This is a note to let you know that I've just added the patch titled
drm/msm/adreno: fix runtime PM imbalance at gpu load
to the 5.15-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-fix-runtime-pm-imbalance-at-gpu-load.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 854bbaeef7c21e7ac7894cccf342c41245ffebfc
Author: Johan Hovold <johan+linaro@xxxxxxxxxx>
Date: Fri Mar 3 17:48:05 2023 +0100
drm/msm/adreno: fix runtime PM imbalance at gpu load
[ Upstream commit 0d997f95b70f98987ae031a89677c13e0e223670 ]
A recent commit moved enabling of runtime PM to GPU load time (first
open()) but failed to update the error paths so that runtime PM is
disabled if initialisation of the GPU fails. This would trigger a
warning about the unbalanced disable count on the next open() attempt.
Note that pm_runtime_put_noidle() is sufficient to balance the usage
count when pm_runtime_put_sync() fails (and is chosen over
pm_runtime_resume_and_get() for consistency reasons).
Fixes: 4b18299b3365 ("drm/msm/adreno: Defer enabling runpm until hw_init()")
Cc: stable@xxxxxxxxxxxxxxx # 6.0
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/524971/
Link: https://lore.kernel.org/r/20230303164807.13124-3-johan+linaro@xxxxxxxxxx
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
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 afdfa9edbea3d..7c3d80e78fb8b 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -406,20 +406,21 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0) {
- pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_put_noidle(&pdev->dev);
DRM_DEV_ERROR(dev->dev, "Couldn't power up the GPU: %d\n", ret);
- return NULL;
+ goto err_disable_rpm;
}
mutex_lock(&gpu->lock);
ret = msm_gpu_hw_init(gpu);
mutex_unlock(&gpu->lock);
- pm_runtime_put_autosuspend(&pdev->dev);
if (ret) {
DRM_DEV_ERROR(dev->dev, "gpu hw init failed: %d\n", ret);
- return NULL;
+ goto err_put_rpm;
}
+ pm_runtime_put_autosuspend(&pdev->dev);
+
#ifdef CONFIG_DEBUG_FS
if (gpu->funcs->debugfs_init) {
gpu->funcs->debugfs_init(gpu, dev->primary);
@@ -428,6 +429,13 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
#endif
return gpu;
+
+err_put_rpm:
+ pm_runtime_put_sync(&pdev->dev);
+err_disable_rpm:
+ pm_runtime_disable(&pdev->dev);
+
+ return NULL;
}
static void set_gpu_pdev(struct drm_device *dev,
