From: Mickael GUENE <mickael.guene@st.com>
To: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: "linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
"Hugues FRUCHET" <hugues.fruchet@st.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Matt Ranostay <matt.ranostay@konsulko.com>,
Petr Cvek <petrcvekcz@gmail.com>,
Akinobu Mita <akinobu.mita@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Ben Kao" <ben.kao@intel.com>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
"Todor Tomov" <todor.tomov@linaro.org>,
Rui Miguel Silva <rui.silva@linaro.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
Hans Verkuil <hverkuil@xs4all.nl>,
Ricardo Ribalda Delgado <ricardo@ribalda.com>,
"Jacopo Mondi" <jacopo+renesas@jmondi.org>,
Tianshu Qiu <tian.shu.qiu@intel.com>,
Bingbu Cao <bingbu.cao@intel.com>
Subject: Re: [PATCH v3 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver
Date: Tue, 26 Mar 2019 14:12:52 +0000 [thread overview]
Message-ID: <23f2f17c-7c3d-30c0-d191-1a5c7a4a2989@st.com> (raw)
In-Reply-To: <20190326135439.oju2k6idndjaulfj@paasikivi.fi.intel.com>
Sakari,
On 3/26/19 14:54, Sakari Ailus wrote:
> Hi Mickael,
>
> On Tue, Mar 26, 2019 at 12:57:03PM +0000, Mickael GUENE wrote:
> ...
>>>> +static int mipid02_set_fmt(struct v4l2_subdev *sd,
>>>> + struct v4l2_subdev_pad_config *cfg,
>>>> + struct v4l2_subdev_format *format)
>>>> +{
>>>> + struct v4l2_mbus_framefmt *mbus_fmt = &format->format;
>>>> + struct mipid02_dev *bridge = to_mipid02_dev(sd);
>>>> + struct i2c_client *client = bridge->i2c_client;
>>>> + struct v4l2_mbus_framefmt *fmt;
>>>> + int ret;
>>>> +
>>>> + dev_dbg(&client->dev, "%s for %d", __func__, format->pad);
>>>> +
>>>> + if (format->pad >= MIPID02_PAD_NB)
>>>> + return -EINVAL;
>>>> + /* second CSI-2 pad not yet supported */
>>>> + if (format->pad == 1)
>>>> + return -EINVAL;
>>>> +
>>>> + mutex_lock(&bridge->lock);
>>>> +
>>>> + if (bridge->streaming) {
>>>> + ret = -EBUSY;
>>>> + goto error;
>>>> + }
>>>> +
>>>> + if (format->which == V4L2_SUBDEV_FORMAT_TRY)
>>>> + fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
>>>> + else
>>>> + fmt = &bridge->fmt;
>>>> +
>>>> + *fmt = *mbus_fmt;
>>>
>>> What are the limits of the hardware regarding the size of the image? Aren't
>>> there any?
>>>
>> There are no limits for image size.
>>> The format on the sink pad needs to be propagated to the source pad as
>>> well. I presume there's nothing to set on the sink pad for this device, is
>>> there?
>> User only need to set format code so the driver can configure hardware.
>> In the mipid02 we have always the same format for sink and source. So I
>> only store one configuration during set_fmt when called from either pad0
>> (sink) or pad2 (source). Is it the correct way to implement it ? or
>> should I only accept set_fmt on pad0 ?
>> For get_fmt I return stored configuration for pad0 and pad2.
>
> Only 76 or so characters per line, please.
>
> For pad 0 (sink) the format must be settable freely (as you don't have any
> hardware restrictions) and on the pad 2 (source) the driver converts the
> format set on the pad 0 according to the hardware functionality. This is
> what the link validation from the source pad onwards is based on.
>
So for a set_fmt on pad 2 I return current configuration ? (as
in my case I have the same configuration for pad 0 and pad2)
And I only update format when set_fmt is called for pad 0 ?
Thanks for your help
Rgs
Mickael
next prev parent reply other threads:[~2019-03-26 14:13 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-12 6:44 [PATCH v1 0/3] Add support for MIPID02 CSI-2 to PARALLEL bridge I2C device Mickael Guene
2019-03-12 6:44 ` [PATCH v1 1/3] dt-bindings: Document MIPID02 bindings Mickael Guene
2019-03-16 21:46 ` Sakari Ailus
2019-03-18 8:28 ` Mickael GUENE
2019-03-18 8:48 ` Sakari Ailus
2019-03-18 9:08 ` Mickael GUENE
2019-03-12 6:44 ` [PATCH v1 2/3] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver Mickael Guene
2019-03-16 22:14 ` Sakari Ailus
2019-03-18 9:57 ` Mickael GUENE
2019-03-25 11:17 ` Sakari Ailus
2019-03-25 12:14 ` Mickael GUENE
2019-03-26 11:37 ` Sakari Ailus
2019-03-26 12:07 ` Mickael GUENE
2019-03-12 6:44 ` [PATCH v1 3/3] media: MAINTAINERS: add entry for STMicroelectronics MIPID02 media driver Mickael Guene
2019-03-16 21:47 ` Sakari Ailus
2019-03-18 10:01 ` Mickael GUENE
2019-03-25 7:55 ` [PATCH v2 0/2] Add support for MIPID02 CSI-2 to PARALLEL bridge I2C device Mickael Guene
2019-03-25 7:55 ` [PATCH v2 1/2] dt-bindings: Document MIPID02 bindings Mickael Guene
2019-03-25 7:55 ` [PATCH v2 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver Mickael Guene
2019-03-25 11:44 ` Sakari Ailus
2019-03-25 12:22 ` Mickael GUENE
2019-03-26 11:34 ` Sakari Ailus
2019-03-26 12:32 ` Mickael GUENE
2019-03-26 10:03 ` [PATCH v3 0/2] Add support for MIPID02 CSI-2 to PARALLEL bridge I2C device Mickael Guene
2019-03-26 10:03 ` [PATCH v3 1/2] dt-bindings: Document MIPID02 bindings Mickael Guene
2019-03-26 12:17 ` Sakari Ailus
2019-03-26 13:40 ` Mickael GUENE
2019-03-26 13:44 ` Sakari Ailus
2019-03-26 10:03 ` [PATCH v3 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver Mickael Guene
2019-03-26 11:33 ` Sakari Ailus
2019-03-26 12:57 ` Mickael GUENE
2019-03-26 13:54 ` Sakari Ailus
2019-03-26 14:12 ` Mickael GUENE [this message]
2019-03-26 14:14 ` Sakari Ailus
2019-03-26 14:36 ` Mickael GUENE
2019-04-06 11:01 ` Sakari Ailus
2019-04-08 6:17 ` Mickael GUENE
2019-04-08 9:21 ` Sakari Ailus
2019-03-27 9:55 ` [PATCH v4 0/2] Add support for MIPID02 CSI-2 to PARALLEL bridge I2C device Mickael Guene
2019-03-27 9:55 ` [PATCH v4 1/2] dt-bindings: Document MIPID02 bindings Mickael Guene
2019-03-28 17:43 ` Rob Herring
2019-04-06 10:35 ` Sakari Ailus
2019-04-06 10:38 ` Sakari Ailus
2019-04-08 6:20 ` Mickael GUENE
2019-03-27 9:55 ` [PATCH v4 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver Mickael Guene
[not found] ` <20190406105606.rciacao5d4hljbbu@kekkonen.localdomain>
2019-04-08 8:20 ` Mickael GUENE
2019-04-08 9:17 ` Sakari Ailus
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