2 * Copyright © 2014 Intel Corporation
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.
25 * DOC: Frame Buffer Compression (FBC)
27 * FBC tries to save memory bandwidth (and so power consumption) by
28 * compressing the amount of memory used by the display. It is total
29 * transparent to user space and completely handled in the kernel.
31 * The benefits of FBC are mostly visible with solid backgrounds and
32 * variation-less patterns. It comes from keeping the memory footprint small
33 * and having fewer memory pages opened and accessed for refreshing the display.
35 * i915 is responsible to reserve stolen memory for FBC and configure its
36 * offset on proper registers. The hardware takes care of all
37 * compress/decompress. However there are many known cases where we have to
38 * forcibly disable it to allow proper screen updates.
41 #include <drm/drm_fourcc.h>
44 #include "i915_trace.h"
45 #include "i915_vgpu.h"
46 #include "intel_display_types.h"
47 #include "intel_fbc.h"
48 #include "intel_frontbuffer.h"
51 * In some platforms where the CRTC's x:0/y:0 coordinates doesn't match the
52 * frontbuffer's x:0/y:0 coordinates we lie to the hardware about the plane's
53 * origin so the x and y offsets can actually fit the registers. As a
54 * consequence, the fence doesn't really start exactly at the display plane
55 * address we program because it starts at the real start of the buffer, so we
56 * have to take this into consideration here.
58 static unsigned int get_crtc_fence_y_offset(struct intel_fbc
*fbc
)
60 return fbc
->state_cache
.plane
.y
- fbc
->state_cache
.plane
.adjusted_y
;
64 * For SKL+, the plane source size used by the hardware is based on the value we
65 * write to the PLANE_SIZE register. For BDW-, the hardware looks at the value
66 * we wrote to PIPESRC.
68 static void intel_fbc_get_plane_source_size(const struct intel_fbc_state_cache
*cache
,
69 int *width
, int *height
)
72 *width
= cache
->plane
.src_w
;
74 *height
= cache
->plane
.src_h
;
77 static int intel_fbc_calculate_cfb_size(struct drm_i915_private
*dev_priv
,
78 const struct intel_fbc_state_cache
*cache
)
82 intel_fbc_get_plane_source_size(cache
, NULL
, &lines
);
83 if (IS_GEN(dev_priv
, 7))
84 lines
= min(lines
, 2048);
85 else if (INTEL_GEN(dev_priv
) >= 8)
86 lines
= min(lines
, 2560);
88 /* Hardware needs the full buffer stride, not just the active area. */
89 return lines
* cache
->fb
.stride
;
92 static void i8xx_fbc_deactivate(struct drm_i915_private
*dev_priv
)
96 /* Disable compression */
97 fbc_ctl
= intel_de_read(dev_priv
, FBC_CONTROL
);
98 if ((fbc_ctl
& FBC_CTL_EN
) == 0)
101 fbc_ctl
&= ~FBC_CTL_EN
;
102 intel_de_write(dev_priv
, FBC_CONTROL
, fbc_ctl
);
104 /* Wait for compressing bit to clear */
105 if (intel_de_wait_for_clear(dev_priv
, FBC_STATUS
,
106 FBC_STAT_COMPRESSING
, 10)) {
107 DRM_DEBUG_KMS("FBC idle timed out\n");
112 static void i8xx_fbc_activate(struct drm_i915_private
*dev_priv
)
114 struct intel_fbc_reg_params
*params
= &dev_priv
->fbc
.params
;
119 /* Note: fbc.threshold == 1 for i8xx */
120 cfb_pitch
= params
->cfb_size
/ FBC_LL_SIZE
;
121 if (params
->fb
.stride
< cfb_pitch
)
122 cfb_pitch
= params
->fb
.stride
;
124 /* FBC_CTL wants 32B or 64B units */
125 if (IS_GEN(dev_priv
, 2))
126 cfb_pitch
= (cfb_pitch
/ 32) - 1;
128 cfb_pitch
= (cfb_pitch
/ 64) - 1;
131 for (i
= 0; i
< (FBC_LL_SIZE
/ 32) + 1; i
++)
132 intel_de_write(dev_priv
, FBC_TAG(i
), 0);
134 if (IS_GEN(dev_priv
, 4)) {
138 fbc_ctl2
= FBC_CTL_FENCE_DBL
| FBC_CTL_IDLE_IMM
;
139 fbc_ctl2
|= FBC_CTL_PLANE(params
->crtc
.i9xx_plane
);
140 if (params
->fence_id
>= 0)
141 fbc_ctl2
|= FBC_CTL_CPU_FENCE
;
142 intel_de_write(dev_priv
, FBC_CONTROL2
, fbc_ctl2
);
143 intel_de_write(dev_priv
, FBC_FENCE_OFF
,
144 params
->crtc
.fence_y_offset
);
148 fbc_ctl
= intel_de_read(dev_priv
, FBC_CONTROL
);
149 fbc_ctl
&= 0x3fff << FBC_CTL_INTERVAL_SHIFT
;
150 fbc_ctl
|= FBC_CTL_EN
| FBC_CTL_PERIODIC
;
151 if (IS_I945GM(dev_priv
