                 dpms = connector->dpms;
  979.         return dpms;
  980. }
  981.  
  982. static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
  983. {
  984.         int dpms = DRM_MODE_DPMS_OFF;
  985.         struct drm_connector *connector;
  986.         struct drm_device *dev = crtc->dev;
  987.  
  988.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  989.                 if (connector->encoder && connector->encoder->crtc == crtc)
  990.                         if (connector->dpms < dpms)
  991.                                 dpms = connector->dpms;
  992.         return dpms;
  993. }
  994.  
  995. /**
  996.  * drm_helper_connector_dpms
  997.  * @connector affected connector
  998.  * @mode DPMS mode
  999.  *
  1000.  * Calls the low-level connector DPMS function, then
  1001.  * calls appropriate encoder and crtc DPMS functions as well
  1002.  */
  1003. void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
  1004. {
  1005.         struct drm_encoder *encoder = connector->encoder;
  1006.         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
  1007.         int old_dpms;
  1008.  
  1009.         if (mode == connector->dpms)
  1010.                 return;
  1011.  
  1012.         old_dpms = connector->dpms;
  1013.         connector->dpms = mode;
  1014.  
  1015.         /* from off to on, do crtc then encoder */
  1016.         if (mode < old_dpms) {
  1017.                 if (crtc) {
  1018.                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  1019.                         if (crtc_funcs->dpms)
  1020.                                 (*crtc_funcs->dpms) (crtc,
  1021.                                                      drm_helper_choose_crtc_dpms(crtc));
  1022.                 }
  1023.                 if (encoder) {
  1024.                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  1025.                         if (encoder_funcs->dpms)
  1026.                                 (*encoder_funcs->dpms) (encoder,
  1027.                                                         drm_helper_choose_encoder_dpms(encoder));
  1028.                 }
  1029.         }
  1030.  
  1031.         /* from on to off, do encoder then crtc */
  1032.         if (mode > old_dpms) {
  1033.                 if (encoder) {
  1034.                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  1035.                         if (encoder_funcs->dpms)
  1036.                                 (*encoder_funcs->dpms) (encoder,
  1037.                                                         drm_helper_choose_encoder_dpms(encoder));
  1038.                 }
  1039.                 if (crtc) {
  1040.                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  1041.                         if (crtc_funcs->dpms)
  1042.                                 (*crtc_funcs->dpms) (crtc,
  1043.                                                      drm_helper_choose_crtc_dpms(crtc));
  1044.                 }
  1045.         }
  1046.  
  1047.         return;
  1048. }
  1049. EXPORT_SYMBOL(drm_helper_connector_dpms);
  1050.  
  1051. /**
  1052.  * drm_hotplug_stage_two
  1053.  * @dev DRM device
  1054.  * @connector hotpluged connector
  1055.  *
  1056.  * LOCKING.
  1057.  * Caller must hold mode config lock, function might grab struct lock.
  1058.  *
  1059.  * Stage two of a hotplug.
  1060.  *
  1061.  * RETURNS:
  1062.  * Zero on success, errno on failure.
  1063.  */
  1064. int drm_helper_hotplug_stage_two(struct drm_device *dev)
  1065. {
  1066.         drm_helper_plugged_event(dev);
  1067.  
  1068.         return 0;
  1069. }
  1070. EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
  1071.  
  1072. int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
  1073.                                    struct drm_mode_fb_cmd *mode_cmd)
  1074. {
  1075.         fb->width = mode_cmd->width;
  1076.         fb->height = mode_cmd->height;
  1077.         fb->pitch = mode_cmd->pitch;
  1078.         fb->bits_per_pixel = mode_cmd->bpp;
  1079.         fb->depth = mode_cmd->depth;
  1080.  
  1081.         return 0;
  1082. }
  1083. EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
  1084.  
  1085. int drm_helper_resume_force_mode(struct drm_device *dev)
  1086. {
  1087.         struct drm_crtc *crtc;
  1088.         int ret;
  1089.  
  1090.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  1091.  
  1092.                 if (!crtc->enabled)
  1093.                         continue;
  1094.  
  1095.                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
  1096.                                                crtc->x, crtc->y, crtc->fb);
  1097.  
  1098.                 if (ret == false)
  1099.                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
  1100.         }
  1101.         return 0;
  1102. }
  1103. EXPORT_SYMBOL(drm_helper_resume_force_mode);
  1104.