2 * Copyright © 2007 David Airlie
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:
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
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.
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/string.h>
32 #include <linux/tty.h>
33 #include <linux/sysrq.h>
34 #include <linux/delay.h>
36 #include <linux/init.h>
37 #include <linux/vga_switcheroo.h>
40 #include <drm/drm_crtc.h>
41 #include <drm/drm_fb_helper.h>
42 #include "intel_drv.h"
43 #include <drm/i915_drm.h>
46 static int intel_fbdev_set_par(struct fb_info
*info
)
48 struct drm_fb_helper
*fb_helper
= info
->par
;
49 struct intel_fbdev
*ifbdev
=
50 container_of(fb_helper
, struct intel_fbdev
, helper
);
53 ret
= drm_fb_helper_set_par(info
);
57 * FIXME: fbdev presumes that all callbacks also work from
58 * atomic contexts and relies on that for emergency oops
59 * printing. KMS totally doesn't do that and the locking here is
60 * by far not the only place this goes wrong. Ignore this for
61 * now until we solve this for real.
63 mutex_lock(&fb_helper
->dev
->struct_mutex
);
64 ret
= i915_gem_object_set_to_gtt_domain(ifbdev
->fb
->obj
,
66 mutex_unlock(&fb_helper
->dev
->struct_mutex
);
72 static struct fb_ops intelfb_ops
= {
74 .fb_check_var
= drm_fb_helper_check_var
,
75 .fb_set_par
= intel_fbdev_set_par
,
76 .fb_fillrect
= cfb_fillrect
,
77 .fb_copyarea
= cfb_copyarea
,
78 .fb_imageblit
= cfb_imageblit
,
79 .fb_pan_display
= drm_fb_helper_pan_display
,
80 .fb_blank
= drm_fb_helper_blank
,
81 .fb_setcmap
= drm_fb_helper_setcmap
,
82 .fb_debug_enter
= drm_fb_helper_debug_enter
,
83 .fb_debug_leave
= drm_fb_helper_debug_leave
,
86 static int intelfb_alloc(struct drm_fb_helper
*helper
,
87 struct drm_fb_helper_surface_size
*sizes
)
89 struct intel_fbdev
*ifbdev
=
90 container_of(helper
, struct intel_fbdev
, helper
);
91 struct drm_framebuffer
*fb
;
92 struct drm_device
*dev
= helper
->dev
;
93 struct drm_mode_fb_cmd2 mode_cmd
= {};
94 struct drm_i915_gem_object
*obj
;
97 /* we don't do packed 24bpp */
98 if (sizes
->surface_bpp
== 24)
99 sizes
->surface_bpp
= 32;
101 mode_cmd
.width
= sizes
->surface_width
;
102 mode_cmd
.height
= sizes
->surface_height
;
104 mode_cmd
.pitches
[0] = ALIGN(mode_cmd
.width
*
105 DIV_ROUND_UP(sizes
->surface_bpp
, 8), 64);
106 mode_cmd
.pixel_format
= drm_mode_legacy_fb_format(sizes
->surface_bpp
,
107 sizes
->surface_depth
);
109 size
= mode_cmd
.pitches
[0] * mode_cmd
.height
;
110 size
= PAGE_ALIGN(size
);
111 obj
= i915_gem_object_create_stolen(dev
, size
);
113 obj
= i915_gem_alloc_object(dev
, size
);
115 DRM_ERROR("failed to allocate framebuffer\n");
120 /* Flush everything out, we'll be doing GTT only from now on */
121 ret
= intel_pin_and_fence_fb_obj(dev
, obj
, NULL
);
123 DRM_ERROR("failed to pin obj: %d\n", ret
);
127 fb
= __intel_framebuffer_create(dev
, &mode_cmd
, obj
);
133 ifbdev
->fb
= to_intel_framebuffer(fb
);
138 i915_gem_object_ggtt_unpin(obj
);
140 drm_gem_object_unreference(&obj
->base
);
145 static int intelfb_create(struct drm_fb_helper
*helper
,
146 struct drm_fb_helper_surface_size
*sizes
)
148 struct intel_fbdev
*ifbdev
=
149 container_of(helper
, struct intel_fbdev
, helper
);
150 struct intel_framebuffer
*intel_fb
= ifbdev
->fb
;
151 struct drm_device
*dev
= helper
->dev
;
152 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
153 struct fb_info
*info
;
154 struct drm_framebuffer
*fb
;
155 struct drm_i915_gem_object
*obj
;
157 bool prealloc
= false;
159 mutex_lock(&dev
->struct_mutex
);
162 (sizes
->fb_width
> intel_fb
->base
.width
||
163 sizes
->fb_height
> intel_fb
