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drm: rcar-du: Wait for flip completion instead of vblank in commit tail

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Page flips can take more than one vertical blanking to complete if
arming the page flips races with the vertical blanking interrupt.
Waiting for one vblank to complete the atomic commit in the commit tail
handler is thus incorrect, and can lead to framebuffers being released
while still being scanned out.

Fix this by waiting for flip completion instead, using the
drm_atomic_helper_wait_for_flip_done() helper.

Fixes: 0d230422d256 ("drm: rcar-du: Register a completion callback with VSP1")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2017-07-14 01:26:52 +03:00
parent cbbb90b0c0
commit d6160246f6
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/rcar-du/rcar_du_kms.c
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@ -262,7 +262,7 @@ static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
drm_atomic_helper_commit_modeset_enables(dev, old_state);
drm_atomic_helper_commit_hw_done(old_state);
drm_atomic_helper_wait_for_vblanks(dev, old_state);
drm_atomic_helper_wait_for_flip_done(dev, old_state);
drm_atomic_helper_cleanup_planes(dev, old_state);
}