From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jyri Sarha <jsarha@ti.com>
Subject: Re: [RFC v3 7/7] ASoC: hdmi-codec: Add ELD control
Date: Tue, 19 Jan 2016 14:47:33 +0200
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To: Takashi Iwai <tiwai@suse.de>
Cc: Jean-Francois Moine <moinejf@free.fr>, alsa-devel@alsa-project.org, Lars-Peter Clausen <lars@metafoo.de>, Russell King - ARM Linux <linux@arm.linux.org.uk>, kernel@pengutronix.de, Arnaud Pouliquen <arnaud.pouliquen@st.com>, Koro Chen <koro.chen@mediatek.com>, Daniel Kurtz <djkurtz@chromium.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, linux-mediatek@lists.infradead.org, Philipp Zabel <p.zabel@pengutronix.de>, Matthias Brugger <matthias.bgg@gmail.com>, Cawa Cheng <cawa.cheng@mediatek.com>
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On 01/19/16 14:05, Takashi Iwai wrote:
> On Tue, 19 Jan 2016 13:00:05 +0100,
> Jyri Sarha wrote:
>>
>> On 01/12/16 17:38, Philipp Zabel wrote:
>>> Exporting the ELD bytes to userspace allows an application to select
>>> an appropriate audio format depending on the current capabilities of
>>> the connected HDMI sink device.
>>>
>>
>> This looks good, but I was unable to test it. Obviously amixer or
>> alsamixer is unable to show anything about an ELD mixer element,
>
> You can use amixer cget command to retrieve the information.
>
>> but
>> shouldn't there be something about it shown under /proc/asound/card0/,
>> or am I mistaken.
>
> It's specific to driver.  HD-audio has one, but it doesn't show the
> whole ELD but only parsed contents.
>
>

Thanks,
I managed the read the ELD bytes with:

amixer -c0 cget iface=PCM,name='ELD',device=0

And the numbers change a bit when I connect to a different TV, so:

Reviewed-by: Jyri Sarha <jsarha@ti.com>
Tested-by: Jyri Sarha <jsarha@ti.com>

Cheers,
Jyri