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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 bool drm_kms_helper_poll = true;
  38.  
  39. static void drm_mode_validate_flag(struct drm_connector *connector,
  40.                                    int flags)
  41. {
  42.         struct drm_display_mode *mode, *t;
  43.  
  44.         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  45.                 return;
  46.  
  47.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  48.                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  49.                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  50.                         mode->status = MODE_NO_INTERLACE;
  51.                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  52.                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  53.                         mode->status = MODE_NO_DBLESCAN;
  54.         }
  55.  
  56.         return;
  57. }
  58.  
  59. /**
  60.  * drm_helper_probe_single_connector_modes - get complete set of display modes
  61.  * @dev: DRM device
  62.  * @maxX: max width for modes
  63.  * @maxY: max height for modes
  64.  *
  65.  * LOCKING:
  66.  * Caller must hold mode config lock.
  67.  *
  68.  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  69.  * modes on them.  Modes will first be added to the connector's probed_modes
  70.  * list, then culled (based on validity and the @maxX, @maxY parameters) and
  71.  * put into the normal modes list.
  72.  *
  73.  * Intended to be used either at bootup time or when major configuration
  74.  * changes have occurred.
  75.  *
  76.  * FIXME: take into account monitor limits
  77.  *
  78.  * RETURNS:
  79.  * Number of modes found on @connector.
  80.  */
  81. int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  82.                                             uint32_t maxX, uint32_t maxY)
  83. {
  84.         struct drm_device *dev = connector->dev;
  85.         struct drm_display_mode *mode, *t;
  86.         struct drm_connector_helper_funcs *connector_funcs =
  87.                 connector->helper_private;
  88.         int count = 0;
  89.         int mode_flags = 0;
  90.  
  91.         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
  92.                         drm_get_connector_name(connector));
  93.         /* set all modes to the unverified state */
  94.         list_for_each_entry_safe(mode, t, &connector->modes, head)
  95.                 mode->status = MODE_UNVERIFIED;
  96.  
  97.         if (connector->force) {
  98.                 if (connector->force == DRM_FORCE_ON)
  99.                         connector->status = connector_status_connected;
  100.                 else
  101.                         connector->status = connector_status_disconnected;
  102.                 if (connector->funcs->force)
  103.                         connector->funcs->force(connector);
  104.         } else {
  105.                 connector->status = connector->funcs->detect(connector, true);
  106. //              drm_kms_helper_poll_enable(dev);
  107.         }
  108.  
  109.         if (connector->status == connector_status_disconnected) {
  110.                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
  111.                         connector->base.id, drm_get_connector_name(connector));
  112.                 drm_mode_connector_update_edid_property(connector, NULL);
  113.                 goto prune;
  114.         }
  115.  
  116.         count = (*connector_funcs->get_modes)(connector);
  117.         if (count == 0 && connector->status == connector_status_connected)
  118.                 count = drm_add_modes_noedid(connector, 1024, 768);
  119.         if (count == 0)
  120.                 goto prune;
  121.  
  122.         drm_mode_connector_list_update(connector);
  123.  
  124.         if (maxX && maxY)
  125.                 drm_mode_validate_size(dev, &connector->modes, maxX,
  126.                                        maxY, 0);
  127.  
  128.         if (connector->interlace_allowed)
  129.                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
  130.         if (connector->doublescan_allowed)
  131.                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
  132.         drm_mode_validate_flag(connector, mode_flags);
  133.  
  134.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  135.                 if (mode->status == MODE_OK)
  136.                         mode->status = connector_funcs->mode_valid(connector,
  137.                                                                    mode);
  138.         }
  139.  
  140. prune:
  141.         drm_mode_prune_invalid(dev, &connector->modes, true);
  142.  
  143.         if (list_empty(&connector->modes))
  144.                 return 0;
  145.  
  146.         drm_mode_sort(&connector->modes);
  147.  
