drm/amdgpu: clarify why we evict vram twice on suspend
Update the comment to explain why we do this.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 9df66d1..afeb7ab 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1982,7 +1982,10 @@ int amdgpu_device_suspend(struct drm_device *dev, bool suspend, bool fbcon)
r = amdgpu_suspend(adev);
- /* evict remaining vram memory */
+ /* evict remaining vram memory
+ * This second call to evict vram is to evict the gart page table
+ * using the CPU.
+ */
amdgpu_bo_evict_vram(adev);
pci_save_state(dev->pdev);