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  1. /*
  2.  * Copyright © 2007 David Airlie
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *     David Airlie
  25.  */
  26.  
  27. #include <linux/async.h>
  28. #include <linux/module.h>
  29. #include <linux/kernel.h>
  30. #include <linux/errno.h>
  31. #include <linux/string.h>
  32. //#include <linux/mm.h>
  33. //#include <linux/tty.h>
  34. #include <linux/sysrq.h>
  35. #include <linux/delay.h>
  36. #include <linux/fb.h>
  37. //#include <linux/init.h>
  38. //#include <linux/vga_switcheroo.h>
  39.  
  40. #include <drm/drmP.h>
  41. #include <drm/drm_crtc.h>
  42. #include <drm/drm_fb_helper.h>
  43. #include "intel_drv.h"
  44. #include <drm/i915_drm.h>
  45. #include "i915_drv.h"
  46.  
  47.  
  48. struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
  49. {
  50. #define BYTES_PER_LONG (BITS_PER_LONG/8)
  51. #define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
  52.     int fb_info_size = sizeof(struct fb_info);
  53.     struct fb_info *info;
  54.     char *p;
  55.  
  56.     if (size)
  57.         fb_info_size += PADDING;
  58.  
  59.     p = kzalloc(fb_info_size + size, GFP_KERNEL);
  60.  
  61.     if (!p)
  62.         return NULL;
  63.  
  64.     info = (struct fb_info *) p;
  65.  
  66.     if (size)
  67.         info->par = p + fb_info_size;
  68.  
  69.     return info;
  70. #undef PADDING
  71. #undef BYTES_PER_LONG
  72. }
  73.  
  74. static int intel_fbdev_set_par(struct fb_info *info)
  75. {
  76.         struct drm_fb_helper *fb_helper = info->par;
  77.         struct intel_fbdev *ifbdev =
  78.                 container_of(fb_helper, struct intel_fbdev, helper);
  79.         int ret;
  80.  
  81.         ret = drm_fb_helper_set_par(info);
  82.  
  83.         if (ret == 0) {
  84.                 /*
  85.                  * FIXME: fbdev presumes that all callbacks also work from
  86.                  * atomic contexts and relies on that for emergency oops
  87.                  * printing. KMS totally doesn't do that and the locking here is
  88.                  * by far not the only place this goes wrong.  Ignore this for
  89.                  * now until we solve this for real.
  90.                  */
  91.                 mutex_lock(&fb_helper->dev->struct_mutex);
  92.                 ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,
  93.                                                         true);
  94.                 mutex_unlock(&fb_helper->dev->struct_mutex);
  95.         }
  96.  
  97.         return ret;
  98. }
  99.  
  100. static struct fb_ops intelfb_ops = {
  101.         .owner = THIS_MODULE,
  102.         .fb_check_var = drm_fb_helper_check_var,
  103.         .fb_set_par = intel_fbdev_set_par,
  104. //   .fb_fillrect = cfb_fillrect,
  105. //   .fb_copyarea = cfb_copyarea,
  106. //   .fb_imageblit = cfb_imageblit,
  107. //   .fb_pan_display = drm_fb_helper_pan_display,
  108.         .fb_blank = drm_fb_helper_blank,
  109. //   .fb_setcmap = drm_fb_helper_setcmap,
  110. //   .fb_debug_enter = drm_fb_helper_debug_enter,
  111. //   .fb_debug_leave = drm_fb_helper_debug_leave,
  112. };
  113.  
  114. static int intelfb_alloc(struct drm_fb_helper *helper,
  115.                           struct drm_fb_helper_surface_size *sizes)
  116. {
  117.         struct intel_fbdev *ifbdev =
  118.                 container_of(helper, struct intel_fbdev, helper);
  119.         struct drm_framebuffer *fb;
  120.         struct drm_device *dev = helper->dev;
  121.         struct drm_mode_fb_cmd2 mode_cmd = {};
  122.         struct drm_i915_gem_object *obj;
  123.         int size, ret;
  124.  
