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

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Message-ID: <20170228101917.40810aa9@bbrezillon>
Date:   Tue, 28 Feb 2017 10:19:17 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     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,
        Stefan Wahren <stefan.wahren@...e.com>,
        Stephen Warren <swarren@...dotorg.org>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] drm/vc4: Add HDMI audio support

On Mon, 27 Feb 2017 12:28:02 -0800
Eric Anholt <eric@...olt.net> wrote:

> 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)
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>