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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. #include "drm_fb_helper.h"
  36.  
  37. static void drm_mode_validate_flag(struct drm_connector *connector,
  38.                                    int flags)
  39. {
  40.         struct drm_display_mode *mode, *t;
  41.  
  42.         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  43.                 return;
  44.  
  45.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  46.                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  47.                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  48.                         mode->status = MODE_NO_INTERLACE;
  49.                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  50.                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  51.                         mode->status = MODE_NO_DBLESCAN;
  52.         }
  53.  
  54.         return;
  55. }
  56.  
  57. /**
  58.  * drm_helper_probe_connector_modes - get complete set of display modes
  59.  * @dev: DRM device
  60.  * @maxX: max width for modes
  61.  * @maxY: max height for modes
  62.  *
  63.  * LOCKING:
  64.  * Caller must hold mode config lock.
  65.  *
  66.  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  67.  * modes on them.  Modes will first be added to the connector's probed_modes
  68.  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  69.  * put into the normal modes list.
  70.  *
  71.  * Intended to be used either at bootup time or when major configuration
  72.  * changes have occurred.
  73.  *
  74.  * FIXME: take into account monitor limits
  75.  *
  76.  * RETURNS:
  77.  * Number of modes found on @connector.
  78.  */
  79. int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  80.                                             uint32_t maxX, uint32_t maxY)
  81. {
  82.         struct drm_device *dev = connector->dev;
  83.         struct drm_display_mode *mode, *t;
  84.         struct drm_connector_helper_funcs *connector_funcs =
  85.                 connector->helper_private;
  86.         int count = 0;
  87.         int mode_flags = 0;
  88.  
  89.         DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));
  90.         /* set all modes to the unverified state */
  91.         list_for_each_entry_safe(mode, t, &connector->modes, head)
  92.                 mode->status = MODE_UNVERIFIED;
  93.  
  94.         if (connector->force) {
  95.                 if (connector->force == DRM_FORCE_ON)
  96.                         connector->status = connector_status_connected;
  97.                 else
  98.                         connector->status = connector_status_disconnected;
  99.                 if (connector->funcs->force)
  100.                         connector->funcs->force(connector);
  101.         } else
  102.         connector->status = connector->funcs->detect(connector);
  103.  
  104.         if (connector->status == connector_status_disconnected) {
  105.                 DRM_DEBUG_KMS("%s is disconnected\n",
  106.                           drm_get_connector_name(connector));
  107.                 goto prune;
  108.         }
  109.  
  110.         count = (*connector_funcs->get_modes)(connector);
  111.         if (!count) {
  112.                 count = drm_add_modes_noedid(connector, 800, 600);
  113.         if (!count)
  114.                 return 0;
  115.         }
  116.  
  117.         drm_mode_connector_list_update(connector);
  118.  
  119.         if (maxX && maxY)
  120.                 drm_mode_validate_size(dev, &connector->modes, maxX,
  121.                                        maxY, 0);
  122.  
  123.         if (connector->interlace_allowed)
  124.                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
  125.         if (connector->doublescan_allowed)
  126.                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
  127.         drm_mode_validate_flag(connector, mode_flags);
  128.  
  129.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  130.                 if (mode->status == MODE_OK)
  131.                         mode->status = connector_funcs->mode_valid(connector,
  132.                                                                    mode);
  133.         }
  134.  
  135. prune:
  136.         drm_mode_prune_invalid(dev, &connector->modes, true);
  137.  
  138.         if (list_empty(&connector->modes))
  139.                 return 0;
  140.  
  141.         drm_mode_sort(&connector->modes);
  142.  
  143.         DRM_DEBUG_KMS("Probed modes for %s\n",
  144.                                 drm_get_connector_name(connector));
  145.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  146.                 mode->vrefresh = drm_mode_vrefresh(mode);
  147.  
  148.                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  149.                 drm_mode_debug_printmodeline(mode);
  150.         }
  151.  
  152.         return count;
  153. }
  154. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  155.  
  156. int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
  157.                                       uint32_t maxY)
  158. {
  159.         struct drm_connector *connector;
  160.         int count = 0;
  161.  
  162.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  163.                 count += drm_helper_probe_single_connector_modes(connector,
  164.                                                                  maxX, maxY);
  165.         }
  166.  
  167.         return count;
  168. }
  169. EXPORT_SYMBOL(drm_helper_probe_connector_modes);
  170.  
  171. /**
  172.  * drm_helper_encoder_in_use - check if a given encoder is in use
  173.  * @encoder: encoder to check
  174.  *
  175.  * LOCKING:
  176.  * Caller must hold mode config lock.
  177.  *
  178.  * Walk @encoders's DRM device's mode_config and see if it's in use.
  179.  *
  180.  * RETURNS:
  181.  * True if @encoder is part of the mode_config, false otherwise.