))
152 fbc_ctl
|= FBC_CTL_C3_IDLE
; /* 945 needs special SR handling */
153 fbc_ctl
|= (cfb_pitch
& 0xff) << FBC_CTL_STRIDE_SHIFT
;
154 if (params
->fence_id
>= 0)
155 fbc_ctl
|= params
->fence_id
;
156 intel_de_write(dev_priv
, FBC_CONTROL
, fbc_ctl
);
159 static bool i8xx_fbc_is_active(struct drm_i915_private
*dev_priv
)
161 return intel_de_read(dev_priv
, FBC_CONTROL
) & FBC_CTL_EN
;
164 static void g4x_fbc_activate(struct drm_i915_private
*dev_priv
)
166 struct intel_fbc_reg_params
*params
= &dev_priv
->fbc
.params
;
169 dpfc_ctl
= DPFC_CTL_PLANE(params
->crtc
.i9xx_plane
) | DPFC_SR_EN
;
170 if (params
->fb
.format
->cpp
[0] == 2)
171 dpfc_ctl
|= DPFC_CTL_LIMIT_2X
;
173 dpfc_ctl
|= DPFC_CTL_LIMIT_1X
;
175 if (params
->fence_id
>= 0) {
176 dpfc_ctl
|= DPFC_CTL_FENCE_EN
| params
->fence_id
;
177 intel_de_write(dev_priv
, DPFC_FENCE_YOFF
,
178 params
->crtc
.fence_y_offset
);
180 intel_de_write(dev_priv
, DPFC_FENCE_YOFF
, 0);
184 intel_de_write(dev_priv
, DPFC_CONTROL
, dpfc_ctl
| DPFC_CTL_EN
);
187 static void g4x_fbc_deactivate(struct drm_i915_private
*dev_priv
)
191 /* Disable compression */
192 dpfc_ctl
= intel_de_read(dev_priv
, DPFC_CONTROL
);
193 if (dpfc_ctl
& DPFC_CTL_EN
) {
194 dpfc_ctl
&= ~DPFC_CTL_EN
;
195 intel_de_write(dev_priv
, DPFC_CONTROL
, dpfc_ctl
);
199 static bool g4x_fbc_is_active(struct drm_i915_private
*dev_priv
)
201 return intel_de_read(dev_priv
, DPFC_CONTROL
) & DPFC_CTL_EN
;
204 /* This function forces a CFB recompression through the nuke operation. */
205 static void intel_fbc_recompress(struct drm_i915_private
*dev_priv
)
207 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
209 trace_intel_fbc_nuke(fbc
->crtc
);
211 intel_de_write(dev_priv
, MSG_FBC_REND_STATE
, FBC_REND_NUKE
);
212 intel_de_posting_read(dev_priv
, MSG_FBC_REND_STATE
);
215 static void ilk_fbc_activate(struct drm_i915_private
*dev_priv
)
217 struct intel_fbc_reg_params
*params
= &dev_priv
->fbc
.params
;
219 int threshold
= dev_priv
->fbc
.threshold
;
221 dpfc_ctl
= DPFC_CTL_PLANE(params
->crtc
.i9xx_plane
);
222 if (params
->fb
.format
->cpp
[0] == 2)
228 dpfc_ctl
|= DPFC_CTL_LIMIT_4X
;
231 dpfc_ctl
|= DPFC_CTL_LIMIT_2X
;
234 dpfc_ctl
|= DPFC_CTL_LIMIT_1X
;
238 if (params
->fence_id
>= 0) {
239 dpfc_ctl
|= DPFC_CTL_FENCE_EN
;
240 if (IS_GEN(dev_priv
, 5))
241 dpfc_ctl
|= params
->fence_id
;
242 if (IS_GEN(dev_priv
, 6)) {
243 intel_de_write(dev_priv
, SNB_DPFC_CTL_SA
,
244 SNB_CPU_FENCE_ENABLE
| params
->fence_id
);
245 intel_de_write(dev_priv
, DPFC_CPU_FENCE_OFFSET
,
246 params
->crtc
.fence_y_offset
);
249 if (IS_GEN(dev_priv
, 6)) {
250 intel_de_write(dev_priv
, SNB_DPFC_CTL_SA
, 0);
251 intel_de_write(dev_priv
, DPFC_CPU_FENCE_OFFSET
, 0);
255 intel_de_write(dev_priv
, ILK_DPFC_FENCE_YOFF
,
256 params
->crtc
.fence_y_offset
);
258 intel_de_write(dev_priv
, ILK_DPFC_CONTROL
, dpfc_ctl
| DPFC_CTL_EN
);
260 intel_fbc_recompress(dev_priv
);
263 static void ilk_fbc_deactivate(struct drm_i915_private
*dev_priv
)
267 /* Disable compression */
268 dpfc_ctl
= intel_de_read(dev_priv
, ILK_DPFC_CONTROL
);
269 if (dpfc_ctl
& DPFC_CTL_EN
) {
270 dpfc_ctl
&= ~DPFC_CTL_EN
;
271 intel_de_write(dev_priv
, ILK_DPFC_CONTROL
, dpfc_ctl
);
275 static bool ilk_fbc_is_active(struct drm_i915_private
*dev_priv
)
277 return intel_de_read(dev_priv
, ILK_DPFC_CONTROL
) & DPFC_CTL_EN
;
280 static void gen7_fbc_activate(struct drm_i915_private
*dev_priv
)
282 struct intel_fbc_reg_params
*params
= &dev_priv
->fbc
.params
;
284 int threshold
= dev_priv
->fbc
.threshold
;
286 /* Display WA #0529: skl, kbl, bxt. */
287 if (IS_GEN9_BC(dev_priv
) || IS_BROXTON(dev_priv
)) {
288 u32 val
= intel_de_read(dev_priv
, CHICKEN_MISC_4
);
290 val
&= ~(FBC_STRIDE_OVERRIDE
| FBC_STRIDE_MASK
);
292 if (params
->gen9_wa_cfb_stride
)
293 val
|= FBC_STRIDE_OVERRIDE
| params
->gen9_wa_cfb_stride
;
295 intel_de_write(dev_priv
, CHICKEN_MISC_4
, val
);
299 if (IS_IVYBRIDGE(dev_priv
))
300 dpfc_ctl
