This is a note to let you know that I've just added the patch titled
drm/msm/adreno: Defer enabling runpm until hw_init()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-adreno-defer-enabling-runpm-until-hw_init.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9ec3eefdba64497e3a54f6a557ac12d74784684e
Author: Rob Clark <robdclark@xxxxxxxxxxxx>
Date: Mon Jun 13 11:20:30 2022 -0700
drm/msm/adreno: Defer enabling runpm until hw_init()
[ Upstream commit 4b18299b33655fa9672b774b6df774dc03d6aee8 ]
To avoid preventing the display from coming up before the rootfs is
mounted, without resorting to packing fw in the initrd, the GPU has
this limbo state where the device is probed, but we aren't ready to
start sending commands to it. This is particularly problematic for
a6xx, since the GMU (which requires fw to be loaded) is the one that
is controlling the power/clk/icc votes.
So defer enabling runpm until we are ready to call gpu->hw_init(),
as that is a point where we know we have all the needed fw and are
ready to start sending commands to the coproc's.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/489337/
Link: https://lore.kernel.org/r/20220613182036.2567963-1-robdclark@xxxxxxxxx
Stable-dep-of: db7662d076c9 ("drm/msm/adreno: drop bogus pm_runtime_set_active()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 7d3e9a129ac74..0275be7e13b19 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -190,6 +190,12 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
if (ret)
return NULL;
+ /*
+ * Now that we have firmware loaded, and are ready to begin
+ * booting the gpu, go ahead and enable runpm:
+ */
+ pm_runtime_enable(&pdev->dev);
+
/* Make sure pm runtime is active and reset any previous errors */
pm_runtime_set_active(&pdev->dev);
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index c9f831604558f..6da144c394097 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -725,7 +725,6 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
pm_runtime_set_autosuspend_delay(&pdev->dev,
adreno_gpu->info->inactive_period);
pm_runtime_use_autosuspend(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
return msm_gpu_init(drm, pdev, &adreno_gpu->base, &funcs->base,
adreno_gpu->info->name, &adreno_gpu_config);
