linux-kernel - RE: [PATCH] ASoC: max98095: Convert codec->hw_write to snd_soc

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Message-ID: <B2150E1E4418E1438554A300EA5040E40DDFD2E54E@ITSVLEX06.it.maxim-ic.internal>
Date:	Fri, 14 Oct 2011 10:40:58 -0700
From:	Peter Hsiang <Peter.Hsiang@...im-ic.com>
To:	Axel Lin <axel.lin@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Liam Girdwood <lrg@...com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ASoC: max98095: Convert codec->hw_write to snd_soc_write

On Fri, Oct 14, 2011, Axel Lin wrote:
> codec->hw_write is broken now, convert codec->hw_write to
> snd_soc_write.
> 

The hardware has 2 banks of registers sharing a section in I2C register space.
The 1st bank is the primary one and is cached.  
The 2nd bank is for loading coefficients only and they do not need cache.
These coefficients registers are therefore direct writes.
Changing this to a cached write will overwrite the cache.

Peter