linux-kernel - Re: [PATCH v2 2/3] drm/vc4: Add HDMI audio support

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Message-ID: <87tw6tyts7.fsf@eliezer.anholt.net>
Date:   Thu, 16 Mar 2017 11:13:12 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Lee Jones <lee@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        dri-devel@...ts.freedesktop.org, Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        alsa-devel@...a-project.org
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stephen Warren <swarren@...dotorg.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v2 2/3] drm/vc4: Add HDMI audio support

Eric Anholt <eric@...olt.net> writes:

> The HDMI encoder IP embeds all needed blocks to output audio, with a
> custom DAI called MAI moving audio between the two parts of the HDMI
> core.  This driver now exposes a sound card to let users stream audio
> to their display.
>
> Using the hdmi-codec driver has been considered here, but MAI meant
> having to significantly rework hdmi-codec, and it would have left
> little shared code with the I2S mode anyway.
>
> The encoder requires that the audio be SPDIF-formatted frames only,
> which alsalib will format-convert for us.
>
> This patch is the combined work of Eric Anholt (initial register setup
> with a separate dmaengine driver and using simple-audio-card) and
> Boris Brezillon (moving it all into HDMI, massive debug to get it
> actually working), and which Eric has the permission to release.
>
> v2: Drop "-audio" from sound card name, since that's already implied
>     (suggestion by Boris)

On IRC, Mark Brown disclaimed responsibility for reviewing this code, so
I've merged it to drm-misc-next.

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