OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​i915/​display/​intel_fbdev.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * Copyright © 2007 David Airlie
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  *
  * Authors:
  *     David Airlie
  */
 
 #include <linux/async.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/sysrq.h>
 #include <linux/tty.h>
 #include <linux/vga_switcheroo.h>
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 
 #include "gem/i915_gem_lmem.h"
 
 #include "i915_drv.h"
 #include "intel_display_types.h"
 #include "intel_fb.h"
 #include "intel_fb_pin.h"
 #include "intel_fbdev.h"
 #include "intel_frontbuffer.h"
 
 struct intel_fbdev {
     struct drm_fb_helper helper;
     struct intel_framebuffer *fb;
     struct i915_vma *vma;
     unsigned long vma_flags;
     async_cookie_t cookie;
     int preferred_bpp;
 
     /* Whether or not fbdev hpd processing is temporarily suspended */
     bool hpd_suspended: 1;
     /* Set when a hotplug was received while HPD processing was suspended */
     bool hpd_waiting: 1;
 
     /* Protects hpd_suspended */
     struct mutex hpd_lock;
 };
 
 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
 {
     return ifbdev->fb->frontbuffer;
 }
 
 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
 {
     intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
 }
 
 static int intel_fbdev_set_par(struct fb_info *info)
 {
     struct drm_fb_helper *fb_helper = info->par;
     struct intel_fbdev *ifbdev =
         container_of(fb_helper, struct intel_fbdev, helper);
     int ret;
 
     ret = drm_fb_helper_set_par(info);
     if (ret == 0)
         intel_fbdev_invalidate(ifbdev);
 
     return ret;
 }
 
 static int intel_fbdev_blank(int blank, struct fb_info *info)
 {
     struct drm_fb_helper *fb_helper = info->par;
     struct intel_fbdev *ifbdev =
         container_of(fb_helper, struct intel_fbdev, helper);
     int ret;
 
     ret = drm_fb_helper_blank(blank, info);
     if (ret == 0)
         intel_fbdev_invalidate(ifbdev);
 
     return ret;
 }
 
 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
                    struct fb_info *info)
 {
     struct drm_fb_helper *fb_helper = info->par;
     struct intel_fbdev *ifbdev =
         container_of(fb_helper, struct intel_fbdev, helper);
     int ret;
 
     ret = drm_fb_helper_pan_display(var, info);
     if (ret == 0)
         intel_fbdev_invalidate(ifbdev);
 
     return ret;
 }
 
 static const struct fb_ops intelfb_ops = {
     .owner = THIS_MODULE,
     DRM_FB_HELPER_DEFAULT_OPS,
     .fb_set_par = intel_fbdev_set_par,
     .fb_fillrect = drm_fb_helper_cfb_fillrect,
     .fb_copyarea = drm_fb_helper_cfb_copyarea,
     .fb_imageblit = drm_fb_helper_cfb_imageblit,
     .fb_pan_display = intel_fbdev_pan_display,
     .fb_blank = intel_fbdev_blank,
 };
 
 static int intelfb_alloc(struct drm_fb_helper *helper,
              struct drm_fb_helper_surface_size *sizes)
 {
     struct intel_fbdev *ifbdev =
         container_of(helper, struct intel_fbdev, helper);
     struct drm_framebuffer *fb;
     struct drm_device *dev = helper->dev;
     struct drm_i915_private *dev_priv = to_i915(dev);
     struct drm_mode_fb_cmd2 mode_cmd = {};
     struct drm_i915_gem_object *obj;
     int size;
 
