drm/i915: Trust programmed MCR in read_subslice_reg

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Instead of re-calculating the MCR selector in read_subslice_reg do the
rwm on its existing value and restore it when done.

This consolidates MCR programming to one place for cnl+, and avoids
re-calculating its default value on older platforms during hangcheck.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190717180624.20354-3-tvrtko.ursulin@linux.intel.com

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This commit is contained in:

Tvrtko Ursulin 2019-07-17 19:06:20 +01:00

parent 15160879d4

commit 7405cb77e0

1 changed files with 12 additions and 25 deletions

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37

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

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