  125.         /* we don't do packed 24bpp */
  126.         if (sizes->surface_bpp == 24)
  127.                 sizes->surface_bpp = 32;
  128.  
  129.         mode_cmd.width = sizes->surface_width;
  130.         mode_cmd.height = sizes->surface_height;
  131.  
  132.         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
  133.                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
  134.         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  135.                                                           sizes->surface_depth);
  136.  
  137.         size = mode_cmd.pitches[0] * mode_cmd.height;
  138.         size = ALIGN(size, PAGE_SIZE);
  139.         obj = main_fb_obj;
  140.     obj->stride = mode_cmd.pitches[0];
  141.         if (!obj) {
  142.                 DRM_ERROR("failed to allocate framebuffer\n");
  143.                 ret = -ENOMEM;
  144.                 goto out;
  145.         }
  146.  
  147.         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
  148.         if (IS_ERR(fb)) {
  149.                 ret = PTR_ERR(fb);
  150.                 goto out_unref;
  151.         }
  152.  
  153.         /* Flush everything out, we'll be doing GTT only from now on */
  154.         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL);
  155.         if (ret) {
  156.                 DRM_ERROR("failed to pin obj: %d\n", ret);
  157.                 goto out_fb;
  158.         }
  159.  
  160.         ifbdev->fb = to_intel_framebuffer(fb);
  161.  
  162.         return 0;
  163.  
  164. out_fb:
  165.         drm_framebuffer_remove(fb);
  166. out_unref:
  167.         drm_gem_object_unreference(&obj->base);
  168. out:
  169.         return ret;
  170. }
  171.  
  172. static int intelfb_create(struct drm_fb_helper *helper,
  173.                           struct drm_fb_helper_surface_size *sizes)
  174. {
  175.         struct intel_fbdev *ifbdev =
  176.                 container_of(helper, struct intel_fbdev, helper);
  177.         struct intel_framebuffer *intel_fb = ifbdev->fb;
  178.         struct drm_device *dev = helper->dev;
  179.         struct drm_i915_private *dev_priv = dev->dev_private;
  180.         struct fb_info *info;
  181.         struct drm_framebuffer *fb;
  182.         struct drm_i915_gem_object *obj;
  183.         int size, ret;
  184.         bool prealloc = false;
  185.  
  186.         mutex_lock(&dev->struct_mutex);
  187.  
  188. #if 0
  189.         if (intel_fb &&
  190.             (sizes->fb_width > intel_fb->base.width ||
  191.              sizes->fb_height > intel_fb->base.height)) {
  192.                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
  193.                               " releasing it\n",
  194.                               intel_fb->base.width, intel_fb->base.height,
  195.                               sizes->fb_width, sizes->fb_height);
  196.                 drm_framebuffer_unreference(&intel_fb->base);
  197.                 intel_fb = ifbdev->fb = NULL;
  198.         }
  199. #endif
  200.  
  201.         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
  202.                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
  203.                 ret = intelfb_alloc(helper, sizes);
  204.                 if (ret)
  205.                         goto out_unlock;
  206.                 intel_fb = ifbdev->fb;
  207.         } else {
  208.                 DRM_DEBUG_KMS("re-using BIOS fb\n");
  209.                 prealloc = true;
  210.                 sizes->fb_width = intel_fb->base.width;
  211.                 sizes->fb_height = intel_fb->base.height;
  212.         }
  213.  
  214.         obj = intel_fb->obj;
  215.         size = obj->base.size;
  216.  
  217.         info = framebuffer_alloc(0, &dev->pdev->dev);
  218.         if (!info) {
  219.                 ret = -ENOMEM;
  220.                 goto out_unpin;
  221.         }
  222.  
  223.         info->par = helper;
  224.  
  225.         fb = &ifbdev->fb->base;
  226.  
  227.         ifbdev->helper.fb = fb;
  228.         ifbdev->helper.fbdev = info;
  229.  