     /* we don't do packed 24bpp */
     if (sizes->surface_bpp == 24)
         sizes->surface_bpp = 32;
 
     mode_cmd.width = sizes->surface_width;
     mode_cmd.height = sizes->surface_height;
 
     mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
     mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
                               sizes->surface_depth);
 
     size = mode_cmd.pitches[0] * mode_cmd.height;
     size = PAGE_ALIGN(size);
 
     obj = ERR_PTR(-ENODEV);
     if (HAS_LMEM(dev_priv)) {
         obj = i915_gem_object_create_lmem(dev_priv, size,
                           I915_BO_ALLOC_CONTIGUOUS);
     } else {
         /*
          * If the FB is too big, just don't use it since fbdev is not very
          * important and we should probably use that space with FBC or other
          * features.
          */
         if (size * 2 < dev_priv->stolen_usable_size)
             obj = i915_gem_object_create_stolen(dev_priv, size);
         if (IS_ERR(obj))
             obj = i915_gem_object_create_shmem(dev_priv, size);
     }
 
     if (IS_ERR(obj)) {
         drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
         return PTR_ERR(obj);
     }
 
     fb = intel_framebuffer_create(obj, &mode_cmd);
     i915_gem_object_put(obj);
     if (IS_ERR(fb))
         return PTR_ERR(fb);
 
     ifbdev->fb = to_intel_framebuffer(fb);
     return 0;
 }
 
 static int intelfb_create(struct drm_fb_helper *helper,
               struct drm_fb_helper_surface_size *sizes)
 {
     struct intel_fbdev *ifbdev =
         container_of(helper, struct intel_fbdev, helper);
     struct intel_framebuffer *intel_fb = ifbdev->fb;
     struct drm_device *dev = helper->dev;
     struct drm_i915_private *dev_priv = to_i915(dev);
     struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
     struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
     const struct i915_ggtt_view view = {
         .type = I915_GGTT_VIEW_NORMAL,
     };
     intel_wakeref_t wakeref;
     struct fb_info *info;
     struct i915_vma *vma;
     unsigned long flags = 0;
     bool prealloc = false;
     void __iomem *vaddr;
     struct drm_i915_gem_object *obj;
     int ret;
 
     if (intel_fb &&
         (sizes->fb_width > intel_fb->base.width ||
          sizes->fb_height > intel_fb->base.height)) {
         drm_dbg_kms(&dev_priv->drm,
                 "BIOS fb too small (%dx%d), we require (%dx%d),"
                 " releasing it\n",
                 intel_fb->base.width, intel_fb->base.height,
                 sizes->fb_width, sizes->fb_height);
         drm_framebuffer_put(&intel_fb->base);
         intel_fb = ifbdev->fb = NULL;
     }
     if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
         drm_dbg_kms(&dev_priv->drm,
                 "no BIOS fb, allocating a new one\n");
         ret = intelfb_alloc(helper, sizes);
         if (ret)
             return ret;
         intel_fb = ifbdev->fb;
     } else {
         drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
         prealloc = true;
         sizes->fb_width = intel_fb->base.width;
         sizes->fb_height = intel_fb->base.height;
     }
 
     wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 
     /* Pin the GGTT vma for our access via info->screen_base.
      * This also validates that any existing fb inherited from the
      * BIOS is suitable for own access.
      */
     vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
                      &view, false, &flags);
     if (IS_ERR(vma)) {
         ret = PTR_ERR(vma);
         goto out_unlock;
     }
 
     info = drm_fb_helper_alloc_fbi(helper);
     if (IS_ERR(info)) {
         drm_err(&dev_priv->drm, "Failed to allocate fb_info\n");
         ret = PTR_ERR(info);
         goto out_unpin;
     }
 
     ifbdev->helper.fb = &ifbdev->fb->base;
 
     info->fbops = &intelfb_ops;
 
     /* setup aperture base/size for vesafb takeover */
     obj = intel_fb_obj(&intel_fb->base);
     if (i915_gem_object_is_lmem(obj)) {
         struct intel_memory_region *mem = obj->mm.region;
 
         info->apertures->ranges[0].base = mem->io_start;
         info->apertures->ranges[0].size = mem->io_size;
 
         /* Use fbdev's framebuffer from lmem for discrete */
         info->fix.smem_start =
             (unsigned long)(mem->io_start +
                     i915_gem_object_get_dma_address(obj, 0));
         info->fix.smem_len = obj->base.size;
     } else {
         info->apertures->ranges[0].base = ggtt->gmadr.start;
         info->apertures->ranges[0].size = ggtt->mappable_end;
 
