linux-kernel - Re: [PATCH 2/2] ASoC: Codec: wm8962: declare ALC Coefficients as 4 separate registers

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Message-ID: <20151022123830.GF8232@sirena.org.uk>
Date:	Thu, 22 Oct 2015 13:38:30 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Jiada Wang <jiada_wang@...tor.com>
Cc:	lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
	patches@...nsource.wolfsonmicro.com, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ASoC: Codec: wm8962: declare ALC Coefficients as 4
 separate registers

On Tue, Oct 20, 2015 at 11:47:12AM +0900, Jiada Wang wrote:
> As ALC2 register is volatile, declare it as one of ALC Coefficients
> register together with other non-volatile registers will cause issue,
> in case wm8962 has enter suspend mode, and cache_only flag is set,
> any attempt to read from ALC2 will fail.
> 
> Instead of declaring one ALC Coefficients register which contains
> ALC1 ~ ALC3 and Noise Gate, this patch declares 4 separate registers,
> so that regmap can handle these registers differently based on their
> classification.

In addition to the issue with the ABI change that Charles raised this
also doesn't entirely fix the issue in that we still have a control that
is going to give an error in suspend mode.  Charles' suggestion seems
like it's more likely to be helpful to users.

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