  182.  */
  183. bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
  184. {
  185.         struct drm_connector *connector;
  186.         struct drm_device *dev = encoder->dev;
  187.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  188.                 if (connector->encoder == encoder)
  189.                         return true;
  190.         return false;
  191. }
  192. EXPORT_SYMBOL(drm_helper_encoder_in_use);
  193.  
  194. /**
  195.  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
  196.  * @crtc: CRTC to check
  197.  *
  198.  * LOCKING:
  199.  * Caller must hold mode config lock.
  200.  *
  201.  * Walk @crtc's DRM device's mode_config and see if it's in use.
  202.  *
  203.  * RETURNS:
  204.  * True if @crtc is part of the mode_config, false otherwise.
  205.  */
  206. bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
  207. {
  208.         struct drm_encoder *encoder;
  209.         struct drm_device *dev = crtc->dev;
  210.         /* FIXME: Locking around list access? */
  211.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
  212.                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
  213.                         return true;
  214.         return false;
  215. }
  216. EXPORT_SYMBOL(drm_helper_crtc_in_use);
  217.  
  218. /**
  219.  * drm_disable_unused_functions - disable unused objects
  220.  * @dev: DRM device
  221.  *
  222.  * LOCKING:
  223.  * Caller must hold mode config lock.
  224.  *
  225.  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
  226.  * by calling its dpms function, which should power it off.
  227.  */
  228. void drm_helper_disable_unused_functions(struct drm_device *dev)
  229. {
  230.         struct drm_encoder *encoder;
  231.         struct drm_connector *connector;
  232.         struct drm_encoder_helper_funcs *encoder_funcs;
  233.         struct drm_crtc *crtc;
  234.  
  235.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  236.                 if (!connector->encoder)
  237.                         continue;
  238.                 if (connector->status == connector_status_disconnected)
  239.                         connector->encoder = NULL;
  240.         }
  241.  
  242.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  243.                 encoder_funcs = encoder->helper_private;
  244.                 if (!drm_helper_encoder_in_use(encoder)) {
  245.                         if (encoder_funcs->disable)
  246.                                 (*encoder_funcs->disable)(encoder);
  247.                         else
  248.                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  249.                         /* disconnector encoder from any connector */
  250.                         encoder->crtc = NULL;
  251.                 }
  252.         }
  253.  
  254.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  255.                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  256.                 crtc->enabled = drm_helper_crtc_in_use(crtc);
  257.                 if (!crtc->enabled) {
  258.                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
  259.                         crtc->fb = NULL;
  260.                 }
  261.         }
  262. }
  263. EXPORT_SYMBOL(drm_helper_disable_unused_functions);
  264.  
  265. static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
  266. {
  267.         struct drm_display_mode *mode;
  268.  
  269.         list_for_each_entry(mode, &connector->modes, head) {
  270.                 if (drm_mode_width(mode) > width ||
  271.                     drm_mode_height(mode) > height)
  272.                         continue;
  273.                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
  274.                         return mode;
  275.         }
  276.         return NULL;
  277. }
  278.  
  279. static bool drm_has_cmdline_mode(struct drm_connector *connector)
  280. {
  281.         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
  282.         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  283.  
  284.         if (!fb_help_conn)
  285.                 return false;
  286.  
  287.         cmdline_mode = &fb_help_conn->cmdline_mode;
  288.         return cmdline_mode->specified;
  289. }
  290.  
  291. static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
  292. {
  293.         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
  294.         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  295.         struct drm_display_mode *mode = NULL;
  296.  
  297.         if (!fb_help_conn)
  298.                 return mode;
  299.  
  300.         cmdline_mode = &fb_help_conn->cmdline_mode;
  301.         if (cmdline_mode->specified == false)
  302.                 return mode;
  303.  
  304.         /* attempt to find a matching mode in the list of modes
  305.          *  we have gotten so far, if not add a CVT mode that conforms
  306.          */
  307.         if (cmdline_mode->rb || cmdline_mode->margins)
  308.                 goto create_mode;
  309.  
  310.         list_for_each_entry(mode, &connector->modes, head) {
  311.                 /* check width/height */
  312.                 if (mode->hdisplay != cmdline_mode->xres ||
  313.                     mode->vdisplay != cmdline_mode->yres)
  314.                         continue;
  315.  
  316.                 if (cmdline_mode->refresh_specified) {
  317.                         if (mode->vrefresh != cmdline_mode->refresh)
  318.                                 continue;
  319.                 }
  320.  
  321.                 if (cmdline_mode->interlace) {
  322.                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
  323.                                 continue;
  324.                 }
  325.                 return mode;
  326.         }
  327.  
  328. create_mode:
  329.         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
  330.                             cmdline_mode->yres,
  331.                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
  332.                             cmdline_mode->rb, cmdline_mode->interlace,
  333.                             cmdline_mode->margins);
  334.         list_add(&mode->head, &connector->modes);
  335.         return mode;
  336. }
  337.  
