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drm/radeon: Disable uncacheable CPU mappings of GTT with RV6xx

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They reportedly cause random GPU hangs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91268

Reviewed-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer 2015-11-05 17:25:26 +09:00 committed by Alex Deucher
parent 5bad7d29a7
commit 96ea47c0ec
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/radeon_object.c
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@ -221,6 +221,12 @@ int radeon_bo_create(struct radeon_device *rdev,
if (!(rdev->flags & RADEON_IS_PCIE))
bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
/* Write-combined CPU mappings of GTT cause GPU hangs with RV6xx
* See https://bugs.freedesktop.org/show_bug.cgi?id=91268
*/
if (rdev->family >= CHIP_RV610 && rdev->family <= CHIP_RV635)
bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
#ifdef CONFIG_X86_32
/* XXX: Write-combined CPU mappings of GTT seem broken on 32-bit
* See https://bugs.freedesktop.org/show_bug.cgi?id=84627