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drm/vc4: Send a VBLANK event when disabling a CRTC 

VBLANK events are missed when the CRTC is being disabled because the
driver does not wait till the end of the frame before stopping the
HVS and PV blocks. In this case, we should explicitly issue a VBLANK
event if there's one waiting.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/1497601833-24588-1-git-send-email-boris.brezillon@free-electrons.com
This commit is contained in:
Boris Brezillon 2017-06-16 10:30:33 +02:00 committed by Eric Anholt
parent 22a884cfe5
commit edeb729f79
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/vc4/vc4_crtc.c
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@ -518,6 +518,19 @@ static void vc4_crtc_disable(struct drm_crtc *crtc)
WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
(SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
SCALER_DISPSTATX_EMPTY);
/*
* Make sure we issue a vblank event after disabling the CRTC if
* someone was waiting it.
*/
if (crtc->state->event) {
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
drm_crtc_send_vblank_event(crtc, crtc->state->event);
crtc->state->event = NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
}
}
static void vc4_crtc_enable(struct drm_crtc *crtc)