From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 27 Jul 2017 15:30:27 -0400
Subject: drm/amdgpu/sdma4: drop hdp flush from wptr shadow update
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Git-commit: a67094432da75d2769e7c35323f26c6873908e6c
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The wb buffer is in system memory, not vram so the flush
is useless.

Cc: Frank Min <Frank.Min@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -313,7 +313,6 @@ static void sdma_v4_0_ring_set_wptr(stru
 					offset = adev->sdma.instance[i].poll_mem_offs;
 					atomic64_set((atomic64_t *)&adev->wb.wb[offset],
 						     (ring->wptr << 2));
-					nbio_v6_1_hdp_flush(adev);
 				}
 			}
 		}