[alsa-devel] Question about your DSP topic branch

Liam Girdwood lrg at slimlogic.co.uk
Thu Mar 31 23:35:22 CEST 2011

On Wed, 2011-03-30 at 23:40 -0700, Patrick Lai wrote:
> Hi Liam/Mark,
> In the back-end platform driver, routing table and array of widgets are 
> defined to describe interconnection of front-end and back-end. Instead 
> of defining FE and BE as AIF pin using SND_SOC_DAPM_AIF_IN/OUT macros,
> I would like to use SND_SOC_DAPM_AIF_IN_E/OUT_E macros. Essentially, I 
> want to register event handler to jump start routing in the DSP for a 
> newly activated FE under multiple streams to single HW path scenario. At 
> this time, BE is already activated so I need other mechanism to jump 
> start routing. I could put the logic in my front-end CPU DAI driver. 
> However, I feel that path setup should be handled by DAPM/DSP framework. 
> Hence, I am looking for a good place to trigger calling of event handler 
> in soc-dapm.c/soc-dsp.c. Any suggestion?

So iiuc, your BE is active (with another FE) and you then enable a
another FE that is connected to the already active BE ?

It should be possible to add support for the _E() macros in soc-dsp.c,
but I'm not sure why it's required atm since we dont need this for OMAP4


> Thanks
> Patrick

More information about the Alsa-devel mailing list