Super User's BSD Cross Reference: /OpenBSD/sys/dev/pci/drm/i915/display/intel_fbdev.c

 /*
 * 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/console.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fb.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_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_framebuffer_helper.h>

#include "gem/i915_gem_mman.h"
#include "gem/i915_gem_object.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_fbdev_fb.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;
 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 rwlock hpd_lock;
};

 static struct intel_fbdev *to_intel_fbdev(struct drm_fb_helper *fb_helper)
{
 return container_of(fb_helper, struct intel_fbdev, helper);
}

 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);
}

 FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(intel_fbdev,
 drm_fb_helper_damage_range,
 drm_fb_helper_damage_area)

 static int intel_fbdev_set_par(struct fb_info *info)
{
 struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 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 intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 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 intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 int ret;

 ret = drm_fb_helper_pan_display(var, info);
 if (ret == 0)
 intel_fbdev_invalidate(ifbdev);

 return ret;
}

#ifdef notyet
 static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
 struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
 struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
 struct drm_i915_gem_object *obj = to_intel_bo(bo);

 return i915_gem_fb_mmap(obj, vma);
}

 static void intel_fbdev_fb_destroy(struct fb_info *info)
{
 struct drm_fb_helper *fb_helper = info->par;
 struct intel_fbdev *ifbdev = container_of(fb_helper, struct intel_fbdev, helper);

 drm_fb_helper_fini(&ifbdev->helper);

 /*
 * 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.
 */
 intel_fb_unpin_vma(ifbdev->vma, ifbdev->vma_flags);
 drm_framebuffer_remove(&ifbdev->fb->base);

 drm_client_release(&fb_helper->client);
 drm_fb_helper_unprepare(&ifbdev->helper);
 kfree(ifbdev);
}

 __diag_push();
 __diag_ignore_all("-Woverride-init", "Allow field initialization overrides for fb ops");

#endif /* notyet */

 static const struct fb_ops intelfb_ops = {
#ifdef notyet
 .owner = THIS_MODULE,
 __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
 DRM_FB_HELPER_DEFAULT_OPS,
#endif
 .fb_set_par = intel_fbdev_set_par,
#ifdef notyet
 .fb_blank = intel_fbdev_blank,
 .fb_pan_display = intel_fbdev_pan_display,
 __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
 .fb_mmap = intel_fbdev_mmap,
 .fb_destroy = intel_fbdev_fb_destroy,
#endif
};

 __diag_pop();

 static int intelfb_create(struct drm_fb_helper *helper,
 struct drm_fb_helper_surface_size *sizes)
{
 struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 struct intel_framebuffer *fb = ifbdev->fb;
 struct drm_device *dev = helper->dev;
 struct drm_i915_private *dev_priv = to_i915(dev);
 const struct i915_gtt_view view = {
 .type = I915_GTT_VIEW_NORMAL,
 };
 intel_wakeref_t wakeref;
 struct fb_info *info;
 struct i915_vma *vma;
 unsigned long flags = 0;
 bool prealloc = false;
 struct drm_i915_gem_object *obj;
 int ret;

 mutex_lock(&ifbdev->hpd_lock);
 ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
 mutex_unlock(&ifbdev->hpd_lock);
 if (ret)
 return ret;

 ifbdev->fb = NULL;

 if (fb &&
 (sizes->fb_width > fb->base.width ||
 sizes->fb_height > fb->base.height)) {
 drm_dbg_kms(&dev_priv->drm,
 "BIOS fb too small (%dx%d), we require (%dx%d),"
 " releasing it\n",
 fb->base.width, fb->base.height,
 sizes->fb_width, sizes->fb_height);
 drm_framebuffer_put(&fb->base);
 fb = NULL;
 }
 if (!fb || drm_WARN_ON(dev, !intel_fb_obj(&fb->base))) {
 drm_dbg_kms(&dev_priv->drm,
 "no BIOS fb, allocating a new one\n");
 fb = intel_fbdev_fb_alloc(helper, sizes);
 if (IS_ERR(fb))
 return PTR_ERR(fb);
 } else {
 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 prealloc = true;
 sizes->fb_width = fb->base.width;
 sizes->fb_height = 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_fb_pin_to_ggtt(&fb->base, &view,
 fb->min_alignment, 0,
 false, &flags);
 if (IS_ERR(vma)) {
 ret = PTR_ERR(vma);
 goto out_unlock;
 }

 info = drm_fb_helper_alloc_info(helper);
 if (IS_ERR(info)) {
 drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
 ret = PTR_ERR(info);
 goto out_unpin;
 }

 ifbdev->helper.fb = &fb->base;

 info->fbops = &intelfb_ops;

 obj = intel_fb_obj(&fb->base);

 ret = intel_fbdev_fb_fill_info(dev_priv, info, obj, vma);
 if (ret)
 goto out_unpin;

