Update the comment to explain why we do this.

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index bfca676..b88a3b7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1958,7 +1958,10 @@ 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);
-- 
2.5.5

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