linux-kernel - Re: [PATCH v8 08/10] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done

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Message-ID: <04413bc8-8d89-7e57-9b34-84bb11ecb008@gmail.com>
Date:   Thu, 6 Aug 2020 19:45:33 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     jonathanh@...dia.com, frankc@...dia.com, hverkuil@...all.nl,
        sakari.ailus@....fi, robh+dt@...nel.org, helen.koike@...labora.com,
        gregkh@...uxfoundation.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 08/10] gpu: host1x: mipi: Keep MIPI clock enabled till
 calibration is done

06.08.2020 19:41, Sowjanya Komatineni пишет:
...
>> What about to add 72us delay to the end of start_calibration() in order
>> to ensure that FSM is finished before LP-11?
> 
> Why we should add 72uS in start_calibration() when can use same
> finish_calibration() for both pass/fail cases?
> 
> Only timing loose we see is in case of failure we still wait for 250ms
> and as this is failing case I hope should be ok.
> 

You said that calibration settings are applied to pads on LP-11, but if
LP-11 happens before FSM is finished, then what values will be applied
if any?