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drm/radeon: mask out WC from BO on unsupported arches

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Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Oded Gabbay 2016-01-30 07:59:33 +02:00 committed by Alex Deucher
parent 4b0e4e4af6
commit c524498739
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/radeon/radeon_object.c
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@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/radeon_drm.h>
#include <drm/drm_cache.h>
#include "radeon.h"
#include "radeon_trace.h"
@ -245,6 +246,12 @@ int radeon_bo_create(struct radeon_device *rdev,
DRM_INFO_ONCE("Please enable CONFIG_MTRR and CONFIG_X86_PAT for "
"better performance thanks to write-combining\n");
bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
#else
/* For architectures that don't support WC memory,
* mask out the WC flag from the BO
*/
if (!drm_arch_can_wc_memory())
bo->flags &= ~RADEON_GEM_GTT_WC;
#endif
radeon_ttm_placement_from_domain(bo, domain);