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If we find the GPU didn't update the CSB within 50us, we currently fail and eventually reset the GPU. Lets report the value from the mmio space as a last resort, it may just stave off an unnecessary GPU reset. References: HSDES#22011327657 Suggested-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200915134923.30088-4-chris@chris-wilson.co.uk