Re: [PATCH v4 14/36] [media] v4l2-mc: add a function to inherit controls from a pipeline

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On Sat, Mar 11, 2017 at 05:32:29PM +0200, Sakari Ailus wrote:
> My understanding of the i.MX6 case is the hardware is configurable enough
> to warrant the use of the Media controller API. Some patches indicate
> there are choices to be made in data routing.

The iMX6 does have configurable data routing, but in some scenarios
(eg, when receiving bayer data) there's only one possible routing.

> Steve: could you enlighten us on the topic, by e.g. doing media-ctl
> --print-dot and sending the results to the list? What kind of different IP
> blocks are there and what do they do? A pointer to hardware documentation
> wouldn't hurt either (if it's available).

Attached for the imx219 camera.  Note that although the CSI2 block has
four outputs, each output is dedicated to a CSI virtual channel, so
they can not be arbitarily assigned without configuring the sensor.

Since the imx219 only produces bayer, the graph is also showing the
_only_ possible routing for the imx219 configured for CSI virtual
channel 0.

The iMX6 manuals are available on the 'net.

	https://community.nxp.com/docs/DOC-101840

There are several chapters that cover the capture side:

* MIPI CSI2
* IPU CSI2 gasket
* IPU

The IPU not only performs capture, but also display as well.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
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	rankdir=TB
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	n00000027:port1 -> n0000002b:port0 [style=dashed]
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	n0000002e [label="ipu2_ic_prpenc capture\n/dev/video2", shape=box, style=filled, fillcolor=yellow]
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	n00000034:port1 -> n00000037 [style=dashed]
	n00000037 [label="ipu2_ic_prpvf capture\n/dev/video3", shape=box, style=filled, fillcolor=yellow]
	n0000003d [label="{{<port1> 1} | imx219 0-0010\n/dev/v4l-subdev11 | {<port0> 0}}", shape=Mrecord, style=filled, fillcolor=green]
	n0000003d:port0 -> n00000058:port0
	n00000040 [label="{{} | imx219 pixel 0-0010\n/dev/v4l-subdev10 | {<port0> 0}}", shape=Mrecord, style=filled, fillcolor=green]
	n00000040:port0 -> n0000003d:port1 [style=bold]
	n00000044 [label="{{<port0> 0} | ipu1_csi0\n/dev/v4l-subdev12 | {<port1> 1 | <port2> 2}}", shape=Mrecord, style=filled, fillcolor=green]
	n00000044:port2 -> n00000048
	n00000044:port1 -> n00000011:port0 [style=dashed]
	n00000044:port1 -> n00000009:port0 [style=dashed]
	n00000048 [label="ipu1_csi0 capture\n/dev/video4", shape=box, style=filled, fillcolor=yellow]
	n0000004e [label="{{<port0> 0} | ipu1_csi1\n/dev/v4l-subdev13 | {<port1> 1 | <port2> 2}}", shape=Mrecord, style=filled, fillcolor=green]
	n0000004e:port2 -> n00000052 [style=dashed]
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	n00000058:port1 -> n00000001:port0
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	n00000068:port2 -> n0000006c [style=dashed]
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}


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