|= IVB_DPFC_CTL_PLANE(params
->crtc
.i9xx_plane
);
302 if (params
->fb
.format
->cpp
[0] == 2)
308 dpfc_ctl
|= DPFC_CTL_LIMIT_4X
;
311 dpfc_ctl
|= DPFC_CTL_LIMIT_2X
;
314 dpfc_ctl
|= DPFC_CTL_LIMIT_1X
;
318 if (params
->fence_id
>= 0) {
319 dpfc_ctl
|= IVB_DPFC_CTL_FENCE_EN
;
320 intel_de_write(dev_priv
, SNB_DPFC_CTL_SA
,
321 SNB_CPU_FENCE_ENABLE
| params
->fence_id
);
322 intel_de_write(dev_priv
, DPFC_CPU_FENCE_OFFSET
,
323 params
->crtc
.fence_y_offset
);
324 } else if (dev_priv
->ggtt
.num_fences
) {
325 intel_de_write(dev_priv
, SNB_DPFC_CTL_SA
, 0);
326 intel_de_write(dev_priv
, DPFC_CPU_FENCE_OFFSET
, 0);
329 if (dev_priv
->fbc
.false_color
)
330 dpfc_ctl
|= FBC_CTL_FALSE_COLOR
;
332 if (IS_IVYBRIDGE(dev_priv
)) {
333 /* WaFbcAsynchFlipDisableFbcQueue:ivb */
334 intel_de_write(dev_priv
, ILK_DISPLAY_CHICKEN1
,
335 intel_de_read(dev_priv
, ILK_DISPLAY_CHICKEN1
) | ILK_FBCQ_DIS
);
336 } else if (IS_HASWELL(dev_priv
) || IS_BROADWELL(dev_priv
)) {
337 /* WaFbcAsynchFlipDisableFbcQueue:hsw,bdw */
338 intel_de_write(dev_priv
, CHICKEN_PIPESL_1(params
->crtc
.pipe
),
339 intel_de_read(dev_priv
, CHICKEN_PIPESL_1(params
->crtc
.pipe
)) | HSW_FBCQ_DIS
);
342 if (INTEL_GEN(dev_priv
) >= 11)
343 /* Wa_1409120013:icl,ehl,tgl */
344 intel_de_write(dev_priv
, ILK_DPFC_CHICKEN
,
345 ILK_DPFC_CHICKEN_COMP_DUMMY_PIXEL
);
347 intel_de_write(dev_priv
, ILK_DPFC_CONTROL
, dpfc_ctl
| DPFC_CTL_EN
);
349 intel_fbc_recompress(dev_priv
);
352 static bool intel_fbc_hw_is_active(struct drm_i915_private
*dev_priv
)
354 if (INTEL_GEN(dev_priv
) >= 5)
355 return ilk_fbc_is_active(dev_priv
);
356 else if (IS_GM45(dev_priv
))
357 return g4x_fbc_is_active(dev_priv
);
359 return i8xx_fbc_is_active(dev_priv
);
362 static void intel_fbc_hw_activate(struct drm_i915_private
*dev_priv
)
364 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
366 trace_intel_fbc_activate(fbc
->crtc
);
369 fbc
->activated
= true;
371 if (INTEL_GEN(dev_priv
) >= 7)
372 gen7_fbc_activate(dev_priv
);
373 else if (INTEL_GEN(dev_priv
) >= 5)
374 ilk_fbc_activate(dev_priv
);
375 else if (IS_GM45(dev_priv
))
376 g4x_fbc_activate(dev_priv
);
378 i8xx_fbc_activate(dev_priv
);
381 static void intel_fbc_hw_deactivate(struct drm_i915_private
*dev_priv
)
383 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
385 trace_intel_fbc_deactivate(fbc
->crtc
);
389 if (INTEL_GEN(dev_priv
) >= 5)
390 ilk_fbc_deactivate(dev_priv
);
391 else if (IS_GM45(dev_priv
))
392 g4x_fbc_deactivate(dev_priv
);
394 i8xx_fbc_deactivate(dev_priv
);
398 * intel_fbc_is_active - Is FBC active?
399 * @dev_priv: i915 device instance
401 * This function is used to verify the current state of FBC.
403 * FIXME: This should be tracked in the plane config eventually
404 * instead of queried at runtime for most callers.
406 bool intel_fbc_is_active(struct drm_i915_private
*dev_priv
)
408 return dev_priv
->fbc
.active
;
411 static void intel_fbc_deactivate(struct drm_i915_private
*dev_priv
,
414 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
416 drm_WARN_ON(&dev_priv
->drm
, !mutex_is_locked(&fbc
->lock
));
419 intel_fbc_hw_deactivate(dev_priv
);
421 fbc
->no_fbc_reason
= reason
;
424 static int find_compression_threshold(struct drm_i915_private
*dev_priv
,
425 struct drm_mm_node
*node
,
429 int compression_threshold
= 1;
433 /* The FBC hardware for BDW/SKL doesn't have access to the stolen
434 * reserved range size, so it always assumes the maximum (8mb) is used.
435 * If we enable FBC using a CFB on that memory range we'll get FIFO
436 * underruns, even if that range is not reserved by the BIOS. */
437 if (IS_BROADWELL(dev_priv
) || IS_GEN9_BC(dev_priv
))
438 end
= resource_size(&dev_priv
->dsm
) - 8 * 1024 * 1024;
442 /* HACK: This code depends on what we will do in *_enable_fbc. If that
443 * code changes, this code needs to change as well.
445 * The enable_fbc code will attempt to use one of our 2 compression
446 * thresholds, therefore, in that case, we only have 1 resort.