  148.         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
  149.                                 drm_get_connector_name(connector));
  150.         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  151.                 mode->vrefresh = drm_mode_vrefresh(mode);
  152.  
  153.                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  154.                 drm_mode_debug_printmodeline(mode);
  155.         }
  156.  
  157.         return count;
  158. }
  159. EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
  160.  
  161. /**
  162.  * drm_helper_encoder_in_use - check if a given encoder is in use
  163.  * @encoder: encoder to check
  164.  *
  165.  * LOCKING:
  166.  * Caller must hold mode config lock.
  167.  *
  168.  * Walk @encoders's DRM device's mode_config and see if it's in use.
  169.  *
  170.  * RETURNS:
  171.  * True if @encoder is part of the mode_config, false otherwise.
  172.  */
  173. bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
  174. {
  175.         struct drm_connector *connector;
  176.         struct drm_device *dev = encoder->dev;
  177.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  178.                 if (connector->encoder == encoder)
  179.                         return true;
  180.         return false;
  181. }
  182. EXPORT_SYMBOL(drm_helper_encoder_in_use);
  183.  
  184. /**
  185.  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
  186.  * @crtc: CRTC to check
  187.  *
  188.  * LOCKING:
  189.  * Caller must hold mode config lock.
  190.  *
  191.  * Walk @crtc's DRM device's mode_config and see if it's in use.
  192.  *
  193.  * RETURNS:
  194.  * True if @crtc is part of the mode_config, false otherwise.
  195.  */
  196. bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
  197. {
  198.         struct drm_encoder *encoder;
  199.         struct drm_device *dev = crtc->dev;
  200.         /* FIXME: Locking around list access? */
  201.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
  202.                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
  203.                         return true;
  204.         return false;
  205. }
  206. EXPORT_SYMBOL(drm_helper_crtc_in_use);
  207.  
  208. static void
  209. drm_encoder_disable(struct drm_encoder *encoder)
  210. {
  211.         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  212.  
  213.         if (encoder_funcs->disable)
  214.                 (*encoder_funcs->disable)(encoder);
  215.         else
  216.                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
  217. }
  218.  
  219. /**
  220.  * drm_helper_disable_unused_functions - disable unused objects
  221.  * @dev: DRM device
  222.  *
  223.  * LOCKING:
  224.  * Caller must hold mode config lock.
  225.  *
  226.  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
  227.  * by calling its dpms function, which should power it off.
  228.  */
  229. void drm_helper_disable_unused_functions(struct drm_device *dev)
  230. {
  231.         struct drm_encoder *encoder;
  232.         struct drm_connector *connector;
  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.                 if (!drm_helper_encoder_in_use(encoder)) {
  244.                         drm_encoder_disable(encoder);
  245.                         /* disconnector encoder from any connector */
  246.                         encoder->crtc = NULL;
  247.                 }
  248.         }
  249.  
  250.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  251.                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  252.                 crtc->enabled = drm_helper_crtc_in_use(crtc);
  253.                 if (!crtc->enabled) {
  254.                         if (crtc_funcs->disable)
  255.                                 (*crtc_funcs->disable)(crtc);
  256.                         else
  257.                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
  258.                         crtc->fb = NULL;
  259.                 }
  260.         }
  261. }
  262. EXPORT_SYMBOL(drm_helper_disable_unused_functions);
  263.  
  264. /**
  265.  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
  266.  * @encoder: encoder to test
  267.  * @crtc: crtc to test
  268.  *
  269.  * Return false if @encoder can't be driven by @crtc, true otherwise.
  270.  */
  271. static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
  272.                                 struct drm_crtc *crtc)
  273. {
  274.         struct drm_device *dev;
  275.         struct drm_crtc *tmp;
  276.         int crtc_mask = 1;
  277.  
  278.         WARN(!crtc, "checking null crtc?\n");
  279.  
  280.         dev = crtc->dev;
  281.  
  282.         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
  283.                 if (tmp == crtc)
  284.                         break;
  285.                 crtc_mask <<= 1;
  286.         }
  287.  
