On 05.11.2015 09:25, Michel Dänzer wrote:
From: Michel Dänzer <michel.daenzer@xxxxxxx>
They reportedly cause random GPU hangs.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91268
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michel Dänzer <michel.daenzer@xxxxxxx>
For this series Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_object.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index d302488..a35f5af 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -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
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