  230.     strcpy(info->fix.id, "inteldrmfb");
  231.  
  232.     info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
  233.     info->fbops = &intelfb_ops;
  234.  
  235.     /* setup aperture base/size for vesafb takeover */
  236.         info->apertures = alloc_apertures(1);
  237.         if (!info->apertures) {
  238.                 ret = -ENOMEM;
  239.                 goto out_unpin;
  240.         }
  241.         info->apertures->ranges[0].base = dev->mode_config.fb_base;
  242.         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
  243.  
  244.  
  245.         info->screen_base = (void*) 0xFE000000;
  246.         info->screen_size = size;
  247.  
  248.         /* This driver doesn't need a VT switch to restore the mode on resume */
  249.         info->skip_vt_switch = true;
  250.  
  251.         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
  252.         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
  253.  
  254.         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
  255.  
  256.         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
  257.                       fb->width, fb->height,
  258.                       i915_gem_obj_ggtt_offset(obj), obj);
  259.  
  260.         mutex_unlock(&dev->struct_mutex);
  261.         return 0;
  262.  
  263. out_unpin:
  264.         i915_gem_object_ggtt_unpin(obj);
  265.         drm_gem_object_unreference(&obj->base);
  266. out_unlock:
  267.         mutex_unlock(&dev->struct_mutex);
  268.         return ret;
  269. }
  270.  
  271. /** Sets the color ramps on behalf of RandR */
  272. static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
  273.                                     u16 blue, int regno)
  274. {
  275.         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  276.  
  277.         intel_crtc->lut_r[regno] = red >> 8;
  278.         intel_crtc->lut_g[regno] = green >> 8;
  279.         intel_crtc->lut_b[regno] = blue >> 8;
  280. }
  281.  
  282. static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
  283.                                     u16 *blue, int regno)
  284. {
  285.         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  286.  
  287.         *red = intel_crtc->lut_r[regno] << 8;
  288.         *green = intel_crtc->lut_g[regno] << 8;
  289.         *blue = intel_crtc->lut_b[regno] << 8;
  290. }
  291.  
  292. static struct drm_fb_helper_crtc *
  293. intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
  294. {
  295.         int i;
  296.  
  297.         for (i = 0; i < fb_helper->crtc_count; i++)
  298.                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
  299.                         return &fb_helper->crtc_info[i];
  300.  
  301.         return NULL;
  302. }
  303.  
  304. /*
  305.  * Try to read the BIOS display configuration and use it for the initial
  306.  * fb configuration.
  307.  *
  308.  * The BIOS or boot loader will generally create an initial display
  309.  * configuration for us that includes some set of active pipes and displays.
  310.  * This routine tries to figure out which pipes and connectors are active
  311.  * and stuffs them into the crtcs and modes array given to us by the
  312.  * drm_fb_helper code.
  313.  *
  314.  * The overall sequence is:
  315.  *   intel_fbdev_init - from driver load
  316.  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
  317.  *     drm_fb_helper_init - build fb helper structs
  318.  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
  319.  *   intel_fbdev_initial_config - apply the config
  320.  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
  321.  *         drm_setup_crtcs - build crtc config for fbdev
  322.  *           intel_fb_initial_config - find active connectors etc
  323.  *         drm_fb_helper_single_fb_probe - set up fbdev
  324.  *           intelfb_create - re-use or alloc fb, build out fbdev structs
  325.  *
  326.  * Note that we don't make special consideration whether we could actually
  327.  * switch to the selected modes without a full modeset. E.g. when the display
  328.  * is in VGA mode we need to recalculate watermarks and set a new high-res
  329.  * framebuffer anyway.
  330.  */
  331. static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
  332.                                     struct drm_fb_helper_crtc **crtcs,
  333.                                     struct drm_display_mode **modes,
  334.                                     struct drm_fb_offset *offsets,
  335.                                     bool *enabled, int width, int height)
  336. {
  337.         struct drm_device *dev = fb_helper->dev;
  338.         int i, j;
  339.         bool *save_enabled;
  340.         bool fallback = true;
  341.         int num_connectors_enabled = 0;
  342.         int num_connectors_detected = 0;
  343.         uint64_t conn_configured = 0, mask;
  344.         int pass = 0;
  345.  
