From 1490434f0da63afc6006411c8829c6a7935a4e7e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Michel=20D=C3=A4nzer?= Date: Tue, 29 Jul 2014 18:47:20 +0900 Subject: [PATCH] drm/radeon: Use write-combined CPU mappings of ring buffers with PCIe MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit PCI GART doesn't support unsnooped access. AGP GART already uses write-combined CPU mappings. Signed-off-by: Michel Dänzer Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/radeon_ring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c index 71439f0a3c26..7cfea7e4583f 100644 --- a/drivers/gpu/drm/radeon/radeon_ring.c +++ b/drivers/gpu/drm/radeon/radeon_ring.c @@ -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);