         /* Our framebuffer is the entirety of fbdev's system memory */
         info->fix.smem_start =
             (unsigned long)(ggtt->gmadr.start + vma->node.start);
         info->fix.smem_len = vma->size;
     }
 
     vaddr = i915_vma_pin_iomap(vma);
     if (IS_ERR(vaddr)) {
         drm_err(&dev_priv->drm,
             "Failed to remap framebuffer into virtual memory\n");
         ret = PTR_ERR(vaddr);
         goto out_unpin;
     }
     info->screen_base = vaddr;
     info->screen_size = vma->size;
 
     drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 
     /* If the object is shmemfs backed, it will have given us zeroed pages.
      * If the object is stolen however, it will be full of whatever
      * garbage was left in there.
      */
     if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
         memset_io(info->screen_base, 0, info->screen_size);
 
     /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 
     drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
             ifbdev->fb->base.width, ifbdev->fb->base.height,
             i915_ggtt_offset(vma));
     ifbdev->vma = vma;
     ifbdev->vma_flags = flags;
 
     intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
     vga_switcheroo_client_fb_set(pdev, info);
     return 0;
 
 out_unpin:
     intel_unpin_fb_vma(vma, flags);
 out_unlock:
     intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
     return ret;
 }
 
 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
     .fb_probe = intelfb_create,
 };
 
 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 {
     /* We rely on the object-free to release the VMA pinning for
      * the info->screen_base mmaping. Leaking the VMA is simpler than
      * trying to rectify all the possible error paths leading here.
      */
 
     drm_fb_helper_fini(&ifbdev->helper);
 
     if (ifbdev->vma)
         intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 
     if (ifbdev->fb)
         drm_framebuffer_remove(&ifbdev->fb->base);
 
     kfree(ifbdev);
 }
 
 /*
  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
  * The core display code will have read out the current plane configuration,
  * so we use that to figure out if there's an object for us to use as the
  * fb, and if so, we re-use it for the fbdev configuration.
  *
  * Note we only support a single fb shared across pipes for boot (mostly for
  * fbcon), so we just find the biggest and use that.
  */
 static bool intel_fbdev_init_bios(struct drm_device *dev,
                   struct intel_fbdev *ifbdev)
 {
     struct drm_i915_private *i915 = to_i915(dev);
     struct intel_framebuffer *fb = NULL;
     struct intel_crtc *crtc;
     unsigned int max_size = 0;
 
     /* Find the largest fb */
     for_each_intel_crtc(dev, crtc) {
         struct intel_crtc_state *crtc_state =
             to_intel_crtc_state(crtc->base.state);
         struct intel_plane *plane =
             to_intel_plane(crtc->base.primary);
         struct intel_plane_state *plane_state =
             to_intel_plane_state(plane->base.state);
         struct drm_i915_gem_object *obj =
             intel_fb_obj(plane_state->uapi.fb);
 
         if (!crtc_state->uapi.active) {
             drm_dbg_kms(&i915->drm,
                     "[CRTC:%d:%s] not active, skipping\n",
                     crtc->base.base.id, crtc->base.name);
             continue;
         }
 
         if (!obj) {
             drm_dbg_kms(&i915->drm,
                     "[PLANE:%d:%s] no fb, skipping\n",
                     plane->base.base.id, plane->base.name);
             continue;
         }
 
         if (obj->base.size > max_size) {
             drm_dbg_kms(&i915->drm,
                     "found possible fb from [PLANE:%d:%s]\n",
                     plane->base.base.id, plane->base.name);
             fb = to_intel_framebuffer(plane_state->uapi.fb);
             max_size = obj->base.size;
         }
     }
 
     if (!fb) {
         drm_dbg_kms(&i915->drm,
                 "no active fbs found, not using BIOS config\n");
         goto out;
     }
 