449 /* Try to over-allocate to reduce reallocations and fragmentation. */
450 ret
= i915_gem_stolen_insert_node_in_range(dev_priv
, node
, size
<<= 1,
453 return compression_threshold
;
456 /* HW's ability to limit the CFB is 1:4 */
457 if (compression_threshold
> 4 ||
458 (fb_cpp
== 2 && compression_threshold
== 2))
461 ret
= i915_gem_stolen_insert_node_in_range(dev_priv
, node
, size
>>= 1,
463 if (ret
&& INTEL_GEN(dev_priv
) <= 4) {
466 compression_threshold
<<= 1;
469 return compression_threshold
;
473 static int intel_fbc_alloc_cfb(struct drm_i915_private
*dev_priv
,
474 unsigned int size
, unsigned int fb_cpp
)
476 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
477 struct drm_mm_node
*uninitialized_var(compressed_llb
);
480 drm_WARN_ON(&dev_priv
->drm
,
481 drm_mm_node_allocated(&fbc
->compressed_fb
));
483 ret
= find_compression_threshold(dev_priv
, &fbc
->compressed_fb
,
488 DRM_INFO_ONCE("Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.\n");
491 fbc
->threshold
= ret
;
493 if (INTEL_GEN(dev_priv
) >= 5)
494 intel_de_write(dev_priv
, ILK_DPFC_CB_BASE
,
495 fbc
->compressed_fb
.start
);
496 else if (IS_GM45(dev_priv
)) {
497 intel_de_write(dev_priv
, DPFC_CB_BASE
,
498 fbc
->compressed_fb
.start
);
500 compressed_llb
= kzalloc(sizeof(*compressed_llb
), GFP_KERNEL
);
504 ret
= i915_gem_stolen_insert_node(dev_priv
, compressed_llb
,
509 fbc
->compressed_llb
= compressed_llb
;
511 GEM_BUG_ON(range_overflows_end_t(u64
, dev_priv
->dsm
.start
,
512 fbc
->compressed_fb
.start
,
514 GEM_BUG_ON(range_overflows_end_t(u64
, dev_priv
->dsm
.start
,
515 fbc
->compressed_llb
->start
,
517 intel_de_write(dev_priv
, FBC_CFB_BASE
,
518 dev_priv
->dsm
.start
+ fbc
->compressed_fb
.start
);
519 intel_de_write(dev_priv
, FBC_LL_BASE
,
520 dev_priv
->dsm
.start
+ compressed_llb
->start
);
523 DRM_DEBUG_KMS("reserved %llu bytes of contiguous stolen space for FBC, threshold: %d\n",
524 fbc
->compressed_fb
.size
, fbc
->threshold
);
529 kfree(compressed_llb
);
530 i915_gem_stolen_remove_node(dev_priv
, &fbc
->compressed_fb
);
532 if (drm_mm_initialized(&dev_priv
->mm
.stolen
))
533 pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size
);
537 static void __intel_fbc_cleanup_cfb(struct drm_i915_private
*dev_priv
)
539 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
541 if (!drm_mm_node_allocated(&fbc
->compressed_fb
))
544 if (fbc
->compressed_llb
) {
545 i915_gem_stolen_remove_node(dev_priv
, fbc
->compressed_llb
);
546 kfree(fbc
->compressed_llb
);
549 i915_gem_stolen_remove_node(dev_priv
, &fbc
->compressed_fb
);
552 void intel_fbc_cleanup_cfb(struct drm_i915_private
*dev_priv
)
554 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
556 if (!HAS_FBC(dev_priv
))
559 mutex_lock(&fbc
->lock
);
560 __intel_fbc_cleanup_cfb(dev_priv
);
561 mutex_unlock(&fbc
->lock
);
564 static bool stride_is_valid(struct drm_i915_private
*dev_priv
,
567 /* This should have been caught earlier. */
568 if (drm_WARN_ON_ONCE(&dev_priv
->drm
, (stride
& (64 - 1)) != 0))
571 /* Below are the additional FBC restrictions. */
575 if (IS_GEN(dev_priv
, 2) || IS_GEN(dev_priv
, 3))
576 return stride
== 4096 || stride
== 8192;
578 if (IS_GEN(dev_priv
, 4) && !IS_G4X(dev_priv
) && stride
< 2048)
587 static bool pixel_format_is_valid(struct drm_i915_private
*dev_priv
,
590 switch (pixel_format
) {
591 case DRM_FORMAT_XRGB8888
:
592 case DRM_FORMAT_XBGR8888
:
594 case DRM_FORMAT_XRGB1555
:
595 case DRM_FORMAT_RGB565
:
596 /* 16bpp not supported on gen2 */
597 if (IS_GEN(dev_priv
, 2))
599 /* WaFbcOnly1to1Ratio:ctg */
600 if (IS_G4X(dev_priv
))
609 * For some reason, the hardware tracking starts looking at whatever we
610 * programmed as the display plane base address register. It does not look at
611 * the X and Y offset registers. That's why we look at the crtc->adjusted{x,y}
612 * variables instead of just looking at the pipe/plane size.
614 static bool intel_fbc_hw_tracking_covers_screen(struct intel_crtc
*crtc
)
616 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
617 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
618 unsigned int effective_w
, effective_h
, max_w
, max_h
;
620 if (INTEL_GEN(dev_priv
) >= 10 || IS_GEMINILAKE(dev_priv
)) {
623 } else if (INTEL_GEN(dev_priv
) >= 8 || IS_HASWELL(dev_priv
)) {
626 } else if (IS_G4X(dev_priv
) || INTEL_GEN(dev_priv
) >= 5) {
634 intel_fbc_get_plane_source_size(&fbc
->state_cache
, &effective_w
,
636 effective_w
+= fbc
->state_cache
.plane
.adjusted_x
;
637 effective_h
+= fbc
->state_cache
.plane
.adjusted_y
;
639 return effective_w
<= max_w
&& effective_h
<= max_h
;
642 static void intel_fbc_update_state_cache(struct intel_crtc
*crtc
,
643 const struct intel_crtc_state
*crtc_state
,
644 const struct intel_plane_state
*plane_state
)
646 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
647 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
648 struct intel_fbc_state_cache
*cache
= &fbc
->state_cache
;
649 struct drm_framebuffer
*fb
= plane_state
->hw
.fb
;
651 cache
->plane
.visible
= plane_state
->uapi
.visible
;
652 if (!cache
->plane
.visible
)
655 cache
->crtc
.mode_flags
= crtc_state
->hw
.adjusted_mode
.flags
;
656 if (IS_HASWELL(dev_priv
) || IS_BROADWELL(dev_priv
))
657 cache
->crtc
.hsw_bdw_pixel_rate
= crtc_state
->pixel_rate
;
659 cache
->plane
.rotation
= plane_state
->hw
.rotation
;
661 * Src coordinates are already rotated by 270 degrees for
662 * the 90/270 degree plane rotation cases (to match the
663 * GTT mapping), hence no need to account for rotation here.
