On Fri, 2014-06-06 at 19:19 +0200, Daniel Vetter wrote:
> On Thu, Jun 05, 2014 at 08:31:47PM +0300, Imre Deak wrote:
> > Jesse noticed that the punit communication needed to query the VLV power
> > well status can cause substantial delays. Since we can query the state
> > frequently, for example during I2C transfers, maintain a cached version
> > of the HW state to get rid of this delay.
> >
> > This fixes at least one reported regression where boot time increased by
> > ~4 seconds due to frequent power well state queries on VLV during eDP
> > EDID read.
> >
> > Reported-by: Jesse Barnes <jesse.barnes@xxxxxxxxx>
> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
>
> A citation for the regressing commit here (i.e. the one that enabled vlv
> runtime pm) would be good so that Jani can pick it up.
I'm not aware of any other case where we had a significant overhead, so
for the above particular issue I'd say
this was introduced by
commit bb4932c4f17b68f34645ffbcf845e4c29d17290b
Author: Imre Deak <imre.deak@xxxxxxxxx>
Date: Mon Apr 14 20:24:33 2014 +0300
drm/i915: vlv: check port power domain instead of only D0 for eDP
VDD on
> Aside: intel_rpm.c with the runtime pm infrastructure + some overview
> kerneldoc would be really, really nice.
You mean to move out the power well and rpm stuff to this new file?
Agreed, intel_pm.c is rather big already.
--Imre
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