[alsa-devel] [PATCH] add support to reorder CPU and Codec DAI suspend/resume

[Barry Song]

On Wed, Nov 11, 2009 at 10:42 PM, Mark Brown
<broonie at opensource.wolfsonmicro.com> wrote:
> On Wed, Nov 11, 2009 at 10:34:00PM +0800, Barry Song wrote:
>
>> The only difference should be whether clock/sync is fired from codec
>> before or after TDM interfaces are resumed to be ready for the
>> different resume order of CPU and Codec DAI, as I guess. That's
>> difficult to explain why.
>
> It'd really like to understand what's going wrong with the controller
> here - it should just sync up off the frame sync signal.

Don't know what happens exactly in hardware controllers . But I
"fixed" this porblem by isolating interfaces's sync/clock pins from
Codec(config them to GPIOs), then the whole system gets normal. Since
you have a plan for pm-link, I will use this way to keep the fix in
blackfin locally.

>