[Intel-gfx] [PATCH 1/4] drm/i915: Drop stray clearing of rps->last_adj

[Chris Wilson]

Quoting Mika Kuoppala (2018-08-02 16:30:24)
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> 
> > We used to reset last_adj to 0 on crossing a power domain boundary, to
> > slow down our rate of change. However, commit 60548c554be2 ("drm/i915:
> > Interactive RPS mode") accidentally caused it to be reset on every
> > frequency update, nerfing the fast response granted by the slow start
> > algorithm.
> >
> > Fixes: 60548c554be2 ("drm/i915: Interactive RPS mode")
> > Testcase: igt/pm_rps/mix-max-config-loaded
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> 
> Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

Plonked this one as fixes the regression. 2&3 are nice cleanups, 4 seems
like an unlikely boundary case, but I suspect kodi might be a good
example.
-Chris