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drm/radeon: Use write-combined CPU mappings of ring buffers with PCIe 

PCI GART doesn't support unsnooped access. AGP GART already uses
write-combined CPU mappings.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer 2014-07-29 18:47:20 +09:00 committed by Alex Deucher
parent 5dc355325b
commit 1490434f0d
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/radeon/radeon_ring.c
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@ -640,7 +640,9 @@ int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsig
/* Allocate ring buffer */
if (ring->ring_obj == NULL) {
r = radeon_bo_create(rdev, ring->ring_size, PAGE_SIZE, true,
RADEON_GEM_DOMAIN_GTT, 0,
RADEON_GEM_DOMAIN_GTT,
(rdev->flags & RADEON_IS_PCIE) ?
RADEON_GEM_GTT_WC : 0,
NULL, &ring->ring_obj);
if (r) {
dev_err(rdev->dev, "(%d) ring create failed\n", r);