[alsa-devel] [PATCH] ALSA: ASoC: cs4720: use snd_soc_cache_sync()

Mark Brown broonie at opensource.wolfsonmicro.com
Tue Nov 22 16:53:40 CET 2011

On Tue, Nov 22, 2011 at 04:44:39PM +0100, Daniel Mack wrote:

> The code is so simple that I'm starting to suspect
> i2c_smbus_write_byte_data() is doing something very wrong, but I can't
> trace it without a hardware I2C analyzer right now. The i2c-regmap
> low-level implementation uses different access functions under the hood,
> so maybe that's a regression.

Could be, though I can't see any changes in the code here.  It might be
that a change between SMBus and regmap at runtime is upsetting the
device somehow but given that it's supposed to be coming back from a
power on reset...

> We also think that the effect is actually rather new.

Does reverting to the non-regmap soc-io.c help?

> > In any case, the patch is moving to factor code out in favour of core
> > facilities so it's a good idea anyway.

> Hmm, we should really care for the root cause, but maybe we can still
> commit this thing, with a more appropriate commit log?

I think so.

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