Question regarding HDMI Audio support on i.MX6 with vanilla kernel

[Russell King - ARM Linux]

On Tue, Nov 07, 2017 at 05:58:19PM +0000, Luís Mendes wrote:
> On Tue, Nov 7, 2017 at 5:45 PM, Russell King - ARM Linux <
> linux at armlinux.org.uk> wrote:
> > Can you confirm that it also gives no EDID when plugged into another
> > machine?  I don't see evidence via google that other people have a
> > problem with the monitor - and in this day and age, a monitor missing
> > all EDID is just completely perverse, especially if it has a HDMI
> > socket.  (EDID is basically a requirement for HDMI, it isn't optional.)
>
> You are right... the monitor does have EDID. I've just connected it to my
> laptop. Binary in attachment, parsed edid below.

Thanks.

Your EDID block contains this CEA extension:

00000080  02 03 1c f3 48 90 04 1f  05 14 13 03 12 23 09 07  |....H........#..|
00000090  07 83 01 00 00 66 03 0c  00 10 00 80 01 1d 80 d0  |.....f..........|
000000a0  72 1c 16 20 10 2c 25 80  a0 5a 00 00 00 9e 01 1d  |r.. .,%..Z......|
000000b0  80 18 71 1c 16 20 58 2c  25 00 a0 5a 00 00 00 9e  |..q.. X,%..Z....|
000000c0  01 1d 00 bc 52 d0 1e 20  b8 28 55 40 a0 5a 00 00  |....R.. .(U at .Z..|
000000d0  00 1e 01 1d 00 72 51 d0  1e 20 6e 28 55 00 a0 5a  |.....rQ.. n(U..Z|
000000e0  00 00 00 1e 8c 0a d0 90  20 40 31 20 0c 40 55 00  |........ @1 . at U.|
000000f0  a0 5a 00 00 00 18 00 00  00 00 00 00 00 00 00 75  |.Z.............u|

which gives:

48 90 04 1f 05 14 13 03 12 <= video block
23 09 07 07 <= audio block (32kHz, 44.1kHz, 48kHz)
83 01 00 00 <= speaker allocation block
66 03 0c 00 10 00 80 <= HDMI vendor block

That looks all good from the HDMI audio point of view.

> > I wonder if your board is missing something - maybe the 5V supply to
> > the HDMI socket is missing (which is a requirement in the HDMI spec
> > for the DDC bus to be usable.)
> 
> Yes, it looks like there is something with the board. Although my home TVs
> now work since I changed to i2c2.

Which board is this?  Are any schematics available?

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