linux-kernel - [PATCH 5.13 549/800] drm/msm/disp/dpu1: avoid perf update in frame done event

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Message-Id: <20210712061025.788671801@linuxfoundation.org>
Date:   Mon, 12 Jul 2021 08:09:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Krishna Manikandan <mkrishn@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 549/800] drm/msm/disp/dpu1: avoid perf update in frame done event

From: Krishna Manikandan <mkrishn@...eaurora.org>

[ Upstream commit a1f2ba60eace242fd034173db3762f342a824a2e ]

Crtc perf update from frame event work can result in
wrong bandwidth and clock update from dpu if the work
is scheduled after the swap state has happened.

Avoid such issues by moving perf update to complete
commit once the frame is accepted by the hardware.

Fixes: a29c8c024165 ("drm/msm/disp/dpu1: fix display underruns during modeset")
Signed-off-by: Krishna Manikandan <mkrishn@...eaurora.org>
Tested-by: Douglas Anderson <dianders@...omium.org>
Link: https://lore.kernel.org/r/1622092076-5100-1-git-send-email-mkrishn@codeaurora.org
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 18bc76b7f1a3..4523d6ba891b 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -407,9 +407,6 @@ static void dpu_crtc_frame_event_work(struct kthread_work *work)
 								fevent->event);
 		}
 
-		if (fevent->event & DPU_ENCODER_FRAME_EVENT_DONE)
-			dpu_core_perf_crtc_update(crtc, 0, false);
-
 		if (fevent->event & (DPU_ENCODER_FRAME_EVENT_DONE
 					| DPU_ENCODER_FRAME_EVENT_ERROR))
 			frame_done = true;
@@ -477,6 +474,7 @@ static void dpu_crtc_frame_event_cb(void *data, u32 event)
 void dpu_crtc_complete_commit(struct drm_crtc *crtc)
 {
 	trace_dpu_crtc_complete_commit(DRMID(crtc));
+	dpu_core_perf_crtc_update(crtc, 0, false);
 	_dpu_crtc_complete_flip(crtc);
 }
 
-- 
2.30.2