  288.         if (encoder->possible_crtcs & crtc_mask)
  289.                 return true;
  290.         return false;
  291. }
  292.  
  293. /*
  294.  * Check the CRTC we're going to map each output to vs. its current
  295.  * CRTC.  If they don't match, we have to disable the output and the CRTC
  296.  * since the driver will have to re-route things.
  297.  */
  298. static void
  299. drm_crtc_prepare_encoders(struct drm_device *dev)
  300. {
  301.         struct drm_encoder_helper_funcs *encoder_funcs;
  302.         struct drm_encoder *encoder;
  303.  
  304.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  305.                 encoder_funcs = encoder->helper_private;
  306.                 /* Disable unused encoders */
  307.                 if (encoder->crtc == NULL)
  308.                         drm_encoder_disable(encoder);
  309.                 /* Disable encoders whose CRTC is about to change */
  310.                 if (encoder_funcs->get_crtc &&
  311.                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
  312.                         drm_encoder_disable(encoder);
  313.         }
  314. }
  315.  
  316. /**
  317.  * drm_crtc_set_mode - set a mode
  318.  * @crtc: CRTC to program
  319.  * @mode: mode to use
  320.  * @x: width of mode
  321.  * @y: height of mode
  322.  *
  323.  * LOCKING:
  324.  * Caller must hold mode config lock.
  325.  *
  326.  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
  327.  * to fixup or reject the mode prior to trying to set it.
  328.  *
  329.  * RETURNS:
  330.  * True if the mode was set successfully, or false otherwise.
  331.  */
  332. bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
  333.                               struct drm_display_mode *mode,
  334.                               int x, int y,
  335.                               struct drm_framebuffer *old_fb)
  336. {
  337.         struct drm_device *dev = crtc->dev;
  338.         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
  339.         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  340.         struct drm_encoder_helper_funcs *encoder_funcs;
  341.         int saved_x, saved_y;
  342.         struct drm_encoder *encoder;
  343.         bool ret = true;
  344.  
  345.         crtc->enabled = drm_helper_crtc_in_use(crtc);
  346.         if (!crtc->enabled)
  347.                 return true;
  348.  
  349.         adjusted_mode = drm_mode_duplicate(dev, mode);
  350.  
  351.         saved_hwmode = crtc->hwmode;
  352.         saved_mode = crtc->mode;
  353.         saved_x = crtc->x;
  354.         saved_y = crtc->y;
  355.  
  356.         /* Update crtc values up front so the driver can rely on them for mode
  357.          * setting.
  358.          */
  359.         crtc->mode = *mode;
  360.         crtc->x = x;
  361.         crtc->y = y;
  362.  
  363.         /* Pass our mode to the connectors and the CRTC to give them a chance to
  364.          * adjust it according to limitations or connector properties, and also
  365.          * a chance to reject the mode entirely.
  366.          */
  367.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  368.  
  369.                 if (encoder->crtc != crtc)
  370.                         continue;
  371.                 encoder_funcs = encoder->helper_private;
  372.                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
  373.                                                       adjusted_mode))) {
  374.                         goto done;
  375.                 }
  376.         }
  377.  
  378.         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
  379.                 goto done;
  380.         }
  381.         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
  382.  
  383.         /* Prepare the encoders and CRTCs before setting the mode. */
  384.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  385.  
  386.                 if (encoder->crtc != crtc)
  387.                         continue;
  388.                 encoder_funcs = encoder->helper_private;
  389.                 /* Disable the encoders as the first thing we do. */
  390.                 encoder_funcs->prepare(encoder);
  391.         }
  392.  
  393.         drm_crtc_prepare_encoders(dev);
  394.  
  395.         crtc_funcs->prepare(crtc);
  396.  
  397.         /* Set up the DPLL and any encoders state that needs to adjust or depend
  398.          * on the DPLL.
  399.          */
  400.         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
  401.         if (!ret)
  402.             goto done;
  403.  
