drm/radeon: Disable uncacheable CPU mappings of GTT with RV6xx
They reportedly cause random GPU hangs. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91268Reviewed-by: NChristian König <christian.koenig@amd.com> Cc: stable@vger.kernel.org Signed-off-by: NMichel Dänzer <michel.daenzer@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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