  338. static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
  339. {
  340.         bool enable;
  341.  
  342.         if (strict) {
  343.                 enable = connector->status == connector_status_connected;
  344.         } else {
  345.                 enable = connector->status != connector_status_disconnected;
  346.         }
  347.         return enable;
  348. }
  349.  
  350. static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
  351. {
  352.         bool any_enabled = false;
  353.         struct drm_connector *connector;
  354.         int i = 0;
  355.  
  356.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  357.                 enabled[i] = drm_connector_enabled(connector, true);
  358.                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
  359.                           enabled[i] ? "yes" : "no");
  360.                 any_enabled |= enabled[i];
  361.                 i++;
  362.         }
  363.  
  364.         if (any_enabled)
  365.                 return;
  366.  
  367.         i = 0;
  368.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  369.                 enabled[i] = drm_connector_enabled(connector, false);
  370.                 i++;
  371.         }
  372. }
  373.  
  374. static bool drm_target_preferred(struct drm_device *dev,
  375.                                  struct drm_display_mode **modes,
  376.                                  bool *enabled, int width, int height)
  377. {
  378.         struct drm_connector *connector;
  379.         int i = 0;
  380.  
  381.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  382.  
  383.                 if (enabled[i] == false) {
  384.                         i++;
  385.                         continue;
  386.                 }
  387.  
  388.                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
  389.                               connector->base.id);
  390.  
  391.                 /* got for command line mode first */
  392.                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
  393.                 if (!modes[i]) {
  394.                 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
  395.                           connector->base.id);
  396.                 modes[i] = drm_has_preferred_mode(connector, width, height);
  397.                 }
  398.                 /* No preferred modes, pick one off the list */
  399.                 if (!modes[i] && !list_empty(&connector->modes)) {
  400.                         list_for_each_entry(modes[i], &connector->modes, head)
  401.                                 break;
  402.                 }
  403.                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
  404.                           "none");
  405.                 i++;
  406.         }
  407.         return true;
  408. }
  409.  
  410. static int drm_pick_crtcs(struct drm_device *dev,
  411.                           struct drm_crtc **best_crtcs,
  412.                           struct drm_display_mode **modes,
  413.                           int n, int width, int height)
  414. {
  415.         int c, o;
  416.         struct drm_connector *connector;
  417.         struct drm_connector_helper_funcs *connector_funcs;
  418.         struct drm_encoder *encoder;
  419.         struct drm_crtc *best_crtc;
  420.         int my_score, best_score, score;
  421.         struct drm_crtc **crtcs, *crtc;
  422.  
  423.         if (n == dev->mode_config.num_connector)
  424.                 return 0;
  425.         c = 0;
  426.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  427.                 if (c == n)
  428.                         break;
  429.                 c++;
  430.         }
  431.  
  432.         best_crtcs[n] = NULL;
  433.         best_crtc = NULL;
  434.         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
  435.         if (modes[n] == NULL)
  436.                 return best_score;
  437.  
  438.         crtcs = kmalloc(dev->mode_config.num_connector *
  439.                         sizeof(struct drm_crtc *), GFP_KERNEL);
  440.         if (!crtcs)
  441.                 return best_score;
  442.  
  443.         my_score = 1;
  444.         if (connector->status == connector_status_connected)
  445.                 my_score++;
  446.         if (drm_has_cmdline_mode(connector))
  447.                 my_score++;
  448.         if (drm_has_preferred_mode(connector, width, height))
  449.                 my_score++;
  450.  
  451.         connector_funcs = connector->helper_private;
  452.         encoder = connector_funcs->best_encoder(connector);
  453.         if (!encoder)
  454.                 goto out;
  455.  
  456.         connector->encoder = encoder;
  457.  
  458.         /* select a crtc for this connector and then attempt to configure
  459.            remaining connectors */
  460.         c = 0;
  461.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  462.  
  463.                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
  464.                         c++;
  465.                         continue;
  466.                 }
  467.  
  468.                 for (o = 0; o < n; o++)
  469.                         if (best_crtcs[o] == crtc)
  470.                                 break;
  471.  
  472.                 if (o < n) {
  473.                         /* ignore cloning for now */
  474.                         c++;
  475.                         continue;
  476.                 }
  477.  
  478.                 crtcs[n] = crtc;
  479.                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
  480.                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
  481.                                                   width, height);
  482.                 if (score > best_score) {
  483.                         best_crtc = crtc;
  484.                         best_score = score;
  485.                         memcpy(best_crtcs, crtcs,
  486.                                dev->mode_config.num_connector *
  487.                                sizeof(struct drm_crtc *));
  488.                 }
  489.                 c++;
  490.         }
  491. out:
  492.         kfree(crtcs);
  493.         return best_score;
  494. }
  495.  