     /* Now make sure all the pipes will fit into it */
     for_each_intel_crtc(dev, crtc) {
         struct intel_crtc_state *crtc_state =
             to_intel_crtc_state(crtc->base.state);
         struct intel_plane *plane =
             to_intel_plane(crtc->base.primary);
         unsigned int cur_size;
 
         if (!crtc_state->uapi.active) {
             drm_dbg_kms(&i915->drm,
                     "[CRTC:%d:%s] not active, skipping\n",
                     crtc->base.base.id, crtc->base.name);
             continue;
         }
 
         drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
                 plane->base.base.id, plane->base.name);
 
         /*
          * See if the plane fb we found above will fit on this
          * pipe.  Note we need to use the selected fb's pitch and bpp
          * rather than the current pipe's, since they differ.
          */
         cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
         cur_size = cur_size * fb->base.format->cpp[0];
         if (fb->base.pitches[0] < cur_size) {
             drm_dbg_kms(&i915->drm,
                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
                     plane->base.base.id, plane->base.name,
                     cur_size, fb->base.pitches[0]);
             fb = NULL;
             break;
         }
 
         cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
         cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
         cur_size *= fb->base.pitches[0];
         drm_dbg_kms(&i915->drm,
                 "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
                 crtc->base.base.id, crtc->base.name,
                 crtc_state->uapi.adjusted_mode.crtc_hdisplay,
                 crtc_state->uapi.adjusted_mode.crtc_vdisplay,
                 fb->base.format->cpp[0] * 8,
                 cur_size);
 
         if (cur_size > max_size) {
             drm_dbg_kms(&i915->drm,
                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
                     plane->base.base.id, plane->base.name,
                     cur_size, max_size);
             fb = NULL;
             break;
         }
 
         drm_dbg_kms(&i915->drm,
                 "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
                 plane->base.base.id, plane->base.name,
                 max_size, cur_size);
     }
 
     if (!fb) {
         drm_dbg_kms(&i915->drm,
                 "BIOS fb not suitable for all pipes, not using\n");
         goto out;
     }
 
     ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
     ifbdev->fb = fb;
 
     drm_framebuffer_get(&ifbdev->fb->base);
 
     /* Final pass to check if any active pipes don't have fbs */
     for_each_intel_crtc(dev, crtc) {
         struct intel_crtc_state *crtc_state =
             to_intel_crtc_state(crtc->base.state);
         struct intel_plane *plane =
             to_intel_plane(crtc->base.primary);
         struct intel_plane_state *plane_state =
             to_intel_plane_state(plane->base.state);
 
         if (!crtc_state->uapi.active)
             continue;
 
         drm_WARN(dev, !plane_state->uapi.fb,
              "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
              plane->base.base.id, plane->base.name);
     }
 
 
     drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
     return true;
 
 out:
 
     return false;
 }
 
 static void intel_fbdev_suspend_worker(struct work_struct *work)
 {
     intel_fbdev_set_suspend(&container_of(work,
                           struct drm_i915_private,
                           fbdev_suspend_work)->drm,
                 FBINFO_STATE_RUNNING,
                 true);
 }
 
 int intel_fbdev_init(struct drm_device *dev)
 {
     struct drm_i915_private *dev_priv = to_i915(dev);
     struct intel_fbdev *ifbdev;
     int ret;
 
     if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
         return -ENODEV;
 
     ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
     if (ifbdev == NULL)
         return -ENOMEM;
 
     mutex_init(&ifbdev->hpd_lock);
     drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 
     if (!intel_fbdev_init_bios(dev, ifbdev))
         ifbdev->preferred_bpp = 32;
 
     ret = drm_fb_helper_init(dev, &ifbdev->helper);
     if (ret) {
         kfree(ifbdev);
         return ret;
     }
 
     dev_priv->fbdev = ifbdev;
     INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 
     return 0;
 }
 
 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 {
     struct intel_fbdev *ifbdev = data;
 
     /* Due to peculiar init order wrt to hpd handling this is separate. */
     if (drm_fb_helper_initial_config(&ifbdev->helper,
                      ifbdev->preferred_bpp))
         intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 }
 
 void intel_fbdev_initial_config_async(struct drm_device *dev)
 {
     struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 
     if (!ifbdev)
         return;
 
     ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 }
 
 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 {
     if (!ifbdev->cookie)
         return;
 
     /* Only serialises with all preceding async calls, hence +1 */
     async_synchronize_cookie(ifbdev->cookie + 1);
     ifbdev->cookie = 0;
 }
 
 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 {
     struct intel_fbdev *ifbdev = dev_priv->fbdev;
 
     if (!ifbdev)
         return;
 
     cancel_work_sync(&dev_priv->fbdev_suspend_work);
     if (!current_is_async())
         intel_fbdev_sync(ifbdev);
 
     drm_fb_helper_unregister_fbi(&ifbdev->helper);
 }
 
 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 {
     struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 
     if (!ifbdev)
         return;
 
     intel_fbdev_destroy(ifbdev);
 }
 
 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
  * processing, fbdev will perform a full connector reprobe if a hotplug event
  * was received while HPD was suspended.
  */
 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 {
     struct intel_fbdev *ifbdev = i915->fbdev;
     bool send_hpd = false;
 
     mutex_lock(&ifbdev->hpd_lock);
     ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
     send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
     ifbdev->hpd_waiting = false;
     mutex_unlock(&ifbdev->hpd_lock);
 
     if (send_hpd) {
         drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
         drm_fb_helper_hotplug_event(&ifbdev->helper);
     }
 }
 
 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 {
     struct drm_i915_private *dev_priv = to_i915(dev);
     struct intel_fbdev *ifbdev = dev_priv->fbdev;
     struct fb_info *info;
 
     if (!ifbdev || !ifbdev->vma)
         return;
 
     info = ifbdev->helper.fbdev;
 
     if (synchronous) {
         /* Flush any pending work to turn the console on, and then
          * wait to turn it off. It must be synchronous as we are
          * about to suspend or unload the driver.
          *
          * Note that from within the work-handler, we cannot flush
          * ourselves, so only flush outstanding work upon suspend!
          */
         if (state != FBINFO_STATE_RUNNING)
             flush_work(&dev_priv->fbdev_suspend_work);
 
         console_lock();
     } else {
         /*
          * The console lock can be pretty contented on resume due
          * to all the printk activity.  Try to keep it out of the hot
          * path of resume if possible.
          */
         drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
         if (!console_trylock()) {
             /* Don't block our own workqueue as this can
              * be run in parallel with other i915.ko tasks.
              */
             schedule_work(&dev_priv->fbdev_suspend_work);
             return;
         }
     }
 
     /* On resume from hibernation: If the object is shmemfs backed, it has
      * been restored from swap. If the object is stolen however, it will be
      * full of whatever garbage was left in there.
      */
     if (state == FBINFO_STATE_RUNNING &&
         !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
         memset_io(info->screen_base, 0, info->screen_size);
 
     drm_fb_helper_set_suspend(&ifbdev->helper, state);
     console_unlock();
 
     intel_fbdev_hpd_set_suspend(dev_priv, state);
 }
 
 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 {
     struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
     bool send_hpd;
 
     if (!ifbdev)
         return;
 
     intel_fbdev_sync(ifbdev);
 
     mutex_lock(&ifbdev->hpd_lock);
     send_hpd = !ifbdev->hpd_suspended;
     ifbdev->hpd_waiting = true;
     mutex_unlock(&ifbdev->hpd_lock);
 
     if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
         drm_fb_helper_hotplug_event(&ifbdev->helper);
 }
 
 void intel_fbdev_restore_mode(struct drm_device *dev)
 {
     struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 
     if (!ifbdev)
         return;
 
     intel_fbdev_sync(ifbdev);
     if (!ifbdev->vma)
         return;
 
     if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
         intel_fbdev_invalidate(ifbdev);
 }
 
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 {
     if (!fbdev || !fbdev->helper.fb)
         return NULL;
 
     return to_intel_framebuffer(fbdev->helper.fb);
 }

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