drm/radeon: Ignore RADEON_GEM_GTT_WC on 32-bit x86

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84627
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 99a960a..4c0d786 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -213,6 +213,13 @@ 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);