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drm/amd/display: enable idle optimizations for linux (MALL stutter) 

[Why]
We can only use this feature when the display is idle. When active vblank
irq count is 0 we know all the displays are idle.

[How]
-Add a active vblank irq counter
-Update the counter when we enable/disable vblank irq
-if vblank irq count is 0 we can consider mall stutter

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Nick Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Bhawanpreet Lakha 2020-07-30 17:03:49 -04:00 committed by Alex Deucher
parent e74c8a4611
commit 71338cb4a7
2 changed files with 27 additions and 1 deletions
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21
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -5413,6 +5413,7 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
struct amdgpu_device *adev = drm_to_adev(crtc->dev);
struct dm_crtc_state *acrtc_state = to_dm_crtc_state(crtc->state);
struct amdgpu_display_manager *dm = &adev->dm;
int rc = 0;
if (enable) {
@ -5428,7 +5429,25 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
return rc;
irq_source = IRQ_TYPE_VBLANK + acrtc->otg_inst;
return dc_interrupt_set(adev->dm.dc, irq_source, enable) ? 0 : -EBUSY;
if (!dc_interrupt_set(adev->dm.dc, irq_source, enable))
return -EBUSY;
mutex_lock(&dm->dc_lock);
if (enable)
dm->active_vblank_irq_count++;
else
dm->active_vblank_irq_count--;
dc_allow_idle_optimizations(
adev->dm.dc, dm->active_vblank_irq_count == 0 ? true : false);
DRM_DEBUG_DRIVER("Allow idle optimizations (MALL): %d\n", dm->active_vblank_irq_count == 0);
mutex_unlock(&dm->dc_lock);
return 0;
}
static int dm_enable_vblank(struct drm_crtc *crtc)

7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@ -336,6 +336,13 @@ struct amdgpu_display_manager {
*/
const struct gpu_info_soc_bounding_box_v1_0 *soc_bounding_box;
/**
* @active_vblank_irq_count
*
* number of currently active vblank irqs
*/
uint32_t active_vblank_irq_count;
#ifdef CONFIG_DEBUG_FS
/**
* @crc_win_x_start_property: