linux-kernel - Re: [RFC PATCH v5 13/14] media: tegra-video: Add CSI MIPI pads calibration

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Message-ID: <f5440f57-3653-7cf0-9efe-e9a0c276f7cf@nvidia.com>
Date:   Wed, 29 Jul 2020 17:55:48 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <frankc@...dia.com>, <hverkuil@...all.nl>,
        <sakari.ailus@....fi>, <robh+dt@...nel.org>,
        <helen.koike@...labora.com>
CC:     <sboyd@...nel.org>, <gregkh@...uxfoundation.org>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-i2c@...r.kernel.org>
Subject: Re: [RFC PATCH v5 13/14] media: tegra-video: Add CSI MIPI pads
 calibration


On 7/29/20 5:52 PM, Sowjanya Komatineni wrote:
>
> On 7/29/20 5:43 PM, Dmitry Osipenko wrote:
>> 30.07.2020 03:27, Sowjanya Komatineni пишет:
>> ...
>>>>> Secondly, perhaps a failed calibration isn't a very critical error?
>>>>> Hence just printing a warning message should be enough.
>>>> Using dev_err to report calibration failure. Are you suggesting to use
>>>> dev_warn instead of dev_err?
>> I meant that failing s_stream might be unnecessary.
>>
>> The dev_warn should be more appropriate for a non-critical errors.
>>
>>>>> Could you please make a patch that factors all ON/OFF code paths 
>>>>> into a
>>>>> separate functions? It's a bit difficult to follow the combined code,
>>>>> especially partial changes in the patches. Thanks in advance!
>>>> what do you mean by partial changes in patches?
>>>>
>>>> Can you please be more clear?
>>> Also please specify what ON/OFF code paths you are referring to when 
>>> you
>>> say to move into separate functions?
>> I meant to change all the code like this:
>>
>> set(on) {
>>      if (on) {
>>         ...
>>         return;
>>      }
>>
>>      if (!on)
>>        ...
>>
>>      return;
>> }
>>
>> to somewhat like this:
>>
>> set(on) {
>>      if (on)
>>        ret = enable();
>>      else
>>        ret = disable();
>>
>>      return ret;
>> }
>
> You mean to change tegra_channel_set_stream() ?
changing tegra_channel_set_stream() to have like below will have 
redundant calls as most of the code b/w enable and disable is same 
except calling them in reverse order based on on/off and doing MIPI 
calibration only during ON


if (on)
     ret = enable()
else
     ret = disable()
return ret;

>
>