From 78c68e8f5cd24bd32ba4ca1cdfb0c30cf0642685 Mon Sep 17 00:00:00 2001
From: Robert Beckett <bob.beckett@collabora.com>
Date: Tue, 25 Jun 2019 18:59:13 +0100
Subject: [PATCH] drm/imx: notify drm core before sending event during crtc
disable
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>
---
drivers/gpu/drm/imx/ipuv3-crtc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 9cc1d678674f2..e04d6efff1b50 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -91,14 +91,14 @@ static void ipu_crtc_atomic_disable(struct drm_crtc *crtc,
ipu_dc_disable(ipu);
ipu_prg_disable(ipu);
+ drm_crtc_vblank_off(crtc);
+
spin_lock_irq(&crtc->dev->event_lock);
if (crtc->state->event) {
drm_crtc_send_vblank_event(crtc, crtc->state->event);
crtc->state->event = NULL;
}
spin_unlock_irq(&crtc->dev->event_lock);
-
- drm_crtc_vblank_off(crtc);
}
static void imx_drm_crtc_reset(struct drm_crtc *crtc)
--
GitLab