[alsa-devel] [PATCH RFC 3/3] uda1380: make driver more powersave-friendly

Mark Brown broonie at opensource.wolfsonmicro.com
Sun Jun 27 22:55:29 CEST 2010

On 27 Jun 2010, at 11:43, Vasily Khoruzhick wrote:

> В сообщении от 27 июня 2010 13:10:54 автор Mark Brown написал:
>> Old drivers for fairly obscure chips aren't always a good guide to best
>> practices for things.

> Ok, what driver should I use as reference?

Off the top of my head WM8904 does regulator based power management.

>>> It's softreset and it's performed by writing some value to some reg. i2c
>>> xfers is not possible when codec is not enabled (it is not at this
>>> point)
>> It needs to happen at some point.
> Softreset is performed right after codec power on, it can't be performed 
> earlier.

After power on it's not needed, the device should be in the default state
already. It's only required on startup when there's no power control for the

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