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

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Message-ID: <20111014190342.GA2931@opensource.wolfsonmicro.com>
Date:	Fri, 14 Oct 2011 20:03:42 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Peter Hsiang <Peter.Hsiang@...im-ic.com>
Cc:	Axel Lin <axel.lin@...il.com>, 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 at 10:40:58AM -0700, Peter Hsiang wrote:
> 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.

Writes to the cached region should be done within a cache_bypass flag to
deal with this.
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