  404.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  405.  
  406.                 if (encoder->crtc != crtc)
  407.                         continue;
  408.  
  409.                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
  410.                         encoder->base.id, drm_get_encoder_name(encoder),
  411.                         mode->base.id, mode->name);
  412.                 encoder_funcs = encoder->helper_private;
  413.                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
  414.         }
  415.  
  416.         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
  417.         crtc_funcs->commit(crtc);
  418.  
  419.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  420.  
  421.                 if (encoder->crtc != crtc)
  422.                         continue;
  423.  
  424.                 encoder_funcs = encoder->helper_private;
  425.                 encoder_funcs->commit(encoder);
  426.  
  427.         }
  428.  
  429.         /* Store real post-adjustment hardware mode. */
  430.         crtc->hwmode = *adjusted_mode;
  431.  
  432.         /* Calculate and store various constants which
  433.          * are later needed by vblank and swap-completion
  434.          * timestamping. They are derived from true hwmode.
  435.          */
  436.         drm_calc_timestamping_constants(crtc);
  437.  
  438.         /* FIXME: add subpixel order */
  439. done:
  440.         drm_mode_destroy(dev, adjusted_mode);
  441.         if (!ret) {
  442.                 crtc->hwmode = saved_hwmode;
  443.                 crtc->mode = saved_mode;
  444.                 crtc->x = saved_x;
  445.                 crtc->y = saved_y;
  446.         }
  447.  
  448.         return ret;
  449. }
  450. EXPORT_SYMBOL(drm_crtc_helper_set_mode);
  451.  
  452.  
  453. /**
  454.  * drm_crtc_helper_set_config - set a new config from userspace
  455.  * @crtc: CRTC to setup
  456.  * @crtc_info: user provided configuration
  457.  * @new_mode: new mode to set
  458.  * @connector_set: set of connectors for the new config
  459.  * @fb: new framebuffer
  460.  *
  461.  * LOCKING:
  462.  * Caller must hold mode config lock.
  463.  *
  464.  * Setup a new configuration, provided by the user in @crtc_info, and enable
  465.  * it.
  466.  *
  467.  * RETURNS:
  468.  * Zero. (FIXME)
  469.  */
  470. int drm_crtc_helper_set_config(struct drm_mode_set *set)
  471. {
  472.         struct drm_device *dev;
  473.         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
  474.         struct drm_encoder *save_encoders, *new_encoder, *encoder;
  475.         struct drm_framebuffer *old_fb = NULL;
  476.         bool mode_changed = false; /* if true do a full mode set */
  477.         bool fb_changed = false; /* if true and !mode_changed just do a flip */
  478.         struct drm_connector *save_connectors, *connector;
  479.         int count = 0, ro, fail = 0;
  480.         struct drm_crtc_helper_funcs *crtc_funcs;
  481.         int ret = 0;
  482.         int i;
  483.  
  484.         DRM_DEBUG_KMS("\n");
  485.  
  486.         if (!set)
  487.                 return -EINVAL;
  488.  
  489.         if (!set->crtc)
  490.                 return -EINVAL;
  491.  
  492.         if (!set->crtc->helper_private)
  493.                 return -EINVAL;
  494.  
  495.         crtc_funcs = set->crtc->helper_private;
  496.  
  497.         if (!set->mode)
  498.                 set->fb = NULL;
  499.  
  500.         if (set->fb) {
  501.                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
  502.                                 set->crtc->base.id, set->fb->base.id,
  503.                   (int)set->num_connectors, set->x, set->y);
  504.         } else {
  505.                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
  506.                 set->mode = NULL;
  507.                 set->num_connectors = 0;
  508.         }
  509.  
  510.         dev = set->crtc->dev;
  511.  
  512.         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
  513.          * connector data. */
  514.         save_crtcs = kzalloc(dev->mode_config.num_crtc *
  515.                              sizeof(struct drm_crtc), GFP_KERNEL);
  516.         if (!save_crtcs)
  517.                 return -ENOMEM;
  518.  