->base
.height
)) {
164 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
166 intel_fb
->base
.width
, intel_fb
->base
.height
,
167 sizes
->fb_width
, sizes
->fb_height
);
168 drm_framebuffer_unreference(&intel_fb
->base
);
169 intel_fb
= ifbdev
->fb
= NULL
;
171 if (!intel_fb
|| WARN_ON(!intel_fb
->obj
)) {
172 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
173 ret
= intelfb_alloc(helper
, sizes
);
176 intel_fb
= ifbdev
->fb
;
178 DRM_DEBUG_KMS("re-using BIOS fb\n");
180 sizes
->fb_width
= intel_fb
->base
.width
;
181 sizes
->fb_height
= intel_fb
->base
.height
;
185 size
= obj
->base
.size
;
187 info
= framebuffer_alloc(0, &dev
->pdev
->dev
);
195 fb
= &ifbdev
->fb
->base
;
197 ifbdev
->helper
.fb
= fb
;
198 ifbdev
->helper
.fbdev
= info
;
200 strcpy(info
->fix
.id
, "inteldrmfb");
202 info
->flags
= FBINFO_DEFAULT
| FBINFO_CAN_FORCE_OUTPUT
;
203 info
->fbops
= &intelfb_ops
;
205 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
210 /* setup aperture base/size for vesafb takeover */
211 info
->apertures
= alloc_apertures(1);
212 if (!info
->apertures
) {
216 info
->apertures
->ranges
[0].base
= dev
->mode_config
.fb_base
;
217 info
->apertures
->ranges
[0].size
= dev_priv
->gtt
.mappable_end
;
219 info
->fix
.smem_start
= dev
->mode_config
.fb_base
+ i915_gem_obj_ggtt_offset(obj
);
220 info
->fix
.smem_len
= size
;
223 ioremap_wc(dev_priv
->gtt
.mappable_base
+ i915_gem_obj_ggtt_offset(obj
),
225 if (!info
->screen_base
) {
229 info
->screen_size
= size
;
231 /* This driver doesn't need a VT switch to restore the mode on resume */
232 info
->skip_vt_switch
= true;
234 drm_fb_helper_fill_fix(info
, fb
->pitches
[0], fb
->depth
);
235 drm_fb_helper_fill_var(info
, &ifbdev
->helper
, sizes
->fb_width
, sizes
->fb_height
);
237 /* If the object is shmemfs backed, it will have given us zeroed pages.
238 * If the object is stolen however, it will be full of whatever
239 * garbage was left in there.
241 if (ifbdev
->fb
->obj
->stolen
&& !prealloc
)
242 memset_io(info
->screen_base
, 0, info
->screen_size
);
244 /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
246 DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
247 fb
->width
, fb
->height
,
248 i915_gem_obj_ggtt_offset(obj
), obj
);
250 mutex_unlock(&dev
->struct_mutex
);
251 vga_switcheroo_client_fb_set(dev
->pdev
, info
);
255 i915_gem_object_ggtt_unpin(obj
);
256 drm_gem_object_unreference(&obj
->base
);
258 mutex_unlock(&dev
->struct_mutex
);
262 /** Sets the color ramps on behalf of RandR */
263 static void intel_crtc_fb_gamma_set(struct drm_crtc
*crtc
, u16 red
, u16 green
,
266 struct intel_crtc
*intel_crtc
= to_intel_crtc(crtc
);
268 intel_crtc
->lut_r
[regno
] = red
>> 8;
269 intel_crtc
->lut_g
[regno
] = green
>> 8;
270 intel_crtc
->lut_b
[regno
] = blue
>> 8;
273 static void intel_crtc_fb_gamma_get(struct drm_crtc
*crtc
, u16
*red
, u16
*green
,
274 u16
*blue
, int regno
)
276 struct intel_crtc
*intel_crtc
= to_intel_crtc(crtc
);
278 *red
= intel_crtc
->lut_r
[regno
] << 8;
279 *green
= intel_crtc
->lut_g
[regno
] << 8;
280 *blue
= intel_crtc
->lut_b
[regno
] << 8;
283 static struct drm_fb_helper_crtc
*
284 intel_fb_helper_crtc(struct drm_fb_helper
*fb_helper
, struct drm_crtc
*crtc
)
288 for (i
= 0; i
< fb_helper
->crtc_count
; i
++)
289 if (fb_helper
->crtc_info
[i
].mode_set
.crtc
== crtc
)
290 return &fb_helper
->crtc_info
[i
];
296 * Try to read the BIOS display configuration and use it for the initial
299 * The BIOS or boot loader will generally create an initial display
300 * configuration for us that includes some set of active pipes and displays.
