[Nouveau] [PATCH 9/9] clk: Check pm_runtime status before reclocking

[Karol Herbst]

We don't want to change anything on the GPU if it's suspended. Also we
need to increase the refcount on the pm_runtime counter so that the GPU
won't be suspended while reclocking.

Signed-off-by: Karol Herbst <karolherbst at gmail.com>
---
 drm/nouveau/nvkm/subdev/clk/base.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drm/nouveau/nvkm/subdev/clk/base.c b/drm/nouveau/nvkm/subdev/clk/base.c
index bc65906e..143ce0ea 100644
--- a/drm/nouveau/nvkm/subdev/clk/base.c
+++ b/drm/nouveau/nvkm/subdev/clk/base.c
@@ -320,6 +320,7 @@ nvkm_clk_update_work(struct work_struct *work)
 {
 	struct nvkm_clk *clk = container_of(work, typeof(*clk), work);
 	struct nvkm_subdev *subdev = &clk->subdev;
+	struct device *dev = subdev->device->dev;
 	int pstate;
 
 	if (!atomic_xchg(&clk->waiting, 0))
@@ -345,7 +346,14 @@ nvkm_clk_update_work(struct work_struct *work)
 		pstate = NVKM_CLK_PSTATE_DEFAULT;
 	}
 
-	clk->func->update(clk, pstate);
+	// only call into the code if the GPU is powered on
+	if (!pm_runtime_suspended(dev)) {
+		// it would be a shame if the GPU goes into suspend
+		// while doing the reclock
+		pm_runtime_get_sync(dev);
+		clk->func->update(clk, pstate);
+		pm_runtime_put(dev);
+	}
 
 	wake_up_all(&clk->wait);
 	nvkm_notify_get(&clk->pwrsrc_ntfy);
-- 
2.12.0