  519.         save_encoders = kzalloc(dev->mode_config.num_encoder *
  520.                                 sizeof(struct drm_encoder), GFP_KERNEL);
  521.         if (!save_encoders) {
  522.                 kfree(save_crtcs);
  523.                 return -ENOMEM;
  524.         }
  525.  
  526.         save_connectors = kzalloc(dev->mode_config.num_connector *
  527.                                 sizeof(struct drm_connector), GFP_KERNEL);
  528.         if (!save_connectors) {
  529.                 kfree(save_crtcs);
  530.                 kfree(save_encoders);
  531.                 return -ENOMEM;
  532.         }
  533.  
  534.         /* Copy data. Note that driver private data is not affected.
  535.          * Should anything bad happen only the expected state is
  536.          * restored, not the drivers personal bookkeeping.
  537.          */
  538.         count = 0;
  539.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  540.                 save_crtcs[count++] = *crtc;
  541.         }
  542.  
  543.         count = 0;
  544.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  545.                 save_encoders[count++] = *encoder;
  546.         }
  547.  
  548.         count = 0;
  549.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  550.                 save_connectors[count++] = *connector;
  551.         }
  552.  
  553.         /* We should be able to check here if the fb has the same properties
  554.          * and then just flip_or_move it */
  555.         if (set->crtc->fb != set->fb) {
  556.                 /* If we have no fb then treat it as a full mode set */
  557.                 if (set->crtc->fb == NULL) {
  558.                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
  559.                         mode_changed = true;
  560.                 } else if (set->fb == NULL) {
  561.                         mode_changed = true;
  562.                 } else
  563.                         fb_changed = true;
  564.         }
  565.  
  566.         if (set->x != set->crtc->x || set->y != set->crtc->y)
  567.                 fb_changed = true;
  568.  
  569.         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
  570.                 DRM_DEBUG_KMS("modes are different, full mode set\n");
  571.                 drm_mode_debug_printmodeline(&set->crtc->mode);
  572.                 drm_mode_debug_printmodeline(set->mode);
  573.                 mode_changed = true;
  574.         }
  575.  
  576.         /* a) traverse passed in connector list and get encoders for them */
  577.         count = 0;
  578.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  579.                 struct drm_connector_helper_funcs *connector_funcs =
  580.                         connector->helper_private;
  581.                 new_encoder = connector->encoder;
  582.                 for (ro = 0; ro < set->num_connectors; ro++) {
  583.                         if (set->connectors[ro] == connector) {
  584.                                 new_encoder = connector_funcs->best_encoder(connector);
  585.                                 /* if we can't get an encoder for a connector
  586.                                    we are setting now - then fail */
  587.                                 if (new_encoder == NULL)
  588.                                         /* don't break so fail path works correct */
  589.                                         fail = 1;
  590.                                 break;
  591.                         }
  592.                 }
  593.  
  594.                 if (new_encoder != connector->encoder) {
  595.                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
  596.                         mode_changed = true;
  597.                         /* If the encoder is reused for another connector, then
  598.                          * the appropriate crtc will be set later.
  599.                          */
  600.                         if (connector->encoder)
  601.                                 connector->encoder->crtc = NULL;
  602.                         connector->encoder = new_encoder;
  603.                 }
  604.         }
  605.  
  606.         if (fail) {
  607.                 ret = -EINVAL;
  608.                 goto fail;
  609.         }
  610.  
  611.         count = 0;
  612.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  613.                 if (!connector->encoder)
  614.                         continue;
  615.  
  616.                 if (connector->encoder->crtc == set->crtc)
  617.                         new_crtc = NULL;
  618.                 else
  619.                         new_crtc = connector->encoder->crtc;
  620.  
  621.                 for (ro = 0; ro < set->num_connectors; ro++) {
  622.                         if (set->connectors[ro] == connector)
  623.                                 new_crtc = set->crtc;
  624.                 }
  625.  