301 * This routine tries to figure out which pipes and connectors are active
302 * and stuffs them into the crtcs and modes array given to us by the
303 * drm_fb_helper code.
305 * The overall sequence is:
306 * intel_fbdev_init - from driver load
307 * intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
308 * drm_fb_helper_init - build fb helper structs
309 * drm_fb_helper_single_add_all_connectors - more fb helper structs
310 * intel_fbdev_initial_config - apply the config
311 * drm_fb_helper_initial_config - call ->probe then register_framebuffer()
312 * drm_setup_crtcs - build crtc config for fbdev
313 * intel_fb_initial_config - find active connectors etc
314 * drm_fb_helper_single_fb_probe - set up fbdev
315 * intelfb_create - re-use or alloc fb, build out fbdev structs
317 * Note that we don't make special consideration whether we could actually
318 * switch to the selected modes without a full modeset. E.g. when the display
319 * is in VGA mode we need to recalculate watermarks and set a new high-res
320 * framebuffer anyway.
322 static bool intel_fb_initial_config(struct drm_fb_helper
*fb_helper
,
323 struct drm_fb_helper_crtc
**crtcs
,
324 struct drm_display_mode
**modes
,
325 bool *enabled
, int width
, int height
)
327 struct drm_device
*dev
= fb_helper
->dev
;
330 bool fallback
= true;
331 int num_connectors_enabled
= 0;
332 int num_connectors_detected
= 0;
335 * If the user specified any force options, just bail here
336 * and use that config.
338 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
339 struct drm_fb_helper_connector
*fb_conn
;
340 struct drm_connector
*connector
;
342 fb_conn
= fb_helper
->connector_info
[i
];
343 connector
= fb_conn
->connector
;
348 if (connector
->force
!= DRM_FORCE_UNSPECIFIED
)
352 save_enabled
= kcalloc(dev
->mode_config
.num_connector
, sizeof(bool),
357 memcpy(save_enabled
, enabled
, dev
->mode_config
.num_connector
);
359 for (i
= 0; i
< fb_helper
->connector_count
; i
++) {
360 struct drm_fb_helper_connector
*fb_conn
;
361 struct drm_connector
*connector
;
362 struct drm_encoder
*encoder
;
363 struct drm_fb_helper_crtc
*new_crtc
;
365 fb_conn
= fb_helper
->connector_info
[i
];
366 connector
= fb_conn
->connector
;
368 if (connector
->status
== connector_status_connected
)
369 num_connectors_detected
++;
372 DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
377 encoder
= connector
->encoder
;
379 struct drm_connector_helper_funcs
*connector_funcs
;
380 connector_funcs
= connector
->helper_private
;
381 encoder
= connector_funcs
->best_encoder(connector
);
383 if (!encoder
|| WARN_ON(!encoder
->crtc
)) {
384 DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
390 num_connectors_enabled
++;
392 new_crtc
= intel_fb_helper_crtc(fb_helper
, encoder
->crtc
);
395 * Make sure we're not trying to drive multiple connectors
396 * with a single CRTC, since our cloning support may not
399 for (j
= 0; j
< fb_helper
->connector_count
; j
++) {
400 if (crtcs
[j
] == new_crtc
) {
401 DRM_DEBUG_KMS("fallback: cloned configuration\n");
407 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
410 /* go for command line mode first */
411 modes
[i
] = drm_pick_cmdline_mode(fb_conn
, width
, height
);
413 /* try for preferred next */
415 DRM_DEBUG_KMS("looking for preferred mode on connector %s\n",
417 modes
[i
] = drm_has_preferred_mode(fb_conn
, width
,
421 /* No preferred mode marked by the EDID? Are there any modes? */
422 if (!modes
[i
] && !list_empty(&connector
->modes
)) {
423 DRM_DEBUG_KMS("using first mode listed on connector %s\n",
425 modes
[i
] = list_first_entry(&connector
->modes
,
426 struct drm_display_mode
,
430 /* last resort: use current mode */
433 * IMPORTANT: We want to use the adjusted mode (i.e.