  496. static void drm_setup_crtcs(struct drm_device *dev)
  497. {
  498.         struct drm_crtc **crtcs;
  499.         struct drm_display_mode **modes;
  500.         struct drm_encoder *encoder;
  501.         struct drm_connector *connector;
  502.         bool *enabled;
  503.         int width, height;
  504.         int i, ret;
  505.  
  506.         DRM_DEBUG_KMS("\n");
  507.  
  508.         width = dev->mode_config.max_width;
  509.         height = dev->mode_config.max_height;
  510.  
  511.         /* clean out all the encoder/crtc combos */
  512.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  513.                 encoder->crtc = NULL;
  514.         }
  515.  
  516.         crtcs = kcalloc(dev->mode_config.num_connector,
  517.                         sizeof(struct drm_crtc *), GFP_KERNEL);
  518.         modes = kcalloc(dev->mode_config.num_connector,
  519.                         sizeof(struct drm_display_mode *), GFP_KERNEL);
  520.         enabled = kcalloc(dev->mode_config.num_connector,
  521.                           sizeof(bool), GFP_KERNEL);
  522.  
  523.         drm_enable_connectors(dev, enabled);
  524.  
  525.         ret = drm_target_preferred(dev, modes, enabled, width, height);
  526.         if (!ret)
  527.                 DRM_ERROR("Unable to find initial modes\n");
  528.  
  529.         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
  530.  
  531.         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
  532.  
  533.         i = 0;
  534.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  535.                 struct drm_display_mode *mode = modes[i];
  536.                 struct drm_crtc *crtc = crtcs[i];
  537.  
  538.                 if (connector->encoder == NULL) {
  539.                         i++;
  540.                         continue;
  541.                 }
  542.  
  543.                 if (mode && crtc) {
  544.                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
  545.                                   mode->name, crtc->base.id);
  546.                         crtc->desired_mode = mode;
  547.                         connector->encoder->crtc = crtc;
  548.                 } else {
  549.                         connector->encoder->crtc = NULL;
  550.                         connector->encoder = NULL;
  551.                 }
  552.                 i++;
  553.         }
  554.  
  555.         kfree(crtcs);
  556.         kfree(modes);
  557.         kfree(enabled);
  558. }
  559.  
  560. /**
  561.  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
  562.  * @encoder: encoder to test
  563.  * @crtc: crtc to test
  564.  *
  565.  * Return false if @encoder can't be driven by @crtc, true otherwise.
  566.  */
  567. static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
  568.                                 struct drm_crtc *crtc)
  569. {
  570.         struct drm_device *dev;
  571.         struct drm_crtc *tmp;
  572.         int crtc_mask = 1;
  573.  
  574. //   WARN(!crtc, "checking null crtc?");
  575.  
  576.         dev = crtc->dev;
  577.  
  578.         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
  579.                 if (tmp == crtc)
  580.                         break;
  581.                 crtc_mask <<= 1;
  582.         }
  583.  
  584.         if (encoder->possible_crtcs & crtc_mask)
  585.                 return true;
  586.         return false;
  587. }
  588.  
  589. /*
  590.  * Check the CRTC we're going to map each output to vs. its current
  591.  * CRTC.  If they don't match, we have to disable the output and the CRTC
  592.  * since the driver will have to re-route things.
  593.  */
  594. static void
  595. drm_crtc_prepare_encoders(struct drm_device *dev)
  596. {
  597.         struct drm_encoder_helper_funcs *encoder_funcs;
  598.         struct drm_encoder *encoder;
  599.  
  600.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  601.                 encoder_funcs = encoder->helper_private;
  602.                 /* Disable unused encoders */
  603.                 if (encoder->crtc == NULL)
  604.                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  605.                 /* Disable encoders whose CRTC is about to change */
  606.                 if (encoder_funcs->get_crtc &&
  607.                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
  608.                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  609.         }
  610. }
  611.  
  612. /**
  613.  * drm_crtc_set_mode - set a mode
  614.  * @crtc: CRTC to program
  615.  * @mode: mode to use
  616.  * @x: width of mode
  617.  * @y: height of mode
  618.  *
  619.  * LOCKING:
  620.  * Caller must hold mode config lock.
  621.  *
  622.  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
  623.  * to fixup or reject the mode prior to trying to set it.
  624.  *
  625.  * RETURNS:
  626.  * True if the mode was set successfully, or false otherwise.
  627.  */
  628. bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
  629.                               struct drm_display_mode *mode,
  630.                               int x, int y,
  631.                               struct drm_framebuffer *old_fb)
  632. {
  633.         struct drm_device *dev = crtc->dev;
  634.         struct drm_display_mode *adjusted_mode, saved_mode;
  635.         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  636.         struct drm_encoder_helper_funcs *encoder_funcs;
  637.         int saved_x, saved_y;
  638.         struct drm_encoder *encoder;
  639.         bool ret = true;
  640.  
