[alsa-devel] [PATCH 1/5] ASoC: Hold runtime PM references to components of active DAIs

[Peter Ujfalusi]

On 12/05/2011 02:01 AM, Mark Brown wrote:
> Every device that implements runtime power management for DAIs is doing
> it in pretty much the same way: in the startup callback they take a
> runtime PM reference and then in the shutdown callback they release that
> reference, keeping the device active while the DAI is active. Given the
> frequency with which this is done and the obviousness of the need to keep
> the device active in this period factor the code out into the core, taking
> references on the device for each CPU DAI, CODEC DAI and DMA device in the
> core.
> 
> As runtime PM is reference counted this shouldn't interfere with any
> other reference holding by the drivers, and since (in common with the
> existing implementations) we don't check for errors on enabling it
> shouldn't matter if the device actually has runtime PM enabled or not.
> 
> Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>

Tested-by: Peter Ujfalusi <peter.ujfalusi at ti.com>