[PATCH] drm/radeon: Ignore RADEON_GEM_GTT_WC on 32-bit x86

[Michel Dänzer]

From: Michel Dänzer <michel.daen...@amd.com>

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84627
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 drivers/gpu/drm/radeon/radeon_object.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_object.c 
b/drivers/gpu/drm/radeon/radeon_object.c
index 33e6c7a..d4f472b 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -233,6 +233,13 @@ int radeon_bo_create(struct radeon_device *rdev,
        if (!(rdev->flags & RADEON_IS_PCIE))
                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
+        */
+       bo->flags &= ~RADEON_GEM_GTT_WC;
+#endif
+
        radeon_ttm_placement_from_domain(bo, domain);
        /* Kernel allocation are uninterruptible */
        down_read(&rdev->pm.mclk_lock);
-- 
2.1.3