  641.         adjusted_mode = drm_mode_duplicate(dev, mode);
  642.  
  643.         crtc->enabled = drm_helper_crtc_in_use(crtc);
  644.  
  645.         if (!crtc->enabled)
  646.                 return true;
  647.  
  648.         saved_mode = crtc->mode;
  649.         saved_x = crtc->x;
  650.         saved_y = crtc->y;
  651.  
  652.         /* Update crtc values up front so the driver can rely on them for mode
  653.          * setting.
  654.          */
  655.         crtc->mode = *mode;
  656.         crtc->x = x;
  657.         crtc->y = y;
  658.  
  659.         /* Pass our mode to the connectors and the CRTC to give them a chance to
  660.          * adjust it according to limitations or connector properties, and also
  661.          * a chance to reject the mode entirely.
  662.          */
  663.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  664.  
  665.                 if (encoder->crtc != crtc)
  666.                         continue;
  667.                 encoder_funcs = encoder->helper_private;
  668.                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
  669.                                                       adjusted_mode))) {
  670.                         goto done;
  671.                 }
  672.         }
  673.  
  674.         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
  675.                 goto done;
  676.         }
  677.  
  678.         /* Prepare the encoders and CRTCs before setting the mode. */
  679.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  680.  
  681.                 if (encoder->crtc != crtc)
  682.                         continue;
  683.                 encoder_funcs = encoder->helper_private;
  684.                 /* Disable the encoders as the first thing we do. */
  685.                 encoder_funcs->prepare(encoder);
  686.         }
  687.  
  688.         drm_crtc_prepare_encoders(dev);
  689.  
  690.         crtc_funcs->prepare(crtc);
  691.  
  692.         /* Set up the DPLL and any encoders state that needs to adjust or depend
  693.          * on the DPLL.
  694.          */
  695.         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
  696.         if (!ret)
  697.             goto done;
  698.  
  699.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  700.  
  701.                 if (encoder->crtc != crtc)
  702.                         continue;
  703.  
  704.                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
  705.                          mode->name, mode->base.id);
  706.                 encoder_funcs = encoder->helper_private;
  707.                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
  708.         }
  709.  
  710.         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
  711.         crtc_funcs->commit(crtc);
  712.  
  713.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  714.  
  715.                 if (encoder->crtc != crtc)
  716.                         continue;
  717.  
  718.                 encoder_funcs = encoder->helper_private;
  719.                 encoder_funcs->commit(encoder);
  720.  
  721.         }
  722.  
  723.         /* XXX free adjustedmode */
  724.         drm_mode_destroy(dev, adjusted_mode);
  725.         /* FIXME: add subpixel order */
  726. done:
  727.         if (!ret) {
  728.                 crtc->mode = saved_mode;
  729.                 crtc->x = saved_x;
  730.                 crtc->y = saved_y;
  731.         }
  732.  
  733.         return ret;
  734. }
  735. EXPORT_SYMBOL(drm_crtc_helper_set_mode);
  736.  
  737.  
  738. /**
  739.  * drm_crtc_helper_set_config - set a new config from userspace
  740.  * @crtc: CRTC to setup
  741.  * @crtc_info: user provided configuration
  742.  * @new_mode: new mode to set
  743.  * @connector_set: set of connectors for the new config
  744.  * @fb: new framebuffer
  745.  *
  746.  * LOCKING:
  747.  * Caller must hold mode config lock.
  748.  *
  749.  * Setup a new configuration, provided by the user in @crtc_info, and enable
  750.  * it.
  751.  *
  752.  * RETURNS:
  753.  * Zero. (FIXME)
  754.  */
  755. int drm_crtc_helper_set_config(struct drm_mode_set *set)
  756. {
  757.         struct drm_device *dev;
  758.         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
  759.         struct drm_encoder *save_encoders, *new_encoder, *encoder;
  760.         struct drm_framebuffer *old_fb = NULL;
  761.         bool mode_changed = false; /* if true do a full mode set */
  762.         bool fb_changed = false; /* if true and !mode_changed just do a flip */
  763.         struct drm_connector *save_connectors, *connector;
  764.         int count = 0, ro, fail = 0;
  765.         struct drm_crtc_helper_funcs *crtc_funcs;
  766.         int ret = 0;
  767.  
  768.         DRM_DEBUG_KMS("\n");
  769.  
  770.         if (!set)
  771.                 return -EINVAL;
  772.  
  773.         if (!set->crtc)
  774.                 return -EINVAL;
  775.  
  776.         if (!set->crtc->helper_private)
  777.                 return -EINVAL;
  778.  
  779.         crtc_funcs = set->crtc->helper_private;
  780.  
  781.         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
  782.                         " %d (x, y) (%i, %i)\n",
  783.                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
  784.                   (int)set->num_connectors, set->x, set->y);
  785.  
