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 <ch...@chris-wilson.co.uk> Cc: Andi Shyti <andi.sh...@intel.com> Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com> Cc: Imre Deak <imre.d...@intel.com> --- drivers/gpu/drm/i915/gt/intel_rc6.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c index 4dc82196b285..8ec2b7725141 100644 --- a/drivers/gpu/drm/i915/gt/intel_rc6.c +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c @@ -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); -- 2.24.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
