On Thu, Jun 16, 2016 at 12:15:05PM +0300, Mika Kuoppala wrote:
> Chris Wilson <ch...@chris-wilson.co.uk> writes:
>
> > Select idle frequency during initialisation, then reset the last known
> > frequency when re-enabling. This allows us to preserve the user selected
> > frequency across resets.
> >
> > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> > Cc: ville Syrjälä <ville.syrj...@linux.intel.com>
> > ---
> > drivers/gpu/drm/i915/intel_pm.c | 34 +++++++++++++++++-----------------
> > 1 file changed, 17 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_pm.c
> > b/drivers/gpu/drm/i915/intel_pm.c
> > index 658a75659657..98f0afa08332 100644
> > --- a/drivers/gpu/drm/i915/intel_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > @@ -5092,6 +5092,7 @@ static void gen6_init_rps_frequencies(struct
> > drm_i915_private *dev_priv)
> > }
> >
> > dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
> > + dev_priv->rps.cur_freq = dev_priv->rps.idle_freq;
> >
> > /* Preserve min/max settings in case of re-init */
> > if (dev_priv->rps.max_freq_softlimit == 0)
> > @@ -5108,6 +5109,15 @@ static void gen6_init_rps_frequencies(struct
> > drm_i915_private *dev_priv)
> > }
> > }
> >
> > +static void reset_rps(struct drm_i915_private *dev_priv,
> > + void (*set)(struct drm_i915_private *, u8))
> > +{
> > + u8 freq = dev_priv->rps.cur_freq; /* force a reset */
> > + dev_priv->rps.power = -1;
>
> I didn't find a spot where rps.power == -1 would cause
> a reset.
>
> For me it seems that gen6_init_rps_frequencies only handles
> the enums thus with -1 we never will update the rps.power.
Which enum has the value of -1?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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