On Tue, Nov 11, 2014 at 04:13:09PM +0100, Daniel Vetter wrote:
> On Sat, Nov 08, 2014 at 08:25:04AM +0000, Chris Wilson wrote:
> > On Fri, Nov 07, 2014 at 02:25:38PM -0800, O'Rourke, Tom wrote:
> > > On Fri, Nov 07, 2014 at 10:41:26AM +0000, Chris Wilson wrote:
> > > > On Wed, Nov 05, 2014 at 05:31:34PM -0800, Tom.O'Rourke@xxxxxxxxx wrote:
> > > > > From: Tom O'Rourke <Tom.O'Rourke@xxxxxxxxx>
> > > > >
> > > > > Updated gen6|8_enable_rps() for Haswell and Broadwell
> > > > > to use the efficient frequency read from pcode.
> > > > >
> > > > > Added hsw_use_efficient_freq() to read efficient
> > > > > frequency (aka RPe) from pcode. The efficiency is
> > > > > based on the frequency/power ratio (MHz/W); this is
> > > > > considering GT power and not package power. The
> > > > > efficent frequency is the highest frequency for which
> > > > > the frequency/power ratio is within some threshold of
> > > > > the highest frequency/power ratio.
> > > > >
> > > > > Also set the min_freq_softlimit to the efficient
> > > > > frequency. A fixed decrease in frequency results in
> > > > > smaller decrease in power at frequencies less than RPe
> > > > > than at frequencies above RPe.
> > > > >
> > > > > Signed-off-by: Tom O'Rourke <Tom.O'Rourke@xxxxxxxxx>
> > > > > ---
> > > > > drivers/gpu/drm/i915/i915_reg.h | 1 +
> > > > > drivers/gpu/drm/i915/intel_pm.c | 22 ++++++++++++++++++++++
> > > > > 2 files changed, 23 insertions(+)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > > > index d43fa0e..6fbfdec 100644
> > > > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > > > @@ -6010,6 +6010,7 @@ enum punit_power_well {
> > > > > #define GEN6_ENCODE_RC6_VID(mv) (((mv) - 245) / 5)
> > > > > #define GEN6_DECODE_RC6_VID(vids) (((vids) * 5) + 245)
> > > > > #define DISPLAY_IPS_CONTROL 0x19
> > > > > +#define HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL 0x1A
> > > > > #define GEN6_PCODE_DATA 0x138128
> > > > > #define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8
> > > > > #define GEN6_PCODE_FREQ_RING_RATIO_SHIFT 16
> > > > > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> > > > > index 300d7e5..e4347d9 100644
> > > > > --- a/drivers/gpu/drm/i915/intel_pm.c
> > > > > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > > > > @@ -4706,6 +4706,18 @@ static void parse_rp_state_cap(struct drm_i915_private *dev_priv, u32 rp_state_c
> > > > > dev_priv->rps.min_freq_softlimit = dev_priv->rps.min_freq;
> > > > > }
> > > > >
> > > > > +static void hsw_use_efficient_freq(struct drm_i915_private *dev_priv)
> > > >
> > > > use_efficient_freq() ?
> > > >
> > > > Shouldn't this be:
> > > >
> > > > parse_rp_state_cap()
> > > > {
> > > > ...
> > > > dev_priv->rps.efficient_freq = rps_rpe_freq(dev_priv);
> > > > ...
> > > > }
> > > >
> > > The parse_rp_state_cap() function is for parsing the
> > > RP_STATE_CAP register. The pcode read to get the
> > > efficient frequency seems out of scope.
> >
> > Rename it then. The function that sets rpe seems to be the ideal point
> > to set rpe...
>
> Well reading the rpe value seems to be platforms specific. I think
> updating the comment as I've suggested is good enough, even when not
> really pretty.
So why not add it to piece of platform specific code we already had for
the rpe value?
Besides which the point that use_efficient_freq() is a poor function
name seems to have fallen by the wayside.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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