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

[Pandiyan, Dhinakaran]

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?

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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