linux-kernel - Re: [RFC PATCH 0/5] Apple Macs machine-level ASoC driver

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Message-ID: <YmKeEKa0w2xLM9cL@sirena.org.uk>
Date:   Fri, 22 Apr 2022 13:22:40 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Martin Povišer <povik@...ebit.org>
Cc:     Martin Povišer <povik+lin@...ebit.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Kettenis <kettenis@...nbsd.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>
Subject: Re: [RFC PATCH 0/5] Apple Macs machine-level ASoC driver

On Fri, Apr 22, 2022 at 01:44:06PM +0200, Martin Povišer wrote:

> > So previously each speaker would get two slots but now it just gets one?

> No the other way around. Previously (with the driver as it is RFCed),
> each speaker gets a single slot, and 'Left', 'Right' and ‘LeftRight'
> values of the routing control don't do anything different from each
> other (well except maybe 'LeftRight' lessens the volume due to how
> the chip handles the edge case of mixing down two channels from the
> same slot).

> With the new arrangement I am proposing, the two speakers in a left-right
> pair get both the same two slots, meaning they get to choose one of the
> two slots based on the 'Left' 'Right' value of their routing control.

Ah, I think the confusion here is that I'm using slot and channel
interchangably whereas you're saying that previously the driver would
allocate two channels to each speaker with duplicate data?

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