  346.         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
  347.                                GFP_KERNEL);
  348.         if (!save_enabled)
  349.                 return false;
  350.  
  351.         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
  352.         mask = (1 << fb_helper->connector_count) - 1;
  353. retry:
  354.         for (i = 0; i < fb_helper->connector_count; i++) {
  355.                 struct drm_fb_helper_connector *fb_conn;
  356.                 struct drm_connector *connector;
  357.                 struct drm_encoder *encoder;
  358.                 struct drm_fb_helper_crtc *new_crtc;
  359.  
  360.                 fb_conn = fb_helper->connector_info[i];
  361.                 connector = fb_conn->connector;
  362.  
  363.                 if (conn_configured & (1 << i))
  364.                         continue;
  365.  
  366.                 if (pass == 0 && !connector->has_tile)
  367.                         continue;
  368.  
  369.                 if (connector->status == connector_status_connected)
  370.                         num_connectors_detected++;
  371.  
  372.                 if (!enabled[i]) {
  373.                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
  374.                                       connector->name);
  375.                         conn_configured |= (1 << i);
  376.                         continue;
  377.                 }
  378.  
  379.                 if (connector->force == DRM_FORCE_OFF) {
  380.                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
  381.                                       connector->name);
  382.                         enabled[i] = false;
  383.                         continue;
  384.                 }
  385.  
  386.                 encoder = connector->encoder;
  387.                 if (!encoder || WARN_ON(!encoder->crtc)) {
  388.                         if (connector->force > DRM_FORCE_OFF)
  389.                                 goto bail;
  390.  
  391.                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
  392.                                       connector->name);
  393.                         enabled[i] = false;
  394.                         conn_configured |= (1 << i);
  395.                         continue;
  396.                 }
  397.  
  398.                 num_connectors_enabled++;
  399.  
  400.                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
  401.  
  402.                 /*
  403.                  * Make sure we're not trying to drive multiple connectors
  404.                  * with a single CRTC, since our cloning support may not
  405.                  * match the BIOS.
  406.                  */
  407.                 for (j = 0; j < fb_helper->connector_count; j++) {
  408.                         if (crtcs[j] == new_crtc) {
  409.                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
  410.                                 goto bail;
  411.                         }
  412.                 }
  413.  
  414.                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
  415.                               connector->name);
  416.  
  417.                 /* go for command line mode first */
  418.                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
  419.  
  420.                 /* try for preferred next */
  421.                 if (!modes[i]) {
  422.                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
  423.                                       connector->name, connector->has_tile);
  424.                         modes[i] = drm_has_preferred_mode(fb_conn, width,
  425.                                                           height);
  426.                 }
  427.  
  428.                 /* No preferred mode marked by the EDID? Are there any modes? */
  429.                 if (!modes[i] && !list_empty(&connector->modes)) {
  430.                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
  431.                                       connector->name);
  432.                         modes[i] = list_first_entry(&connector->modes,
  433.                                                     struct drm_display_mode,
  434.                                                     head);
  435.                 }
  436.  
  437.                 /* last resort: use current mode */
  438.                 if (!modes[i]) {
  439.                         /*
  440.                          * IMPORTANT: We want to use the adjusted mode (i.e.
  441.                          * after the panel fitter upscaling) as the initial
  442.                          * config, not the input mode, which is what crtc->mode
  443.                          * usually contains. But since our current fastboot
  444.                          * code puts a mode derived from the post-pfit timings
  445.                          * into crtc->mode this works out correctly. We don't
  446.                          * use hwmode anywhere right now, so use it for this
  447.                          * since the fb helper layer wants a pointer to
  448.                          * something we own.
