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drm/amd/display: In VRR mode, do DRM core vblank handling at end of vblank. (v2)

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In VRR mode, proper vblank/pageflip timestamps can only be computed
after the display scanout position has left front-porch. Therefore
delay calls to drm_crtc_handle_vblank(), and thereby calls to
drm_update_vblank_count() and pageflip event delivery, to after the
end of front-porch when in VRR mode.

We add a new vupdate irq, which triggers at the end of the vupdate
interval, ie. at the end of vblank, and calls the core vblank handler
function. The new irq handler is not executed in standard non-VRR
mode, so vblank handling for fixed refresh rate mode is identical
to the past implementation.

v2: Implement feedback by Nicholas and Paul Menzel.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Kleiner
2019-03-29 13:00:56 +01:00
committed by Alex Deucher
parent fdd1fe57c0
commit d2574c33bb
8 changed files with 204 additions and 16 deletions
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9
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
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@@ -182,6 +182,15 @@ struct amdgpu_display_manager {
struct common_irq_params
vblank_params[DC_IRQ_SOURCE_VBLANK6 - DC_IRQ_SOURCE_VBLANK1 + 1];
/**
* @vupdate_params:
*
* Vertical update IRQ parameters, passed to registered handlers when
* triggered.
*/
struct common_irq_params
vupdate_params[DC_IRQ_SOURCE_VUPDATE6 - DC_IRQ_SOURCE_VUPDATE1 + 1];
spinlock_t irq_handler_list_table_lock;
struct backlight_device *backlight_dev;