665 cache
->plane
.src_w
= drm_rect_width(&plane_state
->uapi
.src
) >> 16;
666 cache
->plane
.src_h
= drm_rect_height(&plane_state
->uapi
.src
) >> 16;
667 cache
->plane
.adjusted_x
= plane_state
->color_plane
[0].x
;
668 cache
->plane
.adjusted_y
= plane_state
->color_plane
[0].y
;
669 cache
->plane
.y
= plane_state
->uapi
.src
.y1
>> 16;
671 cache
->plane
.pixel_blend_mode
= plane_state
->hw
.pixel_blend_mode
;
673 cache
->fb
.format
= fb
->format
;
674 cache
->fb
.stride
= fb
->pitches
[0];
676 drm_WARN_ON(&dev_priv
->drm
, plane_state
->flags
& PLANE_HAS_FENCE
&&
677 !plane_state
->vma
->fence
);
679 if (plane_state
->flags
& PLANE_HAS_FENCE
&&
680 plane_state
->vma
->fence
)
681 cache
->fence_id
= plane_state
->vma
->fence
->id
;
683 cache
->fence_id
= -1;
686 static bool intel_fbc_cfb_size_changed(struct drm_i915_private
*dev_priv
)
688 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
690 return intel_fbc_calculate_cfb_size(dev_priv
, &fbc
->state_cache
) >
691 fbc
->compressed_fb
.size
* fbc
->threshold
;
694 static bool intel_fbc_can_enable(struct drm_i915_private
*dev_priv
)
696 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
698 if (intel_vgpu_active(dev_priv
)) {
699 fbc
->no_fbc_reason
= "VGPU is active";
703 if (!i915_modparams
.enable_fbc
) {
704 fbc
->no_fbc_reason
= "disabled per module param or by default";
708 if (fbc
->underrun_detected
) {
709 fbc
->no_fbc_reason
= "underrun detected";
716 static bool intel_fbc_can_activate(struct intel_crtc
*crtc
)
718 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
719 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
720 struct intel_fbc_state_cache
*cache
= &fbc
->state_cache
;
722 if (!intel_fbc_can_enable(dev_priv
))
725 if (!cache
->plane
.visible
) {
726 fbc
->no_fbc_reason
= "primary plane not visible";
730 /* We don't need to use a state cache here since this information is
731 * global for all CRTC.
733 if (fbc
->underrun_detected
) {
734 fbc
->no_fbc_reason
= "underrun detected";
738 if (cache
->crtc
.mode_flags
& DRM_MODE_FLAG_INTERLACE
) {
739 fbc
->no_fbc_reason
= "incompatible mode";
743 if (!intel_fbc_hw_tracking_covers_screen(crtc
)) {
744 fbc
->no_fbc_reason
= "mode too large for compression";
748 /* The use of a CPU fence is mandatory in order to detect writes
749 * by the CPU to the scanout and trigger updates to the FBC.
751 * Note that is possible for a tiled surface to be unmappable (and
752 * so have no fence associated with it) due to aperture constaints
753 * at the time of pinning.
755 * FIXME with 90/270 degree rotation we should use the fence on
756 * the normal GTT view (the rotated view doesn't even have a
757 * fence). Would need changes to the FBC fence Y offset as well.
758 * For now this will effecively disable FBC with 90/270 degree
761 if (cache
->fence_id
< 0) {
762 fbc
->no_fbc_reason
= "framebuffer not tiled or fenced";
765 if (INTEL_GEN(dev_priv
) <= 4 && !IS_G4X(dev_priv
) &&
766 cache
->plane
.rotation
!= DRM_MODE_ROTATE_0
) {
767 fbc
->no_fbc_reason
= "rotation unsupported";
771 if (!stride_is_valid(dev_priv
, cache
->fb
.stride
)) {
772 fbc
->no_fbc_reason
= "framebuffer stride not supported";
776 if (!pixel_format_is_valid(dev_priv
, cache
->fb
.format
->format
)) {
777 fbc
->no_fbc_reason
= "pixel format is invalid";
781 if (cache
->plane
.pixel_blend_mode
!= DRM_MODE_BLEND_PIXEL_NONE
&&
782 cache
->fb
.format
->has_alpha
) {
783 fbc
->no_fbc_reason
= "per-pixel alpha blending is incompatible with FBC";
787 /* WaFbcExceedCdClockThreshold:hsw,bdw */
788 if ((IS_HASWELL(dev_priv
) || IS_BROADWELL(dev_priv
)) &&
789 cache
->crtc
.hsw_bdw_pixel_rate
>= dev_priv
->cdclk
.hw
.cdclk
* 95 / 100) {
790 fbc
->no_fbc_reason
= "pixel rate is too big";
794 /* It is possible for the required CFB size change without a
795 * crtc->disable + crtc->enable since it is possible to change the
796 * stride without triggering a full modeset. Since we try to
797 * over-allocate the CFB, there's a chance we may keep FBC enabled even
798 * if this happens, but if we exceed the current CFB size we'll have to
799 * disable FBC. Notice that it would be possible to disable FBC, wait
800 * for a frame, free the stolen node, then try to reenable FBC in case
801 * we didn't get any invalidate/deactivate calls, but this would require
802 * a lot of tracking just for a specific case. If we conclude it's an
803 * important case, we can implement it later. */
804 if (intel_fbc_cfb_size_changed(dev_priv
)) {
805 fbc
->no_fbc_reason
= "CFB requirements changed";
810 * Work around a problem on GEN9+ HW, where enabling FBC on a plane
811 * having a Y offset that isn't divisible by 4 causes FIFO underrun
812 * and screen flicker.
814 if (INTEL_GEN(dev_priv
) >= 9 &&
815 (fbc
->state_cache
.plane
.adjusted_y
& 3)) {
816 fbc
->no_fbc_reason
= "plane Y offset is misaligned";
823 static void intel_fbc_get_reg_params(struct intel_crtc
*crtc
,
824 struct intel_fbc_reg_params
*params
)
826 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
827 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
828 struct intel_fbc_state_cache
*cache
= &fbc
->state_cache
;
830 /* Since all our fields are integer types, use memset here so the
831 * comparison function can rely on memcmp because the padding will be
833 memset(params
, 0, sizeof(*params
));
835 params
->fence_id
= cache
->fence_id
;
837 params
->crtc
.pipe
= crtc
->pipe
;
838 params
->crtc
.i9xx_plane
= to_intel_plane(crtc
->base
.primary
)->i9xx_plane
;
839 params
->crtc
.fence_y_offset
= get_crtc_fence_y_offset(fbc
);
841 params
->fb
.format
= cache
->fb
.format
;
842 params
->fb
.stride
= cache
->fb
.stride
;
844 params
->cfb_size
= intel_fbc_calculate_cfb_size(dev_priv
, cache
);
846 params
->gen9_wa_cfb_stride
= cache
->gen9_wa_cfb_stride
;
848 params
->plane_visible
= cache
->plane
.visible
;
851 static bool intel_fbc_can_flip_nuke(const struct intel_crtc_state
*crtc_state
)
853 struct intel_crtc
*crtc
= to_intel_crtc(crtc_state
->uapi
.crtc
);
854 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
855 const struct intel_fbc
*fbc
= &dev_priv
->fbc
;
856 const struct intel_fbc_state_cache
*cache
= &fbc
->state_cache
;
857 const struct intel_fbc_reg_params
*params
= &fbc
->params
;
859 if (drm_atomic_crtc_needs_modeset(&crtc_state
->uapi
))
862 if (!params
->plane_visible
)
865 if (!intel_fbc_can_activate(crtc
))
868 if (params
->fb
.format
!= cache
->fb
.format
)
871 if (params
->fb
.stride
!= cache
->fb
.stride
)
874 if (params
->cfb_size
!= intel_fbc_calculate_cfb_size(dev_priv
, cache
))
877 if (params
->gen9_wa_cfb_stride
!= cache
->gen9_wa_cfb_stride
)
883 bool intel_fbc_pre_update(struct intel_atomic_state
*state
,
884 struct intel_crtc
*crtc
)
886 struct intel_plane
*plane
= to_intel_plane(crtc
->base
.primary
);
887 const struct intel_crtc_state
*crtc_state
=
888 intel_atomic_get_new_crtc_state(state
, crtc
);
889 const struct intel_plane_state
*plane_state
=
890 intel_atomic_get_new_plane_state(state
, plane
);
891 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
892 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
893 const char *reason
= "update pending";
894 bool need_vblank_wait
= false;
896 if (!plane
->has_fbc
|| !plane_state
)
897 return need_vblank_wait
;
899 mutex_lock(&fbc
->lock
);
901 if (fbc
->crtc
!= crtc
)
904 intel_fbc_update_state_cache(crtc
, crtc_state
, plane_state
);
905 fbc
->flip_pending
= true;
907 if (!intel_fbc_can_flip_nuke(crtc_state
)) {
908 intel_fbc_deactivate(dev_priv
, reason
);
911 * Display WA #1198: glk+
912 * Need an extra vblank wait between FBC disable and most plane
913 * updates. Bspec says this is only needed for plane disable, but
914 * that is not true. Touching most plane registers will cause the
915 * corruption to appear. Also SKL/derivatives do not seem to be
918 * TODO: could optimize this a bit by sampling the frame
919 * counter when we disable FBC (if it was already done earlier)
920 * and skipping the extra vblank wait before the plane update
921 * if at least one frame has already passed.
923 if (fbc
->activated
&&
924 (INTEL_GEN(dev_priv
) >= 10 || IS_GEMINILAKE(dev_priv
)))
925 need_vblank_wait
= true;
926 fbc
->activated
= false;
929 mutex_unlock(&fbc
->lock
);
931 return need_vblank_wait
;
935 * __intel_fbc_disable - disable FBC
936 * @dev_priv: i915 device instance
938 * This is the low level function that actually disables FBC. Callers should
941 static void __intel_fbc_disable(struct drm_i915_private
*dev_priv
)
943 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
944 struct intel_crtc
*crtc
= fbc
->crtc
;
946 drm_WARN_ON(&dev_priv
->drm
, !mutex_is_locked(&fbc
->lock
));
947 drm_WARN_ON(&dev_priv
->drm
, !fbc
->crtc
);
948 drm_WARN_ON(&dev_priv
->drm
, fbc
->active
);
950 DRM_DEBUG_KMS("Disabling FBC on pipe %c\n", pipe_name(crtc
->pipe
));
952 __intel_fbc_cleanup_cfb(dev_priv
);
957 static void __intel_fbc_post_update(struct intel_crtc
*crtc
)
959 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
960 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
962 drm_WARN_ON(&dev_priv
->drm
, !mutex_is_locked(&fbc
->lock
));
964 if (fbc
->crtc
!= crtc
)
967 fbc
->flip_pending
= false;
969 if (!i915_modparams
.enable_fbc
) {
970 intel_fbc_deactivate(dev_priv
, "disabled at runtime per module param");
971 __intel_fbc_disable(dev_priv
);
976 intel_fbc_get_reg_params(crtc
, &fbc
->params
);
978 if (!intel_fbc_can_activate(crtc
))
982 intel_fbc_hw_activate(dev_priv
);
984 intel_fbc_deactivate(dev_priv
, "frontbuffer write");
987 void intel_fbc_post_update(struct intel_atomic_state
*state
,
988 struct intel_crtc
*crtc
)
990 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
991 struct intel_plane
*plane
= to_intel_plane(crtc
->base
.primary
);
992 const struct intel_plane_state
*plane_state
=
993 intel_atomic_get_new_plane_state(state
, plane
);
994 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
996 if (!plane
->has_fbc
|| !plane_state
)
999 mutex_lock(&fbc
->lock
);
1000 __intel_fbc_post_update(crtc
);
1001 mutex_unlock(&fbc
->lock
);
1004 static unsigned int intel_fbc_get_frontbuffer_bit(struct intel_fbc
*fbc
)
1007 return to_intel_plane(fbc
->crtc
->base
.primary
)->frontbuffer_bit
;
1009 return fbc
->possible_framebuffer_bits
;
1012 void intel_fbc_invalidate(struct drm_i915_private
*dev_priv
,
1013 unsigned int frontbuffer_bits
,
1014 enum fb_op_origin origin
)
1016 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1018 if (!HAS_FBC(dev_priv
))
1021 if (origin
== ORIGIN_GTT
|| origin
== ORIGIN_FLIP
)
1024 mutex_lock(&fbc
->lock
);
1026 fbc
->busy_bits
|= intel_fbc_get_frontbuffer_bit(fbc
) & frontbuffer_bits
;
1028 if (fbc
->crtc
&& fbc
->busy_bits
)
1029 intel_fbc_deactivate(dev_priv
, "frontbuffer write");
1031 mutex_unlock(&fbc
->lock
);
1034 void intel_fbc_flush(struct drm_i915_private
*dev_priv
,
1035 unsigned int frontbuffer_bits
, enum fb_op_origin origin
)
1037 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1039 if (!HAS_FBC(dev_priv
))
1042 mutex_lock(&fbc
->lock
);
1044 fbc
->busy_bits
&= ~frontbuffer_bits
;
1046 if (origin
== ORIGIN_GTT
|| origin
== ORIGIN_FLIP
)
1049 if (!fbc
->busy_bits
&& fbc
->crtc
&&
1050 (frontbuffer_bits
& intel_fbc_get_frontbuffer_bit(fbc
))) {
1052 intel_fbc_recompress(dev_priv
);
1053 else if (!fbc
->flip_pending
)
1054 __intel_fbc_post_update(fbc
->crtc
);
1058 mutex_unlock(&fbc
->lock
);
1062 * intel_fbc_choose_crtc - select a CRTC to enable FBC on
1063 * @dev_priv: i915 device instance
1064 * @state: the atomic state structure
1066 * This function looks at the proposed state for CRTCs and planes, then chooses
1067 * which pipe is going to have FBC by setting intel_crtc_state->enable_fbc to
1070 * Later, intel_fbc_enable is going to look for state->enable_fbc and then maybe
1071 * enable FBC for the chosen CRTC. If it does, it will set dev_priv->fbc.crtc.
