From: Laurent Pinchart Date: Thu, 13 Jul 2017 22:26:52 +0000 (+0300) Subject: drm: rcar-du: Wait for flip completion instead of vblank in commit tail X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d6160246f651b7cbd370408248f95c3bea8c24ed;p=openwrt%2Fstaging%2Fblogic.git drm: rcar-du: Wait for flip completion instead of vblank in commit tail 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 Reviewed-by: Kieran Bingham --- diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index 066b62924618..7278b9703c15 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -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); }