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Subject: Re: [PATCH v8 08/10] gpu: host1x: mipi: Keep MIPI clock enabled till
 calibration is done
To:     Dmitry Osipenko <digetx@gmail.com>,
        Thierry Reding <thierry.reding@gmail.com>
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From:   Sowjanya Komatineni <skomatineni@nvidia.com>
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On 8/6/20 11:01 AM, Dmitry Osipenko wrote:
> 06.08.2020 20:52, Sowjanya Komatineni =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
> ...
>> Right mutex_unlock should happen at end of finish_calibration.
>>
>> With keeping mutex locked in start, we dont have to check for active to
>> be 0 to issue start as mutex will keep it locked and other pads
>> calibration can only go thru when current one is done.
>>
>> So instead of below sequence, its simpler to do this way?
>>
>> start_calibration()
>>
>> - mutex_lock
>>
>> - wait for 72uS after start
>>
>> finish_calibration()
>>
>> - keep check for ACTIVE =3D 0 and DONE =3D 1
> I think only the DONE bits which correspond to the mipi_device->pads
> bitmask should be awaited.

As next START can't be triggered when auto cal is ACTIVE, we should keep=20
this in finish.

As we do mutex_unlock only at end of finish, other pads calibrations=20
dont go thru till the one in process is finished.

So in this case ACTIVE applies to current selected pads that are under=20
calibration.

>
>> - mutex_unlock()
> Perhaps the start_calibration() also needs to be changed to not touch
> the MIPI_CAL_CONFIG bits of the unrelated pads?
Driver already takes care of programming corresponding pads config only.
>
> Otherwise sounds good to me.