 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(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",
 fb->base.width, fb->base.height,
 i915_ggtt_offset(vma));
 ifbdev->fb = fb;
 ifbdev->vma = vma;
 ifbdev->vma_flags = flags;

 intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
{
 struct drm_framebuffer *fb = ifbdev->helper.fb;
 struct rasops_info *ri = &dev_priv->ro;

 ri->ri_bits = info->screen_base;
 ri->ri_depth = fb->format->cpp[0] * 8;
 ri->ri_stride = fb->pitches[0];
 ri->ri_width = sizes->fb_width;
 ri->ri_height = sizes->fb_height;

 switch (fb->format->format) {
 case DRM_FORMAT_XRGB8888:
 ri->ri_rnum = 8;
 ri->ri_rpos = 16;
 ri->ri_gnum = 8;
 ri->ri_gpos = 8;
 ri->ri_bnum = 8;
 ri->ri_bpos = 0;
 break;
 case DRM_FORMAT_RGB565:
 ri->ri_rnum = 5;
 ri->ri_rpos = 11;
 ri->ri_gnum = 6;
 ri->ri_gpos = 5;
 ri->ri_bnum = 5;
 ri->ri_bpos = 0;
 break;
 }
 intel_fbdev_invalidate(ifbdev);
}
 return 0;

 out_unpin:
 intel_fb_unpin_vma(vma, flags);
 out_unlock:
 intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 return ret;
}

 static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
{
 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
 return 0;

 if (helper->fb->funcs->dirty)
 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);

 return 0;
}

 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 .fb_probe = intelfb_create,
 .fb_dirty = intelfb_dirty,
};

 /*
 * 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 (intel_bo_to_drm_bo(obj)->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 = intel_bo_to_drm_bo(obj)->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,
 display.fbdev.suspend_work)->drm,
 FBINFO_STATE_RUNNING,
 true);
}

 /* 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->display.fbdev.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)
{
#ifdef __linux__
 struct drm_i915_private *dev_priv = to_i915(dev);
 struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 struct fb_info *info;

 if (!ifbdev)
 return;

 if (drm_WARN_ON(&dev_priv->drm, !HAS_DISPLAY(dev_priv)))
 return;

 if (!ifbdev->vma)
 goto set_suspend;

 info = ifbdev->helper.info;

 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->display.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.
 */
 queue_work(dev_priv->unordered_wq,
 &dev_priv->display.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();

 set_suspend:
 intel_fbdev_hpd_set_suspend(dev_priv, state);
#endif
}

 static int intel_fbdev_output_poll_changed(struct drm_device *dev)
{
 struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 bool send_hpd;

 if (!ifbdev)
 return -EINVAL;

 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);

 return 0;
}

 static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
{
 struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 int ret;

 if (!ifbdev)
 return -EINVAL;

 if (!ifbdev->vma)
 return -ENOMEM;

 ret = drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper);
 if (ret)
 return ret;

 intel_fbdev_invalidate(ifbdev);

 return 0;
}

 /*
 * Fbdev client and struct drm_client_funcs
 */

 static void intel_fbdev_client_unregister(struct drm_client_dev *client)
{
 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 struct drm_device *dev = fb_helper->dev;
 struct pci_dev *pdev = dev->pdev;

 if (fb_helper->info) {
 vga_switcheroo_client_fb_set(pdev, NULL);
 drm_fb_helper_unregister_info(fb_helper);
 } else {
 drm_fb_helper_unprepare(fb_helper);
 drm_client_release(&fb_helper->client);
 kfree(fb_helper);
 }
}

 static int intel_fbdev_client_restore(struct drm_client_dev *client)
{
 struct drm_i915_private *dev_priv = to_i915(client->dev);
 int ret;

 ret = intel_fbdev_restore_mode(dev_priv);
 if (ret)
 return ret;

 vga_switcheroo_process_delayed_switch();

 return 0;
}

 static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
{
 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 struct drm_device *dev = client->dev;
 struct pci_dev *pdev = dev->pdev;
 int ret;

 if (dev->fb_helper)
 return intel_fbdev_output_poll_changed(dev);

 ret = drm_fb_helper_init(dev, fb_helper);
 if (ret)
 goto err_drm_err;

 ret = drm_fb_helper_initial_config(fb_helper);
 if (ret)
 goto err_drm_fb_helper_fini;

 vga_switcheroo_client_fb_set(pdev, fb_helper->info);

 return 0;

 err_drm_fb_helper_fini:
 drm_fb_helper_fini(fb_helper);
 err_drm_err:
 drm_err(dev, "Failed to setup i915 fbdev emulation (ret=%d)\n", ret);
 return ret;
}

 static const struct drm_client_funcs intel_fbdev_client_funcs = {
 .owner = THIS_MODULE,
 .unregister = intel_fbdev_client_unregister,
 .restore = intel_fbdev_client_restore,
 .hotplug = intel_fbdev_client_hotplug,
};

 void intel_fbdev_setup(struct drm_i915_private *i915)
{
 struct drm_device *dev = &i915->drm;
 struct intel_fbdev *ifbdev;
 int ret;

 if (!HAS_DISPLAY(i915))
 return;

 ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
 if (!ifbdev)
 return;
 drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);

 i915->display.fbdev.fbdev = ifbdev;
 INIT_WORK(&i915->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 rw_init(&ifbdev->hpd_lock, "hdplk");
 if (intel_fbdev_init_bios(dev, ifbdev))
 ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
 else
 ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;

 ret = drm_client_init(dev, &ifbdev->helper.client, "intel-fbdev",
 &intel_fbdev_client_funcs);
 if (ret) {
 drm_err(dev, "Failed to register client: %d\n", ret);
 goto err_drm_fb_helper_unprepare;
 }

 drm_client_register(&ifbdev->helper.client);

 return;

 err_drm_fb_helper_unprepare:
 drm_fb_helper_unprepare(&ifbdev->helper);
 mutex_destroy(&ifbdev->hpd_lock);
 kfree(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);
}
 

Indexes created Mon Nov 17 03:53:14 PST 2025