On Mon, Oct 16, 2017 at 12:07:23PM +0000, David Weinehall wrote:
> On Tue, Aug 22, 2017 at 04:58:28PM -0700, Rodrigo Vivi wrote:
> > Apparently RC6 residency is lower than expected
> > with EI mode for most of the cases on CNL A0, B0 and C0.
> >
> > This Wa doesn't solve our lower residency, but I
> > believe it is better to have it since EI is not
> > expected to work by HW engineers anyways.
> >
> > Cc: David Weinehall <[email protected]>
> > Cc: Mika Kuoppala <[email protected]>
> > Signed-off-by: Rodrigo Vivi <[email protected]>
>
> Sorry, I totally missed out on this one earlier. Looks correct,
> and I've tested the patch on our CNL-Y without noticing any
> regressions.
>
> Reviewed-by: David Weinehall <[email protected]>
merged to dinq. Thanks.
>
> > ---
> > drivers/gpu/drm/i915/i915_drv.h | 1 +
> > drivers/gpu/drm/i915/intel_pm.c | 11 +++++++++--
> > 2 files changed, 10 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h
> > b/drivers/gpu/drm/i915/i915_drv.h
> > index 7587ef53026b..cb017b7d8ccb 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -2967,6 +2967,7 @@ intel_info(const struct drm_i915_private *dev_priv)
> >
> > #define CNL_REVID_A0 0x0
> > #define CNL_REVID_B0 0x1
> > +#define CNL_REVID_C0 0x2
> >
> > #define IS_CNL_REVID(p, since, until) \
> > (IS_CANNONLAKE(p) && IS_REVID(p, since, until))
> > diff --git a/drivers/gpu/drm/i915/intel_pm.c
> > b/drivers/gpu/drm/i915/intel_pm.c
> > index d5ff0b9f999f..8c6d74d94799 100644
> > --- a/drivers/gpu/drm/i915/intel_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > @@ -6456,7 +6456,7 @@ static void gen9_enable_rc6(struct drm_i915_private
> > *dev_priv)
> > {
> > struct intel_engine_cs *engine;
> > enum intel_engine_id id;
> > - uint32_t rc6_mask = 0;
> > + u32 rc6_mode, rc6_mask = 0;
> >
> > /* 1a: Software RC state - RC0 */
> > I915_WRITE(GEN6_RC_STATE, 0);
> > @@ -6494,8 +6494,15 @@ static void gen9_enable_rc6(struct drm_i915_private
> > *dev_priv)
> > rc6_mask = GEN6_RC_CTL_RC6_ENABLE;
> > DRM_INFO("RC6 %s\n", onoff(rc6_mask & GEN6_RC_CTL_RC6_ENABLE));
> > I915_WRITE(GEN6_RC6_THRESHOLD, 37500); /* 37.5/125ms per EI */
> > +
> > + /* WaRsUseTimeoutMode:cnl (pre-prod) */
> > + if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_C0))
> > + rc6_mode = GEN7_RC_CTL_TO_MODE;
> > + else
> > + rc6_mode = GEN6_RC_CTL_EI_MODE(1);
> > +
> > I915_WRITE(GEN6_RC_CONTROL,
> > - GEN6_RC_CTL_HW_ENABLE | GEN6_RC_CTL_EI_MODE(1) | rc6_mask);
> > + GEN6_RC_CTL_HW_ENABLE | rc6_mode | rc6_mask);
> >
> > /*
> > * 3b: Enable Coarse Power Gating only when RC6 is enabled.
> > --
> > 2.13.2
> >
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