linux-kernel - Re: [PATCH v3 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver

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Date:   Mon, 8 Apr 2019 06:17:18 +0000
From:   Mickael GUENE <mickael.guene@...com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
CC:     "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "Hugues FRUCHET" <hugues.fruchet@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
        Petr Cvek <petrcvekcz@...il.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Ben Kao" <ben.kao@...el.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "Todor Tomov" <todor.tomov@...aro.org>,
        Rui Miguel Silva <rui.silva@...aro.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Ricardo Ribalda Delgado <ricardo@...alda.com>,
        "Jacopo Mondi" <jacopo+renesas@...ndi.org>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Bingbu Cao <bingbu.cao@...el.com>
Subject: Re: [PATCH v3 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge
 driver

Hi Sakari,

On 4/6/19 13:01, Sakari Ailus wrote:
> On Tue, Mar 26, 2019 at 02:36:41PM +0000, Mickael GUENE wrote:
>> Sakari,
>>
>>>> +static int bpp_from_code(__u32 code)
>>>> +{
>>>> +	switch (code) {
>>>> +	case MEDIA_BUS_FMT_SBGGR8_1X8:
>>>> +	case MEDIA_BUS_FMT_SGBRG8_1X8:
>>>> +	case MEDIA_BUS_FMT_SGRBG8_1X8:
>>>> +	case MEDIA_BUS_FMT_SRGGB8_1X8:
>>>> +		return 8;
>>>> +	case MEDIA_BUS_FMT_SBGGR10_1X10:
>>>> +	case MEDIA_BUS_FMT_SGBRG10_1X10:
>>>> +	case MEDIA_BUS_FMT_SGRBG10_1X10:
>>>> +	case MEDIA_BUS_FMT_SRGGB10_1X10:
>>>> +		return 10;
>>>> +	case MEDIA_BUS_FMT_SBGGR12_1X12:
>>>> +	case MEDIA_BUS_FMT_SGBRG12_1X12:
>>>> +	case MEDIA_BUS_FMT_SGRBG12_1X12:
>>>> +	case MEDIA_BUS_FMT_SRGGB12_1X12:
>>>> +		return 12;
>>>> +	case MEDIA_BUS_FMT_UYVY8_2X8:
>>>
>>> This is good for the parallel bus, but on CSI-2 side you should have
>>> MEDIA_BUS_FMT_UYVY8_1X16 instead. This isn't technically correct for a
>>> serial bus, but the custom is to use the one sample / pixel formats on the
>>> serial busses.
>>>
>>  Should MEDIA_BUS_FMT_BGR888_1X24 be something like
>> MEDIA_BUS_FMT_BGR888_3X8 for parallel output bus ?
> 
> Good point. Yes.
> 
> Could you add that format to
> Documentation/media/uapi/v4l/subdev-formats.rst, please, in a separate
> patch?
> 
 I also need to add it to include/uapi/linux/media-bus-format.h I
suppose ?
 I was also wondering if I should add MEDIA_BUS_FMT_BGR888_3X8_BE and
MEDIA_BUS_FMT_BGR888_3X8_LE instead ?

 So if you are ok with the above I will add MEDIA_BUS_FMT_BGR888_3X8 to
subdev-formats.rs and media-bus-format.h as a first parch of my serie.

Mickael