Linux ARM-MSM sub-architecture
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From: Sharat Masetty <smasetty-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
To: freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	jcrouse-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
	Sharat Masetty <smasetty-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [PATCH v4 1/3] drm/msm: suspend devfreq on init
Date: Fri,  8 Jun 2018 11:56:05 +0530	[thread overview]
Message-ID: <1528439167-31513-2-git-send-email-smasetty@codeaurora.org> (raw)
In-Reply-To: <1528439167-31513-1-git-send-email-smasetty-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

Devfreq turns on and starts recommending power level as soon as it is
initialized. The GPU is still not powered on by the time the devfreq
init happens and this leads to problems on GPU's where register access
is needed to get/set power levels. So we start suspended and only restart
devfreq when GPU is powered on.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 1c09acf..d7586f2 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -104,6 +104,8 @@ static void msm_devfreq_init(struct msm_gpu *gpu)
 		dev_err(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n");
 		gpu->devfreq.devfreq = NULL;
 	}
+
+	devfreq_suspend_device(gpu->devfreq.devfreq);
 }
 
 static int enable_pwrrail(struct msm_gpu *gpu)
-- 
1.9.1

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  parent reply	other threads:[~2018-06-08  6:26 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-08  6:26 [PATCH v4 0/3] re-factor devfreq common code Sharat Masetty
     [not found] ` <1528439167-31513-1-git-send-email-smasetty-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-06-08  6:26   ` Sharat Masetty [this message]
2018-06-08  6:26   ` [PATCH v4 2/3] drm/msm: re-factor devfreq code Sharat Masetty
2018-06-08  6:26   ` [PATCH v4 3/3] drm/msm: unregister devfreq upon clean up Sharat Masetty
2018-06-11 14:59   ` [PATCH v4 0/3] re-factor devfreq common code Jordan Crouse

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