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

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Date:   Tue, 26 Mar 2019 14:36:41 +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

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 ?

Rgs
Mickael