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

[Mark Brown]

On Thu, Jun 22, 2023 at 05:04:10PM +0530, Sameer Pujar wrote:
> From: Sheetal <sheetal@xxxxxxxxxx>
> 
> 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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