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drm/i915/gt: Disable manual rc6 for Braswell/Baytrail
authorChris Wilson <chris@chris-wilson.co.uk>
Tue, 10 Dec 2019 18:01:11 +0000 (18:01 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Wed, 11 Dec 2019 21:34:35 +0000 (21:34 +0000)
commit972745fd577044ea153ec6d7899dcf9bb3c806e5
tree81daffb9a6d9be2bfa2454093f77ef02aa12cf5e
parent220a9d45c6709127cd56430caef07034f1ec5030
drm/i915/gt: Disable manual rc6 for Braswell/Baytrail

The initial investigated showed that while the PCU on Braswell/Baytrail
controlled RC6 itself. setting the software RC6 request made no
difference. Further testing reveals though that it causes a delay in the
PCU on enabling RC6.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/763
Fixes: 730eaeb52426 ("drm/i915/gt: Manual rc6 entry upon parking")
Testcase: igt/perf/rc6-disable
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Acked-by: Andi Shyti <andi.shyti@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191210180111.3958558-1-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/gt/intel_rc6.c