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Merge branch 'drm-fixes-5.0' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

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Fix for variable refresh rate stuttering

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexdeucher@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190227192115.14597-1-alexander.deucher@amd.com
This commit is contained in:
Dave Airlie 2019-02-28 12:39:59 +10:00
commit 90b5e58ebe
2 changed files with 24 additions and 4 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
View File

@ -405,6 +405,7 @@ struct amdgpu_crtc {
struct amdgpu_flip_work *pflip_works;
enum amdgpu_flip_status pflip_status;
int deferred_flip_completion;
u64 last_flip_vblank;
/* pll sharing */
struct amdgpu_atom_ss ss;
bool ss_enabled;

27
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -303,12 +303,11 @@ static void dm_pflip_high_irq(void *interrupt_params)
return;
}
/* Update to correct count(s) if racing with vblank irq */
amdgpu_crtc->last_flip_vblank = drm_crtc_accurate_vblank_count(&amdgpu_crtc->base);
/* wake up userspace */
if (amdgpu_crtc->event) {
/* Update to correct count(s) if racing with vblank irq */
drm_crtc_accurate_vblank_count(&amdgpu_crtc->base);
drm_crtc_send_vblank_event(&amdgpu_crtc->base, amdgpu_crtc->event);
/* page flip completed. clean up */
@ -4828,6 +4827,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
to_dm_crtc_state(drm_atomic_get_old_crtc_state(state, pcrtc));
int planes_count = 0;
unsigned long flags;
u64 last_flip_vblank;
bool vrr_active = acrtc_state->freesync_config.state == VRR_STATE_ACTIVE_VARIABLE;
/* update planes when needed */
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
@ -4859,6 +4860,16 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
/* In commit tail framework this cannot happen */
WARN_ON(1);
}
/* For variable refresh rate mode only:
* Get vblank of last completed flip to avoid > 1 vrr flips per
* video frame by use of throttling, but allow flip programming
* anywhere in the possibly large variable vrr vblank interval
* for fine-grained flip timing control and more opportunity to
* avoid stutter on late submission of amdgpu_dm_do_flip() calls.
*/
last_flip_vblank = acrtc_attach->last_flip_vblank;
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
if (!pflip_needed || plane->type == DRM_PLANE_TYPE_OVERLAY) {
@ -4882,10 +4893,18 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
if (plane->type == DRM_PLANE_TYPE_PRIMARY)
drm_crtc_vblank_get(crtc);
/* Use old throttling in non-vrr fixed refresh rate mode
* to keep flip scheduling based on target vblank counts
* working in a backwards compatible way, e.g., clients
* using GLX_OML_sync_control extension.
*/
if (!vrr_active)
last_flip_vblank = drm_crtc_vblank_count(crtc);
amdgpu_dm_do_flip(
crtc,
fb,
(uint32_t)drm_crtc_vblank_count(crtc) + *wait_for_vblank,
(uint32_t) last_flip_vblank + *wait_for_vblank,
dc_state);
}