1073 void intel_fbc_choose_crtc(struct drm_i915_private
*dev_priv
,
1074 struct intel_atomic_state
*state
)
1076 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1077 struct intel_plane
*plane
;
1078 struct intel_plane_state
*plane_state
;
1079 bool crtc_chosen
= false;
1082 mutex_lock(&fbc
->lock
);
1084 /* Does this atomic commit involve the CRTC currently tied to FBC? */
1086 !intel_atomic_get_new_crtc_state(state
, fbc
->crtc
))
1089 if (!intel_fbc_can_enable(dev_priv
))
1092 /* Simply choose the first CRTC that is compatible and has a visible
1093 * plane. We could go for fancier schemes such as checking the plane
1094 * size, but this would just affect the few platforms that don't tie FBC
1095 * to pipe or plane A. */
1096 for_each_new_intel_plane_in_state(state
, plane
, plane_state
, i
) {
1097 struct intel_crtc_state
*crtc_state
;
1098 struct intel_crtc
*crtc
= to_intel_crtc(plane_state
->hw
.crtc
);
1100 if (!plane
->has_fbc
)
1103 if (!plane_state
->uapi
.visible
)
1106 crtc_state
= intel_atomic_get_new_crtc_state(state
, crtc
);
1108 crtc_state
->enable_fbc
= true;
1114 fbc
->no_fbc_reason
= "no suitable CRTC for FBC";
1117 mutex_unlock(&fbc
->lock
);
1121 * intel_fbc_enable: tries to enable FBC on the CRTC
1123 * @state: corresponding &drm_crtc_state for @crtc
1125 * This function checks if the given CRTC was chosen for FBC, then enables it if
1126 * possible. Notice that it doesn't activate FBC. It is valid to call
1127 * intel_fbc_enable multiple times for the same pipe without an
1128 * intel_fbc_disable in the middle, as long as it is deactivated.
1130 void intel_fbc_enable(struct intel_atomic_state
*state
,
1131 struct intel_crtc
*crtc
)
1133 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
1134 struct intel_plane
*plane
= to_intel_plane(crtc
->base
.primary
);
1135 const struct intel_crtc_state
*crtc_state
=
1136 intel_atomic_get_new_crtc_state(state
, crtc
);
1137 const struct intel_plane_state
*plane_state
=
1138 intel_atomic_get_new_plane_state(state
, plane
);
1139 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1140 struct intel_fbc_state_cache
*cache
= &fbc
->state_cache
;
1142 if (!plane
->has_fbc
|| !plane_state
)
1145 mutex_lock(&fbc
->lock
);
1148 if (fbc
->crtc
!= crtc
||
1149 !intel_fbc_cfb_size_changed(dev_priv
))
1152 __intel_fbc_disable(dev_priv
);
1155 drm_WARN_ON(&dev_priv
->drm
, fbc
->active
);
1157 intel_fbc_update_state_cache(crtc
, crtc_state
, plane_state
);
1159 /* FIXME crtc_state->enable_fbc lies :( */
1160 if (!cache
->plane
.visible
)
1163 if (intel_fbc_alloc_cfb(dev_priv
,
1164 intel_fbc_calculate_cfb_size(dev_priv
, cache
),
1165 plane_state
->hw
.fb
->format
->cpp
[0])) {
1166 cache
->plane
.visible
= false;
1167 fbc
->no_fbc_reason
= "not enough stolen memory";
1171 if ((IS_GEN9_BC(dev_priv
) || IS_BROXTON(dev_priv
)) &&
1172 plane_state
->hw
.fb
->modifier
!= I915_FORMAT_MOD_X_TILED
)
1173 cache
->gen9_wa_cfb_stride
=
1174 DIV_ROUND_UP(cache
->plane
.src_w
, 32 * fbc
->threshold
) * 8;
1176 cache
->gen9_wa_cfb_stride
= 0;
1178 DRM_DEBUG_KMS("Enabling FBC on pipe %c\n", pipe_name(crtc
->pipe
));
1179 fbc
->no_fbc_reason
= "FBC enabled but not active yet\n";
1183 mutex_unlock(&fbc
->lock
);
1187 * intel_fbc_disable - disable FBC if it's associated with crtc
1190 * This function disables FBC if it's associated with the provided CRTC.
1192 void intel_fbc_disable(struct intel_crtc
*crtc
)
1194 struct drm_i915_private
*dev_priv
= to_i915(crtc
->base
.dev
);
1195 struct intel_plane
*plane
= to_intel_plane(crtc
->base
.primary
);
1196 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1198 if (!plane
->has_fbc
)
1201 mutex_lock(&fbc
->lock
);
1202 if (fbc
->crtc
== crtc
)
1203 __intel_fbc_disable(dev_priv
);
1204 mutex_unlock(&fbc
->lock
);
1208 * intel_fbc_global_disable - globally disable FBC
1209 * @dev_priv: i915 device instance
1211 * This function disables FBC regardless of which CRTC is associated with it.
1213 void intel_fbc_global_disable(struct drm_i915_private
*dev_priv
)
1215 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1217 if (!HAS_FBC(dev_priv
))
1220 mutex_lock(&fbc
->lock
);
1222 drm_WARN_ON(&dev_priv
->drm
, fbc
->crtc
->active
);
1223 __intel_fbc_disable(dev_priv
);
1225 mutex_unlock(&fbc
->lock
);
1228 static void intel_fbc_underrun_work_fn(struct work_struct
*work
)
1230 struct drm_i915_private
*dev_priv
=
1231 container_of(work
, struct drm_i915_private
, fbc
.underrun_work
);
1232 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1234 mutex_lock(&fbc
->lock
);
1236 /* Maybe we were scheduled twice. */
1237 if (fbc
->underrun_detected
|| !fbc
->crtc
)
1240 DRM_DEBUG_KMS("Disabling FBC due to FIFO underrun.\n");
1241 fbc
->underrun_detected
= true;
1243 intel_fbc_deactivate(dev_priv
, "FIFO underrun");
1245 mutex_unlock(&fbc
->lock
);
1249 * intel_fbc_reset_underrun - reset FBC fifo underrun status.
1250 * @dev_priv: i915 device instance
1252 * See intel_fbc_handle_fifo_underrun_irq(). For automated testing we
1253 * want to re-enable FBC after an underrun to increase test coverage.
1255 int intel_fbc_reset_underrun(struct drm_i915_private
*dev_priv
)
1259 cancel_work_sync(&dev_priv
->fbc
.underrun_work
);
1261 ret
= mutex_lock_interruptible(&dev_priv
->fbc
.lock
);
1265 if (dev_priv
->fbc
.underrun_detected
) {
1266 DRM_DEBUG_KMS("Re-allowing FBC after fifo underrun\n");
1267 dev_priv
->fbc
.no_fbc_reason
= "FIFO underrun cleared";
1270 dev_priv
->fbc
.underrun_detected
= false;
1271 mutex_unlock(&dev_priv
->fbc
.lock
);
1277 * intel_fbc_handle_fifo_underrun_irq - disable FBC when we get a FIFO underrun
1278 * @dev_priv: i915 device instance
1280 * Without FBC, most underruns are harmless and don't really cause too many
1281 * problems, except for an annoying message on dmesg. With FBC, underruns can
1282 * become black screens or even worse, especially when paired with bad
1283 * watermarks. So in order for us to be on the safe side, completely disable FBC
1284 * in case we ever detect a FIFO underrun on any pipe. An underrun on any pipe
1285 * already suggests that watermarks may be bad, so try to be as safe as
1288 * This function is called from the IRQ handler.
1290 void intel_fbc_handle_fifo_underrun_irq(struct drm_i915_private
*dev_priv
)
1292 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1294 if (!HAS_FBC(dev_priv
))
1297 /* There's no guarantee that underrun_detected won't be set to true
1298 * right after this check and before the work is scheduled, but that's
1299 * not a problem since we'll check it again under the work function
1300 * while FBC is locked. This check here is just to prevent us from
1301 * unnecessarily scheduling the work, and it relies on the fact that we
1302 * never switch underrun_detect back to false after it's true. */
1303 if (READ_ONCE(fbc
->underrun_detected
))
1306 schedule_work(&fbc
->underrun_work
);
1310 * The DDX driver changes its behavior depending on the value it reads from
1311 * i915.enable_fbc, so sanitize it by translating the default value into either
1312 * 0 or 1 in order to allow it to know what's going on.
1314 * Notice that this is done at driver initialization and we still allow user
1315 * space to change the value during runtime without sanitizing it again. IGT
1316 * relies on being able to change i915.enable_fbc at runtime.
1318 static int intel_sanitize_fbc_option(struct drm_i915_private
*dev_priv
)
1320 if (i915_modparams
.enable_fbc
>= 0)
1321 return !!i915_modparams
.enable_fbc
;
1323 if (!HAS_FBC(dev_priv
))
1326 if (IS_BROADWELL(dev_priv
) || INTEL_GEN(dev_priv
) >= 9)
1332 static bool need_fbc_vtd_wa(struct drm_i915_private
*dev_priv
)
1334 /* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
1335 if (intel_vtd_active() &&
1336 (IS_SKYLAKE(dev_priv
) || IS_BROXTON(dev_priv
))) {
1337 DRM_INFO("Disabling framebuffer compression (FBC) to prevent screen flicker with VT-d enabled\n");
1345 * intel_fbc_init - Initialize FBC
1346 * @dev_priv: the i915 device
1348 * This function might be called during PM init process.
1350 void intel_fbc_init(struct drm_i915_private
*dev_priv
)
1352 struct intel_fbc
*fbc
= &dev_priv
->fbc
;
1354 INIT_WORK(&fbc
->underrun_work
, intel_fbc_underrun_work_fn
);
1355 mutex_init(&fbc
->lock
);
1356 fbc
->active
= false;
1358 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
1359 mkwrite_device_info(dev_priv
)->display
.has_fbc
= false;
1361 if (need_fbc_vtd_wa(dev_priv
))
1362 mkwrite_device_info(dev_priv
)->display
.has_fbc
= false;
1364 i915_modparams
.enable_fbc
= intel_sanitize_fbc_option(dev_priv
);
1365 DRM_DEBUG_KMS("Sanitized enable_fbc value: %d\n",
1366 i915_modparams
.enable_fbc
);
1368 if (!HAS_FBC(dev_priv
)) {
1369 fbc
->no_fbc_reason
= "unsupported by this chipset";
1373 /* This value was pulled out of someone's hat */
1374 if (INTEL_GEN(dev_priv
) <= 4 && !IS_GM45(dev_priv
))
1375 intel_de_write(dev_priv
, FBC_CONTROL
,
1376 500 << FBC_CTL_INTERVAL_SHIFT
);
1378 /* We still don't have any sort of hardware state readout for FBC, so
1379 * deactivate it in case the BIOS activated it to make sure software
1380 * matches the hardware state. */
1381 if (intel_fbc_hw_is_active(dev_priv
))
1382 intel_fbc_hw_deactivate(dev_priv
);