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commit29ffeb73b2upstream. num_gb_pipes was set to a wrong value using r420_pipe_config This have lead to HyperZ glitches on fast Z clearing. Closes: https://bugs.freedesktop.org/show_bug.cgi?id=110897 Reviewed-by: Marek Olšák <marek.olsak@amd.com> Signed-off-by: Richard Thier <u9vata@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit044e59a85c) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>