From: Monk Liu <Monk.Liu@amd.com>
Date: Wed, 1 Jun 2016 21:37:21 +0000 (-0400)
Subject: drm/amdgpu: clear RB at ring init
X-Git-Tag: v4.8-rc1~62^2~23^2~190
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cc7d8c79792e626546ef7ef7086882b2c83b89e1;p=karo-tx-linux.git

drm/amdgpu: clear RB at ring init

This help fix reloading driver hang issue of SDMA
ring.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 870f9494252c..dc8a7bbedfea 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -310,6 +310,9 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
 		}
 		r = amdgpu_bo_kmap(ring->ring_obj,
 				       (void **)&ring->ring);
+
+		memset((void *)ring->ring, 0, ring->ring_size);
+
 		amdgpu_bo_unreserve(ring->ring_obj);
 		if (r) {
 			dev_err(adev->dev, "(%d) ring map failed\n", r);