Patch "drm/msm/mdp4: flush vblank event on disable" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/msm/mdp4: flush vblank event on disable

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-msm-mdp4-flush-vblank-event-on-disable.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3029a90bb28450455c9ed808741ca04c1df9b5ca
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date:   Tue Nov 28 00:54:01 2023 +0300

    drm/msm/mdp4: flush vblank event on disable
    
    [ Upstream commit c6721b3c6423d8a348ae885a0f4c85e14f9bf85c ]
    
    Flush queued events when disabling the crtc. This avoids timeouts when
    we come back and wait for dependencies (like the previous frame's
    flip_done).
    
    Fixes: c8afe684c95c ("drm/msm: basic KMS driver for snapdragon")
    Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
    Patchwork: https://patchwork.freedesktop.org/patch/569127/
    Link: https://lore.kernel.org/r/20231127215401.4064128-1-dmitry.baryshkov@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
index 169f9de4a12a..3100957225a7 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c
@@ -269,6 +269,7 @@ static void mdp4_crtc_atomic_disable(struct drm_crtc *crtc,
 {
 	struct mdp4_crtc *mdp4_crtc = to_mdp4_crtc(crtc);
 	struct mdp4_kms *mdp4_kms = get_kms(crtc);
+	unsigned long flags;
 
 	DBG("%s", mdp4_crtc->name);
 
@@ -281,6 +282,14 @@ static void mdp4_crtc_atomic_disable(struct drm_crtc *crtc,
 	mdp_irq_unregister(&mdp4_kms->base, &mdp4_crtc->err);
 	mdp4_disable(mdp4_kms);
 
+	if (crtc->state->event && !crtc->state->active) {
+		WARN_ON(mdp4_crtc->event);
+		spin_lock_irqsave(&mdp4_kms->dev->event_lock, flags);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		crtc->state->event = NULL;
+		spin_unlock_irqrestore(&mdp4_kms->dev->event_lock, flags);
+	}
+
 	mdp4_crtc->enabled = false;
 }
 




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