On Fri, 30 Oct 2020 14:58:33 +0000 Steven Price steven.price@arm.com wrote:
When unloading the call to pm_runtime_put_sync_suspend() will attempt to turn the GPU cores off, however panfrost_device_fini() will have turned the clocks off. This leads to the hardware locking up.
Instead don't call pm_runtime_put_sync_suspend() and instead simply mark the device as suspended using pm_runtime_set_suspended(). And also include this on the error path in panfrost_probe().
Fixes: aebe8c22a912 ("drm/panfrost: Fix possible suspend in panfrost_remove") Signed-off-by: Steven Price steven.price@arm.com
Queued to drm-misc-fixes.
Thanks,
Boris
drivers/gpu/drm/panfrost/panfrost_drv.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index 23513869500c..0ac8ad18fdc6 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -627,6 +627,7 @@ static int panfrost_probe(struct platform_device *pdev) err_out1: pm_runtime_disable(pfdev->dev); panfrost_device_fini(pfdev);
- pm_runtime_set_suspended(pfdev->dev);
err_out0: drm_dev_put(ddev); return err; @@ -641,9 +642,9 @@ static int panfrost_remove(struct platform_device *pdev) panfrost_gem_shrinker_cleanup(ddev);
pm_runtime_get_sync(pfdev->dev);
- panfrost_device_fini(pfdev);
- pm_runtime_put_sync_suspend(pfdev->dev); pm_runtime_disable(pfdev->dev);
panfrost_device_fini(pfdev);
pm_runtime_set_suspended(pfdev->dev);
drm_dev_put(ddev); return 0;