  786.         dev = set->crtc->dev;
  787.  
  788.         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
  789.          * connector data. */
  790.         save_crtcs = kzalloc(dev->mode_config.num_crtc *
  791.                              sizeof(struct drm_crtc), GFP_KERNEL);
  792.         if (!save_crtcs)
  793.                 return -ENOMEM;
  794.  
  795.         save_encoders = kzalloc(dev->mode_config.num_encoder *
  796.                                 sizeof(struct drm_encoder), GFP_KERNEL);
  797.         if (!save_encoders) {
  798.                 kfree(save_crtcs);
  799.                 return -ENOMEM;
  800.         }
  801.  
  802.         save_connectors = kzalloc(dev->mode_config.num_connector *
  803.                                 sizeof(struct drm_connector), GFP_KERNEL);
  804.         if (!save_connectors) {
  805.                 kfree(save_crtcs);
  806.                 kfree(save_encoders);
  807.                 return -ENOMEM;
  808.         }
  809.  
  810.         /* Copy data. Note that driver private data is not affected.
  811.          * Should anything bad happen only the expected state is
  812.          * restored, not the drivers personal bookkeeping.
  813.          */
  814.         count = 0;
  815.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  816.                 save_crtcs[count++] = *crtc;
  817.         }
  818.  
  819.         count = 0;
  820.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  821.                 save_encoders[count++] = *encoder;
  822.         }
  823.  
  824.         count = 0;
  825.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  826.                 save_connectors[count++] = *connector;
  827.         }
  828.  
  829.         /* We should be able to check here if the fb has the same properties
  830.          * and then just flip_or_move it */
  831.         if (set->crtc->fb != set->fb) {
  832.                 /* If we have no fb then treat it as a full mode set */
  833.                 if (set->crtc->fb == NULL) {
  834.                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
  835.                         mode_changed = true;
  836.                 } else if (set->fb == NULL) {
  837.                         mode_changed = true;
  838.                 } else if ((set->fb->bits_per_pixel !=
  839.                          set->crtc->fb->bits_per_pixel) ||
  840.                          set->fb->depth != set->crtc->fb->depth)
  841.                         fb_changed = true;
  842.                 else
  843.                         fb_changed = true;
  844.         }
  845.  
  846.         if (set->x != set->crtc->x || set->y != set->crtc->y)
  847.                 fb_changed = true;
  848.  
  849.         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
  850.                 DRM_DEBUG_KMS("modes are different, full mode set\n");
  851.                 drm_mode_debug_printmodeline(&set->crtc->mode);
  852.                 drm_mode_debug_printmodeline(set->mode);
  853.                 mode_changed = true;
  854.         }
  855.  
  856.         /* a) traverse passed in connector list and get encoders for them */
  857.         count = 0;
  858.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  859.                 struct drm_connector_helper_funcs *connector_funcs =
  860.                         connector->helper_private;
  861.                 new_encoder = connector->encoder;
  862.                 for (ro = 0; ro < set->num_connectors; ro++) {
  863.                         if (set->connectors[ro] == connector) {
  864.                                 new_encoder = connector_funcs->best_encoder(connector);
  865.                                 /* if we can't get an encoder for a connector
  866.                                    we are setting now - then fail */
  867.                                 if (new_encoder == NULL)
  868.                                         /* don't break so fail path works correct */
  869.                                         fail = 1;
  870.                                 break;
  871.                         }
  872.                 }
  873.  
  874.                 if (new_encoder != connector->encoder) {
  875.                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
  876.                         mode_changed = true;
  877.                         /* If the encoder is reused for another connector, then
  878.                          * the appropriate crtc will be set later.
  879.                          */
  880.                         if (connector->encoder)
  881.                                 connector->encoder->crtc = NULL;
  882.                         connector->encoder = new_encoder;
  883.                 }
  884.         }
  885.  
  886.         if (fail) {
  887.                 ret = -EINVAL;
  888.                 goto fail;
  889.         }
  890.  
  891.         count = 0;
  892.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  893.                 if (!connector->encoder)
  894.                         continue;
  895.  
  896.                 if (connector->encoder->crtc == set->crtc)
  897.                         new_crtc = NULL;
  898.                 else
  899.                         new_crtc = connector->encoder->crtc;
  900.  
  901.                 for (ro = 0; ro < set->num_connectors; ro++) {
  902.                         if (set->connectors[ro] == connector)
  903.                                 new_crtc = set->crtc;
  904.                 }
  905.  
  906.                 /* Make sure the new CRTC will work with the encoder */
  907.                 if (new_crtc &&
  908.                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
  909.                         ret = -EINVAL;
  910.                         goto fail;
  911.                 }
  912.                 if (new_crtc != connector->encoder->crtc) {
  913.                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
  914.                         mode_changed = true;
  915.                         connector->encoder->crtc = new_crtc;
  916.                 }
  917.                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
  918.                           connector->base.id, new_crtc);
  919.         }
  920.  
