From: Frank Min <Frank.Min@amd.com>
Date: Tue, 2 May 2017 19:49:32 +0800
Subject: drm/amdgpu: clean doorbell after sending init table to mmsch
Git-commit: b48622b088ec4292e59e661d84323d7c1e6374db
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

According to HW design, need to clean doorbell after setup MMSCH
table.

Signed-off-by: Frank Min <Frank.Min@amd.com>
Signed-off-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c |    1 +
 drivers/gpu/drm/amd/amdgpu/vce_v4_0.c |    1 +
 2 files changed, 2 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
@@ -702,6 +702,7 @@ static int uvd_v7_0_mmsch_start(struct a
 		dev_err(adev->dev, "failed to init MMSCH, mmVCE_MMSCH_VF_MAILBOX_RESP = %x\n", data);
 		return -EBUSY;
 	}
+	WDOORBELL32(adev->uvd.ring_enc[0].doorbell_index, 0);
 
 	return 0;
 }
--- a/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
@@ -190,6 +190,7 @@ static int vce_v4_0_mmsch_start(struct a
 		dev_err(adev->dev, "failed to init MMSCH, mmVCE_MMSCH_VF_MAILBOX_RESP = %x\n", data);
 		return -EBUSY;
 	}
+	WDOORBELL32(adev->vce.ring[0].doorbell_index, 0);
 
 	return 0;
 }