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

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Message-ID: <268dd631-bf5e-8236-1e38-786989cc06ac@nvidia.com>
Date:   Thu, 6 Aug 2020 09:43:58 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.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


On 8/6/20 9:42 AM, Sowjanya Komatineni wrote:
>
> On 8/6/20 9:37 AM, Dmitry Osipenko wrote:
>> 06.08.2020 19:13, Dmitry Osipenko пишет:
>>> 06.08.2020 18:59, Sowjanya Komatineni пишет:
>>> ..
>>>> We cant use active status check for specific pads under calibration.
>>>> This is common bit for all pads.
>>> I'm not sure why this is a problem.
>>>
>> IIUC, the start_calibration() should wait for the MIPI_CAL_STATUS_ACTIVE
>> and finish_calibration() should wait for MIPI_AUTO_CAL_DONE_CSIA/B.
>
> As soon as START bit it set, FSM will set ACTIVE = 1
>
> There is no added advantage of waiting for ACTIVE to be in 
> start_calibration()
Also like I explained in other post of same discussion, ACTIVE we will 
be 1 even when other parallel pads are under calibration.