linux-kernel - Re: [PATCH v2 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver

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Message-ID: <231c710f-5a16-29bb-020c-644d88063f53@st.com>
Date:   Tue, 26 Mar 2019 12:32:11 +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>,
        Arnd Bergmann <arnd@...db.de>,
        Matt Ranostay <matt.ranostay@...sulko.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 v2 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge
 driver

Hi Sakari,

On 3/26/19 12:34, Sakari Ailus wrote:
> Hi Mickael,
> 
> On Mon, Mar 25, 2019 at 12:22:17PM +0000, Mickael GUENE wrote:
> ...
>>>> +	/* register it for later use */
>>>> +	bridge->rx = ep;
>>>> +	bridge->rx.link_frequencies = ep.nr_of_link_frequencies == 1 ?
>>>> +		&bridge->link_frequency : NULL;
>>>
>>> I think you need to simply ignore the link frequencies here. The
>>> transmitting device can tell the frequency based on its configuration
>>> (based on the link frequencies). You seem to have implemented that already.
>>>
>>  Idea of this was to allow some support for sensor that doesn't implement
>> V4L2_CID_PIXEL_RATE. Do you think it's useless ?
> 
> Sensor drivers need to be amended with support for that control.
> 
 Ok. I will drop mipid02_get_link_freq_from_rx_ep and mipid02_get_link_freq_from_cid_link_freq
and only use V4L2_CID_PIXEL_RATE to compute link speed.