[Intel-gfx] [PATCH 0/3] PSR lag fixes

[Rodrigo Vivi]

On Wed, Mar 14, 2018 at 04:35:55PM -0700, Pandiyan, Dhinakaran wrote:
> 
> 
> 
> On Wed, 2018-03-14 at 23:09 +0100, Hans de Goede wrote:
> > Hi,
> > 
> > On 14-03-18 21:49, Pandiyan, Dhinakaran wrote:
> > > 
> > > On Wed, 2018-02-14 at 09:25 +0100, Hans de Goede wrote:
> > >> Hi,
> > >>
> > >> On 12-02-18 18:42, Pandiyan, Dhinakaran wrote:
> > >>> On Mon, 2018-02-12 at 09:45 +0100, Hans de Goede wrote:
> > >>>> Hi,
> > >>>>
> > >>>> On 12-02-18 07:08, Dhinakaran Pandiyan wrote:
> > >>>>> PSR currently when enabled results in semi-permanent freezes or noticeable
> > >>>>> cursor lags.
> > >>>>>
> > >>>>> https://patchwork.freedesktop.org/series/37598/ will fix long freezes due
> > >>>>> to frame counter resets.
> > >>>>>
> > >>>>> This series has three more fixes -
> > >>>>> Patch 1 eliminates PSR exit for flips and makes us rely on the HW to do it.
> > >>>>> Patch 2 fixes cusor move lag by relying on HW to exit PSR.
> > >>>>> Patch 3 fixes temporary freeze seen with fbdev.
> > >>>>>
> > >>>>> With both the series applied, PSR on my SKL ThinkPad feels pretty good.
> > >>>>
> > >>>> Thank you for your great work on this.
> > >>>>
> > >>>> Are there any more PSR fixes in the pipeline?
> > >>>
> > >>> Yeah, there are a few more fixes that I hope will appear on the list in
> > >>> the next two weeks or so.
> > >>
> > >> Ok, can you send a mail when you're done (in sofar any software is ever
> > >> "done") and you would like me to ask all people who have been kind enough
> > >> to test PSR to retest ?
> > >>
> > > 
> > > Hi Hans,
> > > 
> > > Thanks for your patience and help. I believe the current drm-tip is in a
> > > decent shape to retest PSR. Booting with i915.enable_psr = 1 is still
> > > needed. The fixes have been mostly developed/tested on gen-9 hardware
> > > but they apply to other platforms too.
> > 
> > Cool, thank you. Current drm-tip will all be merged into 4.17-rc1, right?

Unfortunately no. All changes current in dinq and not on drm-intel-next are only
going to 4.18-rc1.

> 
> Rodrigo,
> 
> Can you help me answer that?
> 
> 
> > 
> > Then I think I will just wait for that, most distros already provide rc builds
> > for testing, so that way it will be easy for people to test.
> > 
> > Regards,
> > 
> > Hans
> > 
> > 
> > 
> > 
> > > 
> > > -DK
> > > 
> > >>>> If not I think I should do
> > >>>> a custom Fedora kernel build based on 4.15 + recent fixes and ask all my
> > >>>> testers to retest with that.
> > >>>>
> > >>>> I do have some questions before I do this:
> > >>>>
> > >>>> 1) I believe that only testers with skylake (normal or LP) or newer should
> > >>>> re-test, correct?
> > >>>
> > >>> These fixes do apply for HSW/BDW, so essentially all the big cores
> > >>> supporting PSR. But, HSW/BDW need fixes for AUX channel-PSR interaction
> > >>> also. I haven't looked into CHV/VLV.
> > >>>
> > >>>>
> > >>>> 2) I know there are 2 series (including this one), can someone provide a link
> > >>>> to the latest patchwork version of those 2 series, or even better a git
> > >>>> branch with 4.15 + those patches? Any patches I'm missing if I pick up these
> > >>>> 2 series?
> > >>>
> > >>> https://patchwork.freedesktop.org/series/37598/
> > >>> https://patchwork.freedesktop.org/series/38067/
> > >>>
> > >>>
> > >>>> 3) I'm thinking 4.15 atm, but I could also do a 4.16-rc1 test kernel instead
> > >>>> if that would be better, would that be better ?
> > >>>
> > >>> I can't think of any diff that would affect PSR, but the latest is
> > >>> better I suppose.
> > >>
> > >> Ok.
> > >>
> > >> Regards,
> > >>
> > >> Hans
> > >> _______________________________________________
> > >> Intel-gfx mailing list
> > >> Intel-gfx at lists.freedesktop.org
> > >> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > _______________________________________________
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