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alistair23-linux
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drm/msm: enable vblank during atomic commits 

This has roughly the same effect as drm_atomic_helper_wait_for_vblanks(),
basically just ensuring that vblank accounting is enabled so that we get
valid timestamp/seqn on pageflip events.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Tested-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
zero-sugar-mainline-defconfig
Rob Clark 2020-08-18 09:31:19 -07:00
parent 9d5cbf5fe4
commit 43906812ea
1 changed files with 36 additions and 0 deletions
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36
drivers/gpu/drm/msm/msm_atomic.c
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@ -27,6 +27,34 @@ int msm_atomic_prepare_fb(struct drm_plane *plane,
return msm_framebuffer_prepare(new_state->fb, kms->aspace);
}
/*
* Helpers to control vblanks while we flush.. basically just to ensure
* that vblank accounting is switched on, so we get valid seqn/timestamp
* on pageflip events (if requested)
*/
static void vblank_get(struct msm_kms *kms, unsigned crtc_mask)
{
struct drm_crtc *crtc;
for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
if (!crtc->state->active)
continue;
drm_crtc_vblank_get(crtc);
}
}
static void vblank_put(struct msm_kms *kms, unsigned crtc_mask)
{
struct drm_crtc *crtc;
for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
if (!crtc->state->active)
continue;
drm_crtc_vblank_put(crtc);
}
}
static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
{
unsigned crtc_mask = BIT(crtc_idx);
@ -44,6 +72,8 @@ static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
kms->funcs->enable_commit(kms);
vblank_get(kms, crtc_mask);
/*
* Flush hardware updates:
*/
@ -58,6 +88,8 @@ static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
kms->funcs->wait_flush(kms, crtc_mask);
trace_msm_atomic_wait_flush_finish(crtc_mask);
vblank_put(kms, crtc_mask);
mutex_lock(&kms->commit_lock);
kms->funcs->complete_commit(kms, crtc_mask);
mutex_unlock(&kms->commit_lock);
@ -221,6 +253,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
*/
kms->pending_crtc_mask &= ~crtc_mask;
vblank_get(kms, crtc_mask);
/*
* Flush hardware updates:
*/
@ -235,6 +269,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
kms->funcs->wait_flush(kms, crtc_mask);
trace_msm_atomic_wait_flush_finish(crtc_mask);
vblank_put(kms, crtc_mask);
mutex_lock(&kms->commit_lock);
kms->funcs->complete_commit(kms, crtc_mask);
mutex_unlock(&kms->commit_lock);