linux-kernel - Re: [PATCH] drm/msm/dp: Shorten SETUP timeout

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Message-ID: <CAE-0n53FC7JCCJoye_uKeqaLKrZeHXLtvObxWFedaUzjirmBaA@mail.gmail.com>
Date:   Tue, 5 Oct 2021 15:36:43 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Abhinav Kumar <abhinavk@...eaurora.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Sankeerth Billakanti <sbillaka@...eaurora.org>
Subject: Re: [PATCH] drm/msm/dp: Shorten SETUP timeout

Quoting Bjorn Andersson (2021-10-05 14:40:38)
> On Tue 05 Oct 11:45 PDT 2021, Stephen Boyd wrote:
>
> > Quoting Bjorn Andersson (2021-10-04 19:37:50)
> > > Found in the middle of a patch from Sankeerth was the reduction of the
> > > INIT_SETUP timeout from 10s to 100ms. Upon INIT_SETUP timeout the host
> > > is initalized and HPD interrupt start to be serviced, so in the case of
> > > eDP this reduction improves the user experience dramatically - i.e.
> > > removes 9.9s of bland screen time at boot.
> > >
> > > Suggested-by: Sankeerth Billakanti <sbillaka@...eaurora.org>
> > > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > > ---
> >
> > Any Fixes tag? BTW, the delay design is pretty convoluted. I had to go
> > re-read the code a couple times to understand that it's waiting 100ms
> > times the 'delay' number. Whaaaaat?
> >
>
> I assume you're happy with the current 10s delay on the current
> devices, so I don't think we should push for this to be backported.
> I have no need for it to be backported on my side at least.
>

Sure. Fixes tag != backported to stable trees but it is close.

> > Reviewed-by: Stephen Boyd <swboyd@...omium.org>
>