[PATCH 4.18 185/235] drm/nouveau/debugfs: Wake up GPU before doing any reclocking

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Karol Herbst <karolher...@gmail.com>

[ Upstream commit eaeb9010bb4bcdc20e58254fa42f3fe730a7f908 ]

Fixes various reclocking related issues on prime systems.

Signed-off-by: Karol Herbst <karolher...@gmail.com>
Signed-off-by: Martin Peres <martin.pe...@free.fr>
Signed-off-by: Ben Skeggs <bske...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/gpu/drm/nouveau/nouveau_debugfs.c |    4 ++++
 1 file changed, 4 insertions(+)

--- 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 *
                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;