  449.                          */
  450.                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
  451.                                       connector->name);
  452.                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
  453.                                                     &to_intel_crtc(encoder->crtc)->config);
  454.                         modes[i] = &encoder->crtc->hwmode;
  455.                 }
  456.                 crtcs[i] = new_crtc;
  457.  
  458.                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
  459.                               connector->name,
  460.                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
  461.                               encoder->crtc->base.id,
  462.                               modes[i]->hdisplay, modes[i]->vdisplay,
  463.                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
  464.  
  465.                 fallback = false;
  466.                 conn_configured |= (1 << i);
  467.         }
  468.  
  469.         if ((conn_configured & mask) != mask) {
  470.                 pass++;
  471.                 goto retry;
  472.         }
  473.  
  474.         /*
  475.          * If the BIOS didn't enable everything it could, fall back to have the
  476.          * same user experiencing of lighting up as much as possible like the
  477.          * fbdev helper library.
  478.          */
  479.         if (num_connectors_enabled != num_connectors_detected &&
  480.             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
  481.                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
  482.                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
  483.                               num_connectors_detected);
  484.                 fallback = true;
  485.         }
  486.  
  487.         if (fallback) {
  488. bail:
  489.                 DRM_DEBUG_KMS("Not using firmware configuration\n");
  490.                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
  491.                 kfree(save_enabled);
  492.                 return false;
  493.         }
  494.  
  495.         kfree(save_enabled);
  496.         return true;
  497. }
  498.  
  499. static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
  500.         .initial_config = intel_fb_initial_config,
  501.         .gamma_set = intel_crtc_fb_gamma_set,
  502.         .gamma_get = intel_crtc_fb_gamma_get,
  503.         .fb_probe = intelfb_create,
  504. };
  505.  
  506. /*
  507.  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
  508.  * The core display code will have read out the current plane configuration,
  509.  * so we use that to figure out if there's an object for us to use as the
  510.  * fb, and if so, we re-use it for the fbdev configuration.
  511.  *
  512.  * Note we only support a single fb shared across pipes for boot (mostly for
  513.  * fbcon), so we just find the biggest and use that.
  514.  */
  515. static bool intel_fbdev_init_bios(struct drm_device *dev,
  516.                                  struct intel_fbdev *ifbdev)
  517. {
  518.         struct intel_framebuffer *fb = NULL;
  519.         struct drm_crtc *crtc;
  520.         struct intel_crtc *intel_crtc;
  521.         struct intel_plane_config *plane_config = NULL;
  522.         unsigned int max_size = 0;
  523.  
  524.         if (!i915.fastboot)
  525.                 return false;
  526.  
  527.         /* Find the largest fb */
  528.         for_each_crtc(dev, crtc) {
  529.                 intel_crtc = to_intel_crtc(crtc);
  530.  
  531.                 if (!intel_crtc->active || !crtc->primary->fb) {
  532.                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
  533.                                       pipe_name(intel_crtc->pipe));
  534.                         continue;
  535.                 }
  536.  
  537.                 if (intel_crtc->plane_config.size > max_size) {
  538.                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
  539.                                       pipe_name(intel_crtc->pipe));
  540.                         plane_config = &intel_crtc->plane_config;
  541.                         fb = to_intel_framebuffer(crtc->primary->fb);
  542.                         max_size = plane_config->size;
  543.                 }
  544.         }
  545.  
  546.         if (!fb) {
  547.                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
  548.                 goto out;
  549.         }
  550.  
  551.         /* Now make sure all the pipes will fit into it */
  552.         for_each_crtc(dev, crtc) {
  553.                 unsigned int cur_size;
  554.  
  555.                 intel_crtc = to_intel_crtc(crtc);
  556.  
  557.                 if (!intel_crtc->active) {
  558.                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
  559.                                       pipe_name(intel_crtc->pipe));
  560.                         continue;
  561.                 }
  562.  
  563.                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
  564.                               pipe_name(intel_crtc->pipe));
  565.  