434 * after the panel fitter upscaling) as the initial
435 * config, not the input mode, which is what crtc->mode
436 * usually contains. But since our current fastboot
437 * code puts a mode derived from the post-pfit timings
438 * into crtc->mode this works out correctly. We don't
439 * use hwmode anywhere right now, so use it for this
440 * since the fb helper layer wants a pointer to
443 DRM_DEBUG_KMS("looking for current mode on connector %s\n",
445 intel_mode_from_pipe_config(&encoder
->crtc
->hwmode
,
446 &to_intel_crtc(encoder
->crtc
)->config
);
447 modes
[i
] = &encoder
->crtc
->hwmode
;
451 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
453 pipe_name(to_intel_crtc(encoder
->crtc
)->pipe
),
454 encoder
->crtc
->base
.id
,
455 modes
[i
]->hdisplay
, modes
[i
]->vdisplay
,
456 modes
[i
]->flags
& DRM_MODE_FLAG_INTERLACE
? "i" :"");
462 * If the BIOS didn't enable everything it could, fall back to have the
463 * same user experiencing of lighting up as much as possible like the
464 * fbdev helper library.
466 if (num_connectors_enabled
!= num_connectors_detected
&&
467 num_connectors_enabled
< INTEL_INFO(dev
)->num_pipes
) {
468 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
469 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled
,
470 num_connectors_detected
);
476 DRM_DEBUG_KMS("Not using firmware configuration\n");
477 memcpy(enabled
, save_enabled
, dev
->mode_config
.num_connector
);
486 static const struct drm_fb_helper_funcs intel_fb_helper_funcs
= {
487 .initial_config
= intel_fb_initial_config
,
488 .gamma_set
= intel_crtc_fb_gamma_set
,
489 .gamma_get
= intel_crtc_fb_gamma_get
,
490 .fb_probe
= intelfb_create
,
493 static void intel_fbdev_destroy(struct drm_device
*dev
,
494 struct intel_fbdev
*ifbdev
)
496 if (ifbdev
->helper
.fbdev
) {
497 struct fb_info
*info
= ifbdev
->helper
.fbdev
;
499 unregister_framebuffer(info
);
500 iounmap(info
->screen_base
);
502 fb_dealloc_cmap(&info
->cmap
);
504 framebuffer_release(info
);
507 drm_fb_helper_fini(&ifbdev
->helper
);
509 drm_framebuffer_unregister_private(&ifbdev
->fb
->base
);
510 drm_framebuffer_remove(&ifbdev
->fb
->base
);
514 * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
515 * The core display code will have read out the current plane configuration,
516 * so we use that to figure out if there's an object for us to use as the
517 * fb, and if so, we re-use it for the fbdev configuration.
519 * Note we only support a single fb shared across pipes for boot (mostly for
520 * fbcon), so we just find the biggest and use that.
522 static bool intel_fbdev_init_bios(struct drm_device
*dev
,
523 struct intel_fbdev
*ifbdev
)
525 struct intel_framebuffer
*fb
= NULL
;
526 struct drm_crtc
*crtc
;
527 struct intel_crtc
*intel_crtc
;
528 struct intel_plane_config
*plane_config
= NULL
;
529 unsigned int max_size
= 0;
534 /* Find the largest fb */
535 for_each_crtc(dev
, crtc
) {
536 intel_crtc
= to_intel_crtc(crtc
);
538 if (!intel_crtc
->active
|| !crtc
->primary
->fb
) {
539 DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
540 pipe_name(intel_crtc
->pipe
));
544 if (intel_crtc
->plane_config
.size
> max_size
) {
545 DRM_DEBUG_KMS("found possible fb from plane %c\n",
546 pipe_name(intel_crtc
->pipe
));
547 plane_config
= &intel_crtc
->plane_config
;
548 fb
= to_intel_framebuffer(crtc
->primary
->fb
);
549 max_size
= plane_config
->size
;
554 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
558 /* Now make sure all the pipes will fit into it */
559 for_each_crtc(dev
, crtc
) {
560 unsigned int cur_size
;
562 intel_crtc
= to_intel_crtc(crtc
);
564 if (!intel_crtc
->active
) {
565 DRM_DEBUG_KMS("pipe %c not active, skipping\n",
566 pipe_name(intel_crtc
->pipe
));
570 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
571 pipe_name(intel_crtc
->pipe
));
574 * See if the plane fb we found above will fit on this
575 * pipe. Note we need to use the selected fb's pitch and bpp
576 * rather than the current pipe's, since they differ.
