linux-kernel - RE: [PATCH v12 09/14] drm/msm/dp: disable self_refresh

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Date:   Tue, 7 Feb 2023 14:28:13 +0000
From:   Vinod Polimera <vpolimer@....qualcomm.com>
To:     "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        "Vinod Polimera (QUIC)" <quic_vpolimer@...cinc.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robdclark@...il.com" <robdclark@...il.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        "swboyd@...omium.org" <swboyd@...omium.org>,
        "Kalyan Thota (QUIC)" <quic_kalyant@...cinc.com>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        "Vishnuvardhan Prodduturi (QUIC)" <quic_vproddut@...cinc.com>,
        "Bjorn Andersson (QUIC)" <quic_bjorande@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>
Subject: RE: [PATCH v12 09/14] drm/msm/dp: disable self_refresh_aware after
 entering psr



> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Sent: Tuesday, January 31, 2023 6:19 PM
> To: Vinod Polimera (QUIC) <quic_vpolimer@...cinc.com>; dri-
> devel@...ts.freedesktop.org; linux-arm-msm@...r.kernel.org;
> freedreno@...ts.freedesktop.org; devicetree@...r.kernel.org
> Cc: Sankeerth Billakanti (QUIC) <quic_sbillaka@...cinc.com>; linux-
> kernel@...r.kernel.org; robdclark@...il.com; dianders@...omium.org;
> swboyd@...omium.org; Kalyan Thota (QUIC) <quic_kalyant@...cinc.com>;
> Kuogee Hsieh (QUIC) <quic_khsieh@...cinc.com>; Vishnuvardhan
> Prodduturi (QUIC) <quic_vproddut@...cinc.com>; Bjorn Andersson (QUIC)
> <quic_bjorande@...cinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@...cinc.com>
> Subject: Re: [PATCH v12 09/14] drm/msm/dp: disable self_refresh_aware
> after entering psr
>  
> On 30/01/2023 17:11, Vinod Polimera wrote:
> > From: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> >
> > Updated frames get queued if self_refresh_aware is set when the
> > sink is in psr. To support bridge enable and avoid queuing of update
> > frames, reset the self_refresh_aware state after entering psr.
> >
> > Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> > Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> > ---
> >   drivers/gpu/drm/msm/dp/dp_drm.c | 25 ++++++++++++++++++++++++-
> >   1 file changed, 24 insertions(+), 1 deletion(-)
> 
> As I stated in v11's discussion, I do not like the way this change plays
> with the self_refresh_aware. Please find another way to work around the
> timing issue (let's probably continue the discussion back in v11).
> 
Currently we are not able to reproduce the issue with KASAN enabled and minimum cpu frequency builds.
We can revisit this patch if it is reproduced in future. Meanwhile I think on handling it in a different way.
Can we not consider this patch for current merge?

> --
> With best wishes
> Dmitry

Thanks,
Vinod P.