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

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Date:   Tue, 7 Feb 2023 17:24:30 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Polimera <vpolimer@....qualcomm.com>,
        "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

On 07/02/2023 16:28, Vinod Polimera wrote:
> 
> 
>> -----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

Can we please get rid of this somehow?

>>   
>> 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?

Ack.

-- 
With best wishes
Dmitry