  626.                 /* Make sure the new CRTC will work with the encoder */
  627.                 if (new_crtc &&
  628.                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
  629.                         ret = -EINVAL;
  630.                         goto fail;
  631.                 }
  632.                 if (new_crtc != connector->encoder->crtc) {
  633.                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
  634.                         mode_changed = true;
  635.                         connector->encoder->crtc = new_crtc;
  636.                 }
  637.                 if (new_crtc) {
  638.                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
  639.                                 connector->base.id, drm_get_connector_name(connector),
  640.                                 new_crtc->base.id);
  641.                 } else {
  642.                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
  643.                                 connector->base.id, drm_get_connector_name(connector));
  644.                 }
  645.         }
  646.  
  647.         /* mode_set_base is not a required function */
  648.         if (fb_changed && !crtc_funcs->mode_set_base)
  649.                 mode_changed = true;
  650.  
  651.         if (mode_changed) {
  652.                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
  653.                 if (set->crtc->enabled) {
  654.                         DRM_DEBUG_KMS("attempting to set mode from"
  655.                                         " userspace\n");
  656.                         drm_mode_debug_printmodeline(set->mode);
  657.                         old_fb = set->crtc->fb;
  658.                         set->crtc->fb = set->fb;
  659.                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
  660.                                                       set->x, set->y,
  661.                                                       old_fb)) {
  662.                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
  663.                                           set->crtc->base.id);
  664.                                 set->crtc->fb = old_fb;
  665.                                 ret = -EINVAL;
  666.                                 goto fail;
  667.                         }
  668.                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
  669.                         for (i = 0; i < set->num_connectors; i++) {
  670.                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
  671.                                               drm_get_connector_name(set->connectors[i]));
  672.                                 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
  673.                         }
  674.                 }
  675.                 drm_helper_disable_unused_functions(dev);
  676.         } else if (fb_changed) {
  677.                 set->crtc->x = set->x;
  678.                 set->crtc->y = set->y;
  679.  
  680.                 old_fb = set->crtc->fb;
  681.                 if (set->crtc->fb != set->fb)
  682.                         set->crtc->fb = set->fb;
  683.                 ret = crtc_funcs->mode_set_base(set->crtc,
  684.                                                 set->x, set->y, old_fb);
  685.                 if (ret != 0) {
  686.                         set->crtc->fb = old_fb;
  687.                         goto fail;
  688.         }
  689.         }
  690.  
  691.         kfree(save_connectors);
  692.         kfree(save_encoders);
  693.         kfree(save_crtcs);
  694.         return 0;
  695.  
  696. fail:
  697.         /* Restore all previous data. */
  698.         count = 0;
  699.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  700.                 *crtc = save_crtcs[count++];
  701.         }
  702.  
  703.         count = 0;
  704.         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  705.                 *encoder = save_encoders[count++];
  706.         }
  707.  
  708.         count = 0;
  709.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  710.                 *connector = save_connectors[count++];
  711.         }
  712.  
  713.         kfree(save_connectors);
  714.         kfree(save_encoders);
  715.         kfree(save_crtcs);
  716.         return ret;
  717. }
  718. EXPORT_SYMBOL(drm_crtc_helper_set_config);
  719.  
  720. static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
  721. {
  722.         int dpms = DRM_MODE_DPMS_OFF;
  723.         struct drm_connector *connector;
  724.         struct drm_device *dev = encoder->dev;
  725.  
  726.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  727.                 if (connector->encoder == encoder)
  728.                         if (connector->dpms < dpms)
  729.                                 dpms = connector->dpms;
  730.         return dpms;
  731. }
  732.  
  733. static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
  734. {
  735.         int dpms = DRM_MODE_DPMS_OFF;
  736.         struct drm_connector *connector;
  737.         struct drm_device *dev = crtc->dev;
  738.  
