drm/i915/gt: Use a mmio read of the CSB in case of failure

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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

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Chris Wilson 2020-09-15 14:49:23 +01:00

parent 884c407412

commit 4ff64bcfe2

2 changed files with 32 additions and 6 deletions

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35

drivers/gpu/drm/i915/gt/intel_lrc.c

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3

drivers/gpu/drm/i915/gt/intel_lrc_reg.h

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