linux-kernel - Re: [PATCH 00/11] drm/vc4: hdmi: Enable Channel Mapping, IEC958, HBR Passthrough using hdmi-codec

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Date:   Mon, 24 May 2021 15:39:04 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        alsa-devel@...a-project.org, bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-rpi-kernel@...ts.infradead.org, Eric Anholt <eric@...olt.net>
Subject: Re: [PATCH 00/11] drm/vc4: hdmi: Enable Channel Mapping, IEC958, HBR
 Passthrough using hdmi-codec

Hi,

On Fri, May 07, 2021 at 04:03:23PM +0200, Maxime Ripard wrote:
> Hi,
> 
> hdmi-codec allows to have a lot of HDMI-audio related infrastructure in place,
> it's missing a few controls to be able to provide HBR passthrough. This series
> adds more infrastructure for the drivers, and leverages it in the vc4 HDMI
> controller driver.
> 
> One thing that felt a bit weird is that even though
> https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html#iec958-s-pdif
> mentions that the iec958 mask control should be a mixer control and the
> default control should be a PCM one, it feels a bit weird to have two different
> control type for two controls so similar, and other drivers are pretty
> inconsistent with this. Should we update the documentation?

Any comments on this series?
Thanks!
Maxime

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