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drm/i915/gt: Disable manual rc6 for Braswell/Baytrail

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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: 730eaeb524 ("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
This commit is contained in:
Chris Wilson 2019-12-10 18:01:11 +00:00
parent 220a9d45c6
commit 972745fd57
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/gt/intel_rc6.c
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@ -612,6 +612,9 @@ void intel_rc6_park(struct intel_rc6 *rc6)
return;
}
if (!(rc6->ctl_enable & GEN6_RC_CTL_RC6_ENABLE))
return;
/* Turn off the HW timers and go directly to rc6 */
set(uncore, GEN6_RC_CONTROL, GEN6_RC_CTL_RC6_ENABLE);
set(uncore, GEN6_RC_STATE, 0x4 << RC_SW_TARGET_STATE_SHIFT);