linux-kernel - Re: [RFC][PATCH] ASoC: Fix sync reg_cache with the hardware in wm8990

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Message-ID: <CAF+7xW=Q_+Jq9j6X9XwB5jz5F6mxSOxKRwJBxmq9017qT0RyHg@mail.gmail.com>
Date:	Wed, 5 Oct 2011 18:39:57 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...com>,
	alsa-devel@...a-project.org
Subject: Re: [RFC][PATCH] ASoC: Fix sync reg_cache with the hardware in wm8990_resume

2011/10/5 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> On Wed, Oct 05, 2011 at 06:16:49PM +0800, Axel Lin wrote:
>> Current code has off-by-one bug of checking WM8990_RESET.
>> Besides, according to wm8990 datasheet (2-wire serial control mode):
>> A control word consists of 24 bits. The first 8 bits are address bits,
>> the remaining 16 bits are data bits.
>> Current code uses 7 bits address bits and 9 bits data bits which is incorrect.
>
> We should just convert drivers like this to snd_soc_cache_sync().

Yes. It would be better convert it to snd_soc_cache_sync().
Just think this patch may be useful for 3.1 or earlier kernel version.

Axel
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