Re: [PATCH 18/22] partial revert of "[media] tvp5150: add HW input connectors support"

[Mauro Carvalho Chehab <mchehab+samsung@kernel.org>]

Em Tue, 31 Jul 2018 15:30:56 +0200
Marco Felsch <m.felsch@pengutronix.de> escreveu:

> Hi Javier,
> 
> On 18-07-31 14:52, Javier Martinez Canillas wrote:
> > Hi Marco,
> > 
> > On 07/31/2018 02:36 PM, Marco Felsch wrote:
> > 
> > [snip]
> >   
> > >>
> > >> Yes, another thing that patch 19/22 should take into account is DTs that
> > >> don't have input connectors defined. So probably TVP5150_PORT_YOUT should
> > >> be 0 instead of TVP5150_PORT_NUM - 1 as is the case in the current patch.
> > >>
> > >> In other words, it should work both when input connectors are defined in
> > >> the DT and when these are not defined and only an output port is defined.  
> > > 
> > > Yes, it would be a approach to map the output port dynamicaly to the
> > > highest port number. I tried to keep things easy by a static mapping.
> > > Maybe a follow up patch can change this behaviour.
> > > 
> > > Anyway, input connectors aren't required. There must be at least one
> > > port child node with a correct port-number in the DT.
> > >  
> > 
> > Yes, that was my point. But your patch uses the port child reg property as
> > the index for the struct device_node *endpoints[TVP5150_PORT_NUM] array.
> > 
> > If there's only one port child (for the output) then the DT binding says
> > that the reg property isn't required, so this will be 0 and your patch will
> > wrongly map it to TVP5150_PORT_AIP1A. That's why I said that the output port
> > should be the first one in your enum tvp5150_ports and not the last one.  
> 
> Yes, now I got you. I implemted this in such a way in my first apporach.
> But at the moment I don't know why I changed this. Maybe to keep the
> decoder->input number in sync with the em28xx devices, which will set the
> port by the s_routing() callback.
> 
> Let me check this.

Anyway, with the patchset I sent (with one fix), it will do the right
thing with regards to the pad output:
	https://git.linuxtv.org/mchehab/experimental.git/log/?h=tvp5150


$ mc_nextgen_test -D 
digraph board {
	rankdir=TB
	colorscheme=x11
	labelloc="t"
	label="Grabster AV 350
 driver:em28xx, bus: usb-0000:00:14.0-2
"
	intf_devnode_7 [label="intf_devnode_7\nvideo\n/dev/video0", shape=box, style=filled, fillcolor=yellow]
	intf_devnode_10 [label="intf_devnode_10\nvbi\n/dev/vbi0", shape=box, style=filled, fillcolor=yellow]
	entity_1 [label="{{<pad_2> 0 | <pad_3> 1 | <pad_4> 2} | entity_1\nATV decoder\ntvp5150 0-005c | {<pad_5> 3}}", shape=Mrecord, style=filled, fillcolor=lightblue]
	entity_6 [label="{{<pad_12> 0} | entity_6\nV4L I/O\n2-2:1.0 video}", shape=Mrecord, style=filled, fillcolor=aquamarine]
	entity_9 [label="{{<pad_13> 0} | entity_9\nVBI I/O\n2-2:1.0 vbi}", shape=Mrecord, style=filled, fillcolor=aquamarine]
	entity_14 [label="{entity_14\nunknown entity type\nComposite | {<pad_15> 0}}", shape=Mrecord, style=filled, fillcolor=cadetblue]
	entity_16 [label="{entity_16\nunknown entity type\nS-Video | {<pad_17> 0}}", shape=Mrecord, style=filled, fillcolor=cadetblue]
	intf_devnode_7 -> entity_6 [dir="none" color="orange"]
	intf_devnode_10 -> entity_9 [dir="none" color="orange"]
	entity_1:pad_5 -> entity_6:pad_12 [color=blue]
	entity_1:pad_5 -> entity_9:pad_13 [color=blue]
	entity_14:pad_15 -> entity_1:pad_2 [color=blue]
	entity_16:pad_17 -> entity_1:pad_2 [color=blue style="dashed"]
}

It won't do the right thing with regards to the input, though, as
the code at v4l2-mc.c expects just one input. So, both composite and
S-Video connectors (created outside tvp5150, based on the input entries
at em28xx cards table) are linked to pad 0. 

Thanks,
Mauro