  566.                 /*
  567.                  * See if the plane fb we found above will fit on this
  568.                  * pipe.  Note we need to use the selected fb's pitch and bpp
  569.                  * rather than the current pipe's, since they differ.
  570.                  */
  571.                 cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay;
  572.                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
  573.                 if (fb->base.pitches[0] < cur_size) {
  574.                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
  575.                                       pipe_name(intel_crtc->pipe),
  576.                                       cur_size, fb->base.pitches[0]);
  577.                         plane_config = NULL;
  578.                         fb = NULL;
  579.                         break;
  580.                 }
  581.  
  582.                 cur_size = intel_crtc->config.adjusted_mode.crtc_vdisplay;
  583.                 cur_size = ALIGN(cur_size, plane_config->tiled ? (IS_GEN2(dev) ? 16 : 8) : 1);
  584.                 cur_size *= fb->base.pitches[0];
  585.                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
  586.                               pipe_name(intel_crtc->pipe),
  587.                               intel_crtc->config.adjusted_mode.crtc_hdisplay,
  588.                               intel_crtc->config.adjusted_mode.crtc_vdisplay,
  589.                               fb->base.bits_per_pixel,
  590.                               cur_size);
  591.  
  592.                 if (cur_size > max_size) {
  593.                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
  594.                                       pipe_name(intel_crtc->pipe),
  595.                                       cur_size, max_size);
  596.                         plane_config = NULL;
  597.                         fb = NULL;
  598.                         break;
  599.                 }
  600.  
  601.                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
  602.                               pipe_name(intel_crtc->pipe),
  603.                               max_size, cur_size);
  604.         }
  605.  
  606.         if (!fb) {
  607.                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
  608.                 goto out;
  609.         }
  610.  
  611.         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
  612.         ifbdev->fb = fb;
  613.  
  614.         drm_framebuffer_reference(&ifbdev->fb->base);
  615.  
  616.         /* Final pass to check if any active pipes don't have fbs */
  617.         for_each_crtc(dev, crtc) {
  618.                 intel_crtc = to_intel_crtc(crtc);
  619.  
  620.                 if (!intel_crtc->active)
  621.                         continue;
  622.  
  623.                 WARN(!crtc->primary->fb,
  624.                      "re-used BIOS config but lost an fb on crtc %d\n",
  625.                      crtc->base.id);
  626.         }
  627.  
  628.  
  629.         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
  630.         return true;
  631.  
  632. out:
  633.  
  634.         return false;
  635. }
  636.  
  637. int intel_fbdev_init(struct drm_device *dev)
  638. {
  639.         struct intel_fbdev *ifbdev;
  640.         struct drm_i915_private *dev_priv = dev->dev_private;
  641.         int ret;
  642.  
  643.         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
  644.                 return -ENODEV;
  645.  
  646.         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
  647.         if (ifbdev == NULL)
  648.                 return -ENOMEM;
  649.  
  650.         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
  651.  
  652.         if (!intel_fbdev_init_bios(dev, ifbdev))
  653.                 ifbdev->preferred_bpp = 32;
  654.  
  655.         ret = drm_fb_helper_init(dev, &ifbdev->helper,
  656.                                  INTEL_INFO(dev)->num_pipes, 4);
  657.         if (ret) {
  658.                 kfree(ifbdev);
  659.                 return ret;
  660.         }
  661.  
  662.         dev_priv->fbdev = ifbdev;
  663.         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
  664.  
  665.     return 0;
  666. }
  667.  
  668. void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
  669. {
  670.         struct drm_i915_private *dev_priv = data;
  671.         struct intel_fbdev *ifbdev = dev_priv->fbdev;
  672.  
  673.         /* Due to peculiar init order wrt to hpd handling this is separate. */
  674.         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
  675. }
  676.  
  677.  
  678. void intel_fbdev_output_poll_changed(struct drm_device *dev)
  679. {
  680.         struct drm_i915_private *dev_priv = dev->dev_private;
  681.         if (dev_priv->fbdev)
  682.                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
  683. }
  684.