578 cur_size
= intel_crtc
->config
.adjusted_mode
.crtc_hdisplay
;
579 cur_size
= cur_size
* fb
->base
.bits_per_pixel
/ 8;
580 if (fb
->base
.pitches
[0] < cur_size
) {
581 DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
582 pipe_name(intel_crtc
->pipe
),
583 cur_size
, fb
->base
.pitches
[0]);
589 cur_size
= intel_crtc
->config
.adjusted_mode
.crtc_vdisplay
;
590 cur_size
= ALIGN(cur_size
, plane_config
->tiled
? (IS_GEN2(dev
) ? 16 : 8) : 1);
591 cur_size
*= fb
->base
.pitches
[0];
592 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
593 pipe_name(intel_crtc
->pipe
),
594 intel_crtc
->config
.adjusted_mode
.crtc_hdisplay
,
595 intel_crtc
->config
.adjusted_mode
.crtc_vdisplay
,
596 fb
->base
.bits_per_pixel
,
599 if (cur_size
> max_size
) {
600 DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
601 pipe_name(intel_crtc
->pipe
),
608 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
609 pipe_name(intel_crtc
->pipe
),
614 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
618 ifbdev
->preferred_bpp
= fb
->base
.bits_per_pixel
;
621 drm_framebuffer_reference(&ifbdev
->fb
->base
);
623 /* Final pass to check if any active pipes don't have fbs */
624 for_each_crtc(dev
, crtc
) {
625 intel_crtc
= to_intel_crtc(crtc
);
627 if (!intel_crtc
->active
)
630 WARN(!crtc
->primary
->fb
,
631 "re-used BIOS config but lost an fb on crtc %d\n",
636 DRM_DEBUG_KMS("using BIOS fb for initial console\n");
644 int intel_fbdev_init(struct drm_device
*dev
)
646 struct intel_fbdev
*ifbdev
;
647 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
650 if (WARN_ON(INTEL_INFO(dev
)->num_pipes
== 0))
653 ifbdev
= kzalloc(sizeof(struct intel_fbdev
), GFP_KERNEL
);
657 drm_fb_helper_prepare(dev
, &ifbdev
->helper
, &intel_fb_helper_funcs
);
659 if (!intel_fbdev_init_bios(dev
, ifbdev
))
660 ifbdev
->preferred_bpp
= 32;
662 ret
= drm_fb_helper_init(dev
, &ifbdev
->helper
,
663 INTEL_INFO(dev
)->num_pipes
, 4);
669 dev_priv
->fbdev
= ifbdev
;
670 drm_fb_helper_single_add_all_connectors(&ifbdev
->helper
);
675 void intel_fbdev_initial_config(struct drm_device
*dev
)
677 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
678 struct intel_fbdev
*ifbdev
= dev_priv
->fbdev
;
680 /* Due to peculiar init order wrt to hpd handling this is separate. */
681 drm_fb_helper_initial_config(&ifbdev
->helper
, ifbdev
->preferred_bpp
);
684 void intel_fbdev_fini(struct drm_device
*dev
)
686 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
687 if (!dev_priv
->fbdev
)
690 intel_fbdev_destroy(dev
, dev_priv
->fbdev
);
691 kfree(dev_priv
->fbdev
);
692 dev_priv
->fbdev
= NULL
;
695 void intel_fbdev_set_suspend(struct drm_device
*dev
, int state
)
697 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
698 struct intel_fbdev
*ifbdev
= dev_priv
->fbdev
;
699 struct fb_info
*info
;
704 info
= ifbdev
->helper
.fbdev
;
706 /* On resume from hibernation: If the object is shmemfs backed, it has
707 * been restored from swap. If the object is stolen however, it will be
708 * full of whatever garbage was left in there.
710 if (state
== FBINFO_STATE_RUNNING
&& ifbdev
->fb
->obj
->stolen
)
711 memset_io(info
->screen_base
, 0, info
->screen_size
);
713 fb_set_suspend(info
, state
);
716 void intel_fbdev_output_poll_changed(struct drm_device
*dev
)
718 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
720 drm_fb_helper_hotplug_event(&dev_priv
->fbdev
->helper
);
723 void intel_fbdev_restore_mode(struct drm_device
*dev
)
726 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
728 if (!dev_priv
->fbdev
)
731 ret
= drm_fb_helper_restore_fbdev_mode_unlocked(&dev_priv
->fbdev
->helper
);
733 DRM_DEBUG("failed to restore crtc mode\n");