This pair of chipsets seem broken beyond repair, specifically the
erratum that causes the wrong PTE entry to be invalidated, so disable
our incorrect attempts to use the BLT on those devices.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Always avoid direct rendering to the uncached scanout buffer,
redirecting all 2D access to the shadow instead. Then for the couple of
platforms where either the BLT is not ready or cannot be trusted (i8xx)
perform the front buffer fixup using the uncached writes from the CPU.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Even with the minimal use of the BLT to copy from the GTT shadow to the
GTT scanout, i830 was still hanging. Just write to the scanout directly.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Chris Wilson