  921.         /* mode_set_base is not a required function */
  922.         if (fb_changed && !crtc_funcs->mode_set_base)
  923.                 mode_changed = true;
  924.  
  925.         if (mode_changed) {
  926.                 old_fb = set->crtc->fb;
  927.                 set->crtc->fb = set->fb;
  928.                 set->crtc->enabled = (set->mode != NULL);
  929.                 if (set->mode != NULL) {
  930.                         DRM_DEBUG_KMS("attempting to set mode from"
  931.                                         " userspace\n");
  932.                         drm_mode_debug_printmodeline(set->mode);
  933.                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
  934.                                                       set->x, set->y,
  935.                                                       old_fb)) {
  936.                                 DRM_ERROR("failed to set mode on crtc %p\n",
  937.                                           set->crtc);
  938.                                 ret = -EINVAL;
  939.                                 goto fail;
  940.                         }
  941.                         /* TODO are these needed? */
  942.                         set->crtc->desired_x = set->x;
  943.                         set->crtc->desired_y = set->y;
  944.                         set->crtc->desired_mode = set->mode;
  945.                 }
  946.                 drm_helper_disable_unused_functions(dev);
  947.         } else if (fb_changed) {
  948.                 set->crtc->x = set->x;
  949.                 set->crtc->y = set->y;
  950.  
  951.                 old_fb = set->crtc->fb;
  952.                 if (set->crtc->fb != set->fb)
  953.                         set->crtc->fb = set->fb;
  954.                 ret = crtc_funcs->mode_set_base(set->crtc,
  955.                                                 set->x, set->y, old_fb);
  956.                 if (ret != 0)
  957.                         goto fail;
  958.         }
  959.  
  960.         kfree(save_connectors);
  961.         kfree(save_encoders);
  962.         kfree(save_crtcs);
  963.         return 0;
  964.  
  965. fail:
  966.         /* Restore all previous data. */
  967.         count = 0;
  968.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  969.                 *crtc = save_crtcs[count++];
  970.         }
  971.  
  972.         count = 0;
  973.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  974.                 *encoder = save_encoders[count++];
  975.         }
  976.  
  977.         count = 0;
  978.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  979.                 *connector = save_connectors[count++];
  980.         }
  981.  
  982.         kfree(save_connectors);
  983.         kfree(save_encoders);
  984.         kfree(save_crtcs);
  985.         return ret;
  986. }
  987. EXPORT_SYMBOL(drm_crtc_helper_set_config);
  988.  
  989. bool drm_helper_plugged_event(struct drm_device *dev)
  990. {
  991.         DRM_DEBUG_KMS("\n");
  992.  
  993.         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
  994.                                          dev->mode_config.max_height);
  995.  
  996.         drm_setup_crtcs(dev);
  997.  
  998.         /* alert the driver fb layer */
  999.     dev->mode_config.funcs->fb_changed(dev);
  1000.  
  1001.         /* FIXME: send hotplug event */
  1002.         return true;
  1003. }
  1004. /**
  1005.  * drm_initial_config - setup a sane initial connector configuration
  1006.  * @dev: DRM device
  1007.  *
  1008.  * LOCKING:
  1009.  * Called at init time, must take mode config lock.
  1010.  *
  1011.  * Scan the CRTCs and connectors and try to put together an initial setup.
  1012.  * At the moment, this is a cloned configuration across all heads with
  1013.  * a new framebuffer object as the backing store.
  1014.  *
  1015.  * RETURNS:
  1016.  * Zero if everything went ok, nonzero otherwise.
  1017.  */
  1018. bool drm_helper_initial_config(struct drm_device *dev)
  1019. {
  1020.         int count = 0;
  1021.  
  1022.         count = drm_helper_probe_connector_modes(dev,
  1023.                                                  dev->mode_config.max_width,
  1024.                                                  dev->mode_config.max_height);
  1025.  
  1026.         /*
  1027.          * we shouldn't end up with no modes here.
  1028.          */
  1029. //      WARN(!count, "Connected connector with 0 modes\n");
  1030.  
  1031.         drm_setup_crtcs(dev);
  1032.  
  1033.    /* alert the driver fb layer */
  1034.     dev->mode_config.funcs->fb_changed(dev);
  1035.  
  1036.         return 0;
  1037. }
  1038. EXPORT_SYMBOL(drm_helper_initial_config);
  1039.  
  1040. static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
  1041. {
  1042.         int dpms = DRM_MODE_DPMS_OFF;
  1043.         struct drm_connector *connector;
  1044.         struct drm_device *dev = encoder->dev;
  1045.  
  1046.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  1047.                 if (connector->encoder == encoder)
  1048.                         if (connector->dpms < dpms)
  1049.                                 dpms = connector->dpms;
  1050.         return dpms;
  1051. }
  1052.  
