[v2,08/15] drm/amdgpu: Forbid runtime pm on driver unload
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Message ID ccd4f7208acbd7761364418fc34f7849acbb4597.1465392124.git.lukas@wunner.de
State New
Headers show

Commit Message

Lukas Wunner June 8, 2016, 4:47 p.m. UTC
The PCI core calls pm_runtime_forbid() on device probe in pci_pm_init(),
making this the default state when amdgpu is loaded.
amdgpu_driver_load_kms() therefore calls pm_runtime_allow(), but there's
no pm_runtime_forbid() in amdgpu_driver_unload_kms() to balance it. Add
it so that we leave the device in the same state that we found it.

This isn't a bug, it's just good housekeeping. When amdgpu is first
loaded with runpm=1, then unloaded and loaded again with runpm=0,
pm_runtime_forbid() will be called from amdgpu_pmops_runtime_idle() or
amdgpu_pmops_runtime_suspend(), so the behaviour is correct. If there
ever is a third party driver for AMD cards, this commit avoids that it
has to clean up behind amdgpu.

Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 0db692e..38a28d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -62,6 +62,7 @@  int amdgpu_driver_unload_kms(struct drm_device *dev)
 
 	if (amdgpu_device_is_px(dev)) {
 		pm_runtime_get_sync(dev->dev);
+		pm_runtime_forbid(dev->dev);
 	}
 
 	amdgpu_amdkfd_device_fini(adev);