linux-kernel - Re: [PATCH v3 09/25] media: i2c: imx258: Add support for running on 2 CSI data lanes

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Date: Fri, 5 Apr 2024 23:25:41 -0600
From: Luis Garcia <git@...gi311.com>
To: Pavel Machek <pavel@....cz>
Cc: linux-media@...r.kernel.org, dave.stevenson@...pberrypi.com,
 jacopo.mondi@...asonboard.com, mchehab@...nel.org, robh@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, shawnguo@...nel.org,
 s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
 sakari.ailus@...ux.intel.com, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org
Subject: Re: [PATCH v3 09/25] media: i2c: imx258: Add support for running on 2
 CSI data lanes

On 4/3/24 12:45, Pavel Machek wrote:
> Hi!
> 
>> +/*
>> + * 4208x3120 @ 30 fps needs 1267Mbps/lane, 4 lanes.
>> + * To avoid further computation of clock settings, adopt the same per
>> + * lane data rate when using 2 lanes, thus allowing a maximum of 15fps.
>> + */
>> +static const struct imx258_reg mipi_1267mbps_19_2mhz_2l[] = {
>> +	{ 0x0136, 0x13 },
>> +	{ 0x0137, 0x33 },
>> +	{ 0x0301, 0x0A },
>> +	{ 0x0303, 0x02 },
>> +	{ 0x0305, 0x03 },
>> +	{ 0x0306, 0x00 },
>> +	{ 0x0307, 0xC6 },
>> +	{ 0x0309, 0x0A },
>> +	{ 0x030B, 0x01 },
>> +	{ 0x030D, 0x02 },
>> +	{ 0x030E, 0x00 },
>> +	{ 0x030F, 0xD8 },
>> +	{ 0x0310, 0x00 },
>> +
>> +	{ 0x0114, 0x01 },
>> +	{ 0x0820, 0x09 },
>> +	{ 0x0821, 0xa6 },
>> +	{ 0x0822, 0x66 },
>> +	{ 0x0823, 0x66 },
>> +};
>> +
>> +static const struct imx258_reg mipi_1267mbps_19_2mhz_4l[] = {
>>  	{ 0x0136, 0x13 },
>>  	{ 0x0137, 0x33 },
>>  	{ 0x0301, 0x05 },
> 
> I wish we did not have to copy all the magic values like this.
> 
> Best regards,
> 								Pavel
> 								

no kidding, magic values everywhere.... it makes it annoying
for me to move things around because they all start to look
similar. Down the line we added in more defined names so its
not as bad but still its bad lol.