  1053. static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
  1054. {
  1055.         int dpms = DRM_MODE_DPMS_OFF;
  1056.         struct drm_connector *connector;
  1057.         struct drm_device *dev = crtc->dev;
  1058.  
  1059.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  1060.                 if (connector->encoder && connector->encoder->crtc == crtc)
  1061.                         if (connector->dpms < dpms)
  1062.                                 dpms = connector->dpms;
  1063.         return dpms;
  1064. }
  1065.  
  1066. /**
  1067.  * drm_helper_connector_dpms
  1068.  * @connector affected connector
  1069.  * @mode DPMS mode
  1070.  *
  1071.  * Calls the low-level connector DPMS function, then
  1072.  * calls appropriate encoder and crtc DPMS functions as well
  1073.  */
  1074. void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
  1075. {
  1076.         struct drm_encoder *encoder = connector->encoder;
  1077.         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
  1078.         int old_dpms;
  1079.  
  1080.         if (mode == connector->dpms)
  1081.                 return;
  1082.  
  1083.         old_dpms = connector->dpms;
  1084.         connector->dpms = mode;
  1085.  
  1086.         /* from off to on, do crtc then encoder */
  1087.         if (mode < old_dpms) {
  1088.                 if (crtc) {
  1089.                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  1090.                         if (crtc_funcs->dpms)
  1091.                                 (*crtc_funcs->dpms) (crtc,
  1092.                                                      drm_helper_choose_crtc_dpms(crtc));
  1093.                 }
  1094.                 if (encoder) {
  1095.                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  1096.                         if (encoder_funcs->dpms)
  1097.                                 (*encoder_funcs->dpms) (encoder,
  1098.                                                         drm_helper_choose_encoder_dpms(encoder));
  1099.                 }
  1100.         }
  1101.  
  1102.         /* from on to off, do encoder then crtc */
  1103.         if (mode > old_dpms) {
  1104.                 if (encoder) {
  1105.                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  1106.                         if (encoder_funcs->dpms)
  1107.                                 (*encoder_funcs->dpms) (encoder,
  1108.                                                         drm_helper_choose_encoder_dpms(encoder));
  1109.                 }
  1110.                 if (crtc) {
  1111.                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  1112.                         if (crtc_funcs->dpms)
  1113.                                 (*crtc_funcs->dpms) (crtc,
  1114.                                                      drm_helper_choose_crtc_dpms(crtc));
  1115.                 }
  1116.         }
  1117.  
  1118.         return;
  1119. }
  1120. EXPORT_SYMBOL(drm_helper_connector_dpms);
  1121.  
  1122. /**
  1123.  * drm_hotplug_stage_two
  1124.  * @dev DRM device
  1125.  * @connector hotpluged connector
  1126.  *
  1127.  * LOCKING.
  1128.  * Caller must hold mode config lock, function might grab struct lock.
  1129.  *
  1130.  * Stage two of a hotplug.
  1131.  *
  1132.  * RETURNS:
  1133.  * Zero on success, errno on failure.
  1134.  */
  1135. int drm_helper_hotplug_stage_two(struct drm_device *dev)
  1136. {
  1137.         drm_helper_plugged_event(dev);
  1138.  
  1139.         return 0;
  1140. }
  1141. EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
  1142.  
  1143. int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
  1144.                                    struct drm_mode_fb_cmd *mode_cmd)
  1145. {
  1146.         fb->width = mode_cmd->width;
  1147.         fb->height = mode_cmd->height;
  1148.         fb->pitch = mode_cmd->pitch;
  1149.         fb->bits_per_pixel = mode_cmd->bpp;
  1150.         fb->depth = mode_cmd->depth;
  1151.  
  1152.         return 0;
  1153. }
  1154. EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
  1155.  
  1156. void sysSetScreen(int width, int height, int pitch)
  1157. {
  1158.   asm __volatile__
  1159.   (
  1160.     "call *__imp__SetScreen"
  1161.     :
  1162.     :"a" (width-1),"d"(height-1), "c"(pitch)
  1163.     :"memory","cc"
  1164.   );
  1165. }
  1166.  
  1167.  
  1168. int drm_helper_resume_force_mode(struct drm_device *dev)
  1169. {
  1170.         struct drm_crtc *crtc;
  1171.         int ret;
  1172.  
  1173.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  1174.  
  1175.        if (!crtc->enabled)
  1176.            continue;
  1177.  
  1178.                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
  1179.                                                crtc->x, crtc->y, crtc->fb);
  1180.  
  1181.                 if (ret == false)
  1182.                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
  1183.         }
  1184.         /* disable the unused connectors while restoring the modesetting */
  1185.         drm_helper_disable_unused_functions(dev);
  1186.         return 0;
  1187. }
  1188. EXPORT_SYMBOL(drm_helper_resume_force_mode);
  1189.