  739.         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
  740.                 if (connector->encoder && connector->encoder->crtc == crtc)
  741.                         if (connector->dpms < dpms)
  742.                                 dpms = connector->dpms;
  743.         return dpms;
  744. }
  745.  
  746. /**
  747.  * drm_helper_connector_dpms
  748.  * @connector affected connector
  749.  * @mode DPMS mode
  750.  *
  751.  * Calls the low-level connector DPMS function, then
  752.  * calls appropriate encoder and crtc DPMS functions as well
  753.  */
  754. void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
  755. {
  756.         struct drm_encoder *encoder = connector->encoder;
  757.         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
  758.         int old_dpms;
  759.  
  760.         if (mode == connector->dpms)
  761.                 return;
  762.  
  763.         old_dpms = connector->dpms;
  764.         connector->dpms = mode;
  765.  
  766.         /* from off to on, do crtc then encoder */
  767.         if (mode < old_dpms) {
  768.                 if (crtc) {
  769.                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  770.                         if (crtc_funcs->dpms)
  771.                                 (*crtc_funcs->dpms) (crtc,
  772.                                                      drm_helper_choose_crtc_dpms(crtc));
  773.                 }
  774.                 if (encoder) {
  775.                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  776.                         if (encoder_funcs->dpms)
  777.                                 (*encoder_funcs->dpms) (encoder,
  778.                                                         drm_helper_choose_encoder_dpms(encoder));
  779.                 }
  780.         }
  781.  
  782.         /* from on to off, do encoder then crtc */
  783.         if (mode > old_dpms) {
  784.                 if (encoder) {
  785.                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
  786.                         if (encoder_funcs->dpms)
  787.                                 (*encoder_funcs->dpms) (encoder,
  788.                                                         drm_helper_choose_encoder_dpms(encoder));
  789.                 }
  790.                 if (crtc) {
  791.                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
  792.                         if (crtc_funcs->dpms)
  793.                                 (*crtc_funcs->dpms) (crtc,
  794.                                                      drm_helper_choose_crtc_dpms(crtc));
  795.                 }
  796.         }
  797.  
  798.         return;
  799. }
  800. EXPORT_SYMBOL(drm_helper_connector_dpms);
  801.  
  802. int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
  803.                                    struct drm_mode_fb_cmd *mode_cmd)
  804. {
  805.         fb->width = mode_cmd->width;
  806.         fb->height = mode_cmd->height;
  807.         fb->pitch = mode_cmd->pitch;
  808.         fb->bits_per_pixel = mode_cmd->bpp;
  809.         fb->depth = mode_cmd->depth;
  810.  
  811.         return 0;
  812. }
  813. EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
  814.  
  815. int drm_helper_resume_force_mode(struct drm_device *dev)
  816. {
  817.         struct drm_crtc *crtc;
  818.         struct drm_encoder *encoder;
  819.         struct drm_encoder_helper_funcs *encoder_funcs;
  820.         struct drm_crtc_helper_funcs *crtc_funcs;
  821.         int ret;
  822.  
  823.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  824.  
  825.        if (!crtc->enabled)
  826.            continue;
  827.  
  828.                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
  829.                                                crtc->x, crtc->y, crtc->fb);
  830.  
  831.                 if (ret == false)
  832.                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
  833.  
  834.                 /* Turn off outputs that were already powered off */
  835.                 if (drm_helper_choose_crtc_dpms(crtc)) {
  836.                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
  837.  
  838.                                 if(encoder->crtc != crtc)
  839.                                         continue;
  840.  
  841.                                 encoder_funcs = encoder->helper_private;
  842.                                 if (encoder_funcs->dpms)
  843.                                         (*encoder_funcs->dpms) (encoder,
  844.                                                                 drm_helper_choose_encoder_dpms(encoder));
  845.                         }
  846.  
