linux-kernel - Re: [PATCH v6 2/4] media: stm32-dcmi: trace the supported fourcc/mbus

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Date:   Mon, 19 Aug 2019 07:23:17 +0000
From:   Hugues FRUCHET <hugues.fruchet@...com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
CC:     Alexandre TORGUE <alexandre.torgue@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Yannick FERTRE <yannick.fertre@...com>,
        Philippe CORNU <philippe.cornu@...com>,
        Mickael GUENE <mickael.guene@...com>
Subject: Re: [PATCH v6 2/4] media: stm32-dcmi: trace the supported
 fourcc/mbus_code

Hi Sakari,

On 8/16/19 10:15 AM, Sakari Ailus wrote:
> Hi Hugues,
> 
> On Wed, Aug 14, 2019 at 03:48:51PM +0200, Hugues Fruchet wrote:
>> Add a trace of the set of supported fourcc/mbus_code which
>> intersect between DCMI and source sub-device.
>>
>> Signed-off-by: Hugues Fruchet <hugues.fruchet@...com>
>> ---
>>   drivers/media/platform/stm32/stm32-dcmi.c | 12 ++++++++++--
>>   1 file changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
>> index b462f71..18acecf 100644
>> --- a/drivers/media/platform/stm32/stm32-dcmi.c
>> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
>> @@ -1447,12 +1447,20 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi)
>>   			/* Code supported, have we got this fourcc yet? */
>>   			for (j = 0; j < num_fmts; j++)
>>   				if (sd_fmts[j]->fourcc ==
>> -						dcmi_formats[i].fourcc)
>> +						dcmi_formats[i].fourcc) {
>>   					/* Already available */
>> +					dev_dbg(dcmi->dev, "Skipping fourcc/code: %4.4s/0x%x\n",
>> +						(char *)&sd_fmts[j]->fourcc,
>> +						mbus_code.code);
>>   					break;
>> -			if (j == num_fmts)
>> +				}
>> +			if (j == num_fmts) {
>>   				/* New */
>>   				sd_fmts[num_fmts++] = dcmi_formats + i;
>> +				dev_dbg(dcmi->dev, "Supported fourcc/code: %4.4s/0x%x\n",
> 
> Over 80 characters per line.
> 

This an exception of the "80 chars" in order to be able to grep in 
kernel messages:
https://www.kernel.org/doc/html/v4.10/process/coding-style.html
"However, never break user-visible strings such as printk messages, 
because that breaks the ability to grep for them."

This exception is managed in checkpatch.pl (--strict).

>> +					(char *)&sd_fmts[num_fmts - 1]->fourcc,
>> +					sd_fmts[num_fmts - 1]->mbus_code);
>> +			}
>>   		}
>>   		mbus_code.index++;
>>   	}
> 

BR,
Hugues.