linux-kernel - [PATCH AUTOSEL 4.14 30/57] drm/nouveau/debugfs: Wake up GPU before doing any reclocking

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Message-ID: <20180915013223.179909-30-alexander.levin@microsoft.com>
Date:   Sat, 15 Sep 2018 01:32:48 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Karol Herbst <karolherbst@...il.com>,
        Martin Peres <martin.peres@...e.fr>,
        Ben Skeggs <bskeggs@...hat.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.14 30/57] drm/nouveau/debugfs: Wake up GPU before
 doing any reclocking

From: Karol Herbst <karolherbst@...il.com>

[ Upstream commit eaeb9010bb4bcdc20e58254fa42f3fe730a7f908 ]

Fixes various reclocking related issues on prime systems.

Signed-off-by: Karol Herbst <karolherbst@...il.com>
Signed-off-by: Martin Peres <martin.peres@...e.fr>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/drm/nouveau/nouveau_debugfs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 963a4dba8213..9109b69cd052 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -160,7 +160,11 @@ nouveau_debugfs_pstate_set(struct file *file, const char __user *ubuf,
 		args.ustate = value;
 	}
 
+	ret = pm_runtime_get_sync(drm->dev);
+	if (IS_ERR_VALUE(ret) && ret != -EACCES)
+		return ret;
 	ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_USER, &args, sizeof(args));
+	pm_runtime_put_autosuspend(drm->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.17.1