  847.                                 crtc_funcs = crtc->helper_private;
  848.                                 if (crtc_funcs->dpms)
  849.                                         (*crtc_funcs->dpms) (crtc,
  850.                                                              drm_helper_choose_crtc_dpms(crtc));
  851.                         }
  852.                 }
  853.         /* disable the unused connectors while restoring the modesetting */
  854.         drm_helper_disable_unused_functions(dev);
  855.         return 0;
  856. }
  857. EXPORT_SYMBOL(drm_helper_resume_force_mode);
  858.  
  859. #if 0
  860.  
  861. #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
  862. static void output_poll_execute(struct work_struct *work)
  863. {
  864.         struct delayed_work *delayed_work = to_delayed_work(work);
  865.         struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
  866.         struct drm_connector *connector;
  867.         enum drm_connector_status old_status;
  868.         bool repoll = false, changed = false;
  869.  
  870.         if (!drm_kms_helper_poll)
  871.                 return;
  872.  
  873.         mutex_lock(&dev->mode_config.mutex);
  874.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  875.  
  876.                 /* if this is HPD or polled don't check it -
  877.                    TV out for instance */
  878.                 if (!connector->polled)
  879.                         continue;
  880.  
  881.                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
  882.                         repoll = true;
  883.  
  884.                 old_status = connector->status;
  885.                 /* if we are connected and don't want to poll for disconnect
  886.                    skip it */
  887.                 if (old_status == connector_status_connected &&
  888.                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
  889.                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
  890.                         continue;
  891.  
  892.                 connector->status = connector->funcs->detect(connector, false);
  893.                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
  894.                               connector->base.id,
  895.                               drm_get_connector_name(connector),
  896.                               old_status, connector->status);
  897.                 if (old_status != connector->status)
  898.                         changed = true;
  899.         }
  900.  
  901.         mutex_unlock(&dev->mode_config.mutex);
  902.  
  903.         if (changed) {
  904.                 /* send a uevent + call fbdev */
  905.                 drm_sysfs_hotplug_event(dev);
  906.                 if (dev->mode_config.funcs->output_poll_changed)
  907.                         dev->mode_config.funcs->output_poll_changed(dev);
  908.         }
  909.  
  910.         if (repoll)
  911.                 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
  912. }
  913.  
  914. void drm_kms_helper_poll_disable(struct drm_device *dev)
  915. {
  916.         if (!dev->mode_config.poll_enabled)
  917.                 return;
  918.         cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
  919. }
  920. EXPORT_SYMBOL(drm_kms_helper_poll_disable);
  921.  
  922. void drm_kms_helper_poll_enable(struct drm_device *dev)
  923. {
  924.         bool poll = false;
  925.         struct drm_connector *connector;
  926.  
  927.         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
  928.                 return;
  929.  
  930.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  931.                 if (connector->polled)
  932.                         poll = true;
  933.         }
  934.  
  935.         if (poll)
  936.                 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
  937. }
  938. EXPORT_SYMBOL(drm_kms_helper_poll_enable);
  939.  
  940. void drm_kms_helper_poll_init(struct drm_device *dev)
  941. {
  942.         INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
  943.         dev->mode_config.poll_enabled = true;
  944.  
  945.         drm_kms_helper_poll_enable(dev);
  946. }
  947. EXPORT_SYMBOL(drm_kms_helper_poll_init);
  948.  
  949. void drm_kms_helper_poll_fini(struct drm_device *dev)
  950. {
  951.         drm_kms_helper_poll_disable(dev);
  952. }
  953. EXPORT_SYMBOL(drm_kms_helper_poll_fini);
  954.  
  955. void drm_helper_hpd_irq_event(struct drm_device *dev)
  956. {
  957.         if (!dev->mode_config.poll_enabled)
  958.                 return;
  959.  
  960.         /* kill timer and schedule immediate execution, this doesn't block */
  961.         cancel_delayed_work(&dev->mode_config.output_poll_work);
  962.         if (drm_kms_helper_poll)
  963.         queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
  964. }
  965. EXPORT_SYMBOL(drm_helper_hpd_irq_event);
  966.  
  967.  
  968. #endif
  969.