linux-kernel - Re: [PATCH 1/3] media: atmel-isc: Not support RBG format from sensor.

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Date:   Tue, 22 Aug 2017 09:18:17 +0800
From:   "Yang, Wenyou" <Wenyou.Yang@...rochip.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>
CC:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        <linux-kernel@...r.kernel.org>, Sakari Ailus <sakari.ailus@....fi>,
        Jonathan Corbet <corbet@....net>,
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: [PATCH 1/3] media: atmel-isc: Not support RBG format from sensor.

Hi Hans,

On 2017/8/21 22:07, Hans Verkuil wrote:
> On 08/17/2017 09:16 AM, Wenyou Yang wrote:
>> The 12-bit parallel interface supports the Raw Bayer, YCbCr,
>> Monochrome and JPEG Compressed pixel formats from the external
>> sensor, not support RBG pixel format.
>>
>> Signed-off-by: Wenyou Yang <wenyou.yang@...rochip.com>
>> ---
>>
>>   drivers/media/platform/atmel/atmel-isc.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
>> index d4df3d4ccd85..535bb03783fe 100644
>> --- a/drivers/media/platform/atmel/atmel-isc.c
>> +++ b/drivers/media/platform/atmel/atmel-isc.c
>> @@ -1478,6 +1478,11 @@ static int isc_formats_init(struct isc_device *isc)
>>   	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
>>   	       NULL, &mbus_code)) {
>>   		mbus_code.index++;
>> +
>> +		/* Not support the RGB pixel formats from sensor */
>> +		if ((mbus_code.code & 0xf000) == 0x1000)
>> +			continue;
> Am I missing something? Here you skip any RGB mediabus formats, but in patch 3/3
> you add RGB mediabus formats. But this patch prevents those new formats from being
> selected, right?
This patch prevents getting the RGB format from the sensor directly.
The RGB format can be produced by ISC controller by itself.

> Regards,
>
> 	Hans
>
>> +
>>   		fmt = find_format_by_code(mbus_code.code, &i);
>>   		if (!fmt)
>>   			continue;
>>

Best Regards,
Wenyou Yang