linux-kernel - [PATCH 5.15 037/135] drm/msm: Switch ordering of runpm put vs devfreq

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Message-Id: <20220627111939.235945076@linuxfoundation.org>
Date:   Mon, 27 Jun 2022 13:20:44 +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, Rob Clark <robdclark@...omium.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Douglas Anderson <dianders@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 037/135] drm/msm: Switch ordering of runpm put vs devfreq_idle

From: Rob Clark <robdclark@...omium.org>

[ Upstream commit 49e477610087a02c3604061b8f3ee3a25a493987 ]

In msm_devfreq_suspend() we cancel idle_work synchronously so that it
doesn't run after we power of the hw or in the resume path.  But this
means that we want to ensure that idle_work is not scheduled *after* we
no longer hold a runpm ref.  So switch the ordering of pm_runtime_put()
vs msm_devfreq_idle().

v2. Only move the runpm _put_autosuspend, and not the _mark_last_busy()

Fixes: 9bc95570175a ("drm/msm: Devfreq tuning")
Signed-off-by: Rob Clark <robdclark@...omium.org>
Link: https://lore.kernel.org/r/20210927152928.831245-1-robdclark@gmail.com
Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Link: https://lore.kernel.org/r/20220608161334.2140611-1-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 2c46cd968ac4..b01d0a521c90 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -658,7 +658,6 @@ static void retire_submit(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
 	msm_submit_retire(submit);
 
 	pm_runtime_mark_last_busy(&gpu->pdev->dev);
-	pm_runtime_put_autosuspend(&gpu->pdev->dev);
 
 	spin_lock_irqsave(&ring->submit_lock, flags);
 	list_del(&submit->node);
@@ -672,6 +671,8 @@ static void retire_submit(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
 		msm_devfreq_idle(gpu);
 	mutex_unlock(&gpu->active_lock);
 
+	pm_runtime_put_autosuspend(&gpu->pdev->dev);
+
 	msm_gem_submit_put(submit);
 }
 
-- 
2.35.1