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drm/radeon: Make classic pageflip completion path less racy.

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Need to protect mmio flip programming by event lock as well.

Need to also first enable pflip irq, then mmio program,
otherwise a flip completion may get unnoticed in the vblank
of actual completion if the flip is programmed, but
radeon_flip_work_func gets preempted immediately after
mmio programming and before vblank. In that case the
vblank irq handler wouldn't run radeon_crtc_handle_vblank()
with the completion check routine, miss the completed flip,
and only notice one vblank after actual completion, causing
a false/delayed report of flip completion.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Kleiner 2014-07-17 02:24:45 +02:00 committed by Alex Deucher
parent 826484977c
commit 5f87e090a7
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/radeon/radeon_display.c
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@ -407,15 +407,15 @@ static void radeon_flip_work_func(struct work_struct *__work)
radeon_fence_unref(&work->fence);
}
/* do the flip (mmio) */
radeon_page_flip(rdev, radeon_crtc->crtc_id, work->base);
/* We borrow the event spin lock for protecting flip_status */
spin_lock_irqsave(&crtc->dev->event_lock, flags);
/* set the proper interrupt */
radeon_irq_kms_pflip_irq_get(rdev, radeon_crtc->crtc_id);
/* do the flip (mmio) */
radeon_page_flip(rdev, radeon_crtc->crtc_id, work->base);
radeon_crtc->flip_status = RADEON_FLIP_SUBMITTED;
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
up_read(&rdev->exclusive_lock);