[PATCH 2/2] drm/amdgpu: Don't use WC for VRAM if !AMDGPU_GEM_CREATE_CPU_GTT_USWC

[Huacai Chen]

Though AMDGPU_GEM_CREATE_CPU_GTT_USWC is initially used for GTT, but
this flag is bound to drm_arch_can_wc_memory(), and if arch doesn't
support WC, then VRAM should not use WC.

Signed-off-by: Huacai Chen <chenhc at lemote.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 5ac7b55..04299f5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -136,8 +136,10 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
 
 		places[c].fpfn = 0;
 		places[c].lpfn = 0;
-		places[c].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
-			TTM_PL_FLAG_VRAM;
+		places[c].flags = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
+
+		if (flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC)
+			places[c].flags |= TTM_PL_FLAG_WC;
 
 		if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED)
 			places[c].lpfn = visible_pfn;
-- 
2.7.0