[PATCH] drm/amdgpu: atombios stuck executing during S3 stress test

[jimqu]

Sometimes, atombios may be stucked when resume back. Duo to PCIE has
set to D3cold, the ACC of GFX adapter is power-down. it should re-init
the scratch registers. with the change, test is pass more than 80 cycles
on Fiji.

Change-Id: I9cf40c475c4a5a31216949d50cc5e30b74dc21c4
Signed-off-by: JimQu <Jim.Qu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index e82c487..bfe9a5c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2098,6 +2098,7 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon)
 				console_unlock();
 			return r;
 		}
+		amdgpu_atombios_scratch_regs_init(adev);
 	}
 
 	/* post card */
-- 
1.9.1