linux-kernel - Re: [PATCH 2/8] ASoC: tegra: Fix AMX byte map

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Date:   Thu, 22 Jun 2023 13:07:56 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     robh+dt@...nel.org, krzk+dt@...nel.org, thierry.reding@...il.com,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        jonathanh@...dia.com, mkumard@...dia.com, sheetal@...dia.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 2/8] ASoC: tegra: Fix AMX byte map

On Thu, Jun 22, 2023 at 05:04:10PM +0530, Sameer Pujar wrote:
> From: Sheetal <sheetal@...dia.com>
> 
> Byte mask for channel-1 of stream-1 is not getting enabled and this
> causes failures during AMX use cases. The enable bit is not set during
> put() callback of byte map mixer control.
> 
> This happens because the byte map value 0 matches the initial state
> of byte map array and put() callback returns without doing anything.
> 
> Fix the put() callback by actually looking at the byte mask array
> to identify if any change is needed and update the fields accordingly.

I'm not quite sure I follow the logic here - I'd have expected this to
mean that there's a bootstrapping issue and that we should be doing some
more initialisation during startup such that the existing code which
checks if there is a change will be doing the right thing?

> Also update get() callback to return 256 if the byte map is disabled.

This will be a user visible change.  It's not clear to me why it's
needed - it seems like it's a hack to push users to do an update in the
case where they want to use channel 1 stream 1?

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