tree f0571e967571171c7aba0e38f570178c07e4b42c
parent ea68394342605bad4a1c2bc8c30de4209b4ffac3
author Robert Beckett <bob.beckett@collabora.com> 1561485553 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1562745346 +0200

drm/imx: notify drm core before sending event during crtc disable

commit 78c68e8f5cd24bd32ba4ca1cdfb0c30cf0642685 upstream.

Notify drm core before sending pending events during crtc disable.
This fixes the first event after disable having an old stale timestamp
by having drm_crtc_vblank_off update the timestamp to now.

This was seen while debugging weston log message:
Warning: computed repaint delay is insane: -8212 msec

This occurred due to:
1. driver starts up
2. fbcon comes along and restores fbdev, enabling vblank
3. vblank_disable_fn fires via timer disabling vblank, keeping vblank
seq number and time set at current value
(some time later)
4. weston starts and does a modeset
5. atomic commit disables crtc while it does the modeset
6. ipu_crtc_atomic_disable sends vblank with old seq number and time

Fixes: a474478642d5 ("drm/imx: fix crtc vblank state regression")

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>