[PATCH 1/7] drm/vc4: hdmi: Check that the monitor supports HDMI audio

[Eric Anholt]

Stefan Wahren <stefan.wahren at i2se.com> writes:

> Hi Maxime,
>
> Am 04.03.2019 um 15:52 schrieb Maxime Ripard:
>> The current code assumes as soon as the device is an HDMI one that it
>> supports an audio sink. However, strictly speaking, this is exposed as a
>> separate part of EDID.
>>
>> This can be checked through the drm_detect_monitor_audio function, so let's
>> use it and make sure that we can use the HDMI monitor as an output before
>> sending sound.
>
> does the audio output work in the following setup after applying this patch?
>
> VC4 --- HDMI Audio extractor --- Non audio capable monitor

A 1-minute google of audio extractors says they manage the EDID.  Do you
have some reason to think this wouldn't work?
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