[Sound-open-firmware] [PTACH RFC 0/5] Add switch widget for loopback

[Pierre-Louis Bossart]

On 5/30/18 9:08 PM, Pan, Xiuli wrote:
> 
> 
> On 5/30/2018 21:06, Pierre-Louis Bossart wrote:
>> On 5/30/18 4:51 AM, Xiuli Pan wrote:
>>> From: Pan Xiuli <xiuli.pan at linux.intel.com>
>>>
>>> Have some clean up for the code may used.
>>> Add some macros that are needed for the switch widget.
>>> TODO: Have the useable get/put function for the kcontrol.
>>>
>>> Pan Xiuli (5):
>>>    topology: mixer: Add CONTROLMIXER_MIN
>>>    topology: utils: Add kdapm macro for route with kcontrol
>>>    topology: m4: add switch widget
>>>    topology: sof: add pipeline loopback dai
>>>    topology: test: add loopback test topology
>>
>> What do you mean by "loopback"?
>> a) enabling capture on SSP with hardware LBM (LoopBackMode) - 
>> mirroring the playback data?
>> b) enabling a capture-to-playback hostless pipeline - mirroring the 
>> capture data?
> I think the it should be the a). This will try to enable SSP driver 
> loopback mode with a kcontrol.

Not sure if it's wise to expose a kcontrol to users for what is largely 
a test capability - not to mention that you will not typically turn this 
on/off dynamically.
I'd suggest looking into using the topology+IPC to enable such custom tests.


> Maybe we can try to make the b) also work.
> 
> Thanks
> Xiuli
>>
>>
>>>
>>>   topology/m4/mixercontrol.m4               | 16 ++++--
>>>   topology/m4/switch.m4                     | 46 +++++++++++++++
>>>   topology/m4/utils.m4                      |  4 ++
>>>   topology/sof/pipe-dai-loopback.m4         | 36 ++++++++++++
>>>   topology/sof/pipe-low-latency-capture.m4  |  3 +-
>>>   topology/sof/pipe-low-latency-playback.m4 |  2 +
>>>   topology/sof/pipe-pcm-media.m4            |  1 +
>>>   topology/sof/pipe-tone.m4                 |  2 +
>>>   topology/sof/pipe-volume-capture.m4       |  1 +
>>>   topology/sof/pipe-volume-playback.m4      |  1 +
>>>   topology/test/test-loopback-ssp.m4        | 94 
>>> +++++++++++++++++++++++++++++++
>>>   topology/test/tplg-build.sh               |  2 +-
>>>   12 files changed, 201 insertions(+), 7 deletions(-)
>>>   create mode 100644 topology/m4/switch.m4
>>>   create mode 100644 topology/sof/pipe-dai-loopback.m4
>>>   create mode 100644 topology/test/test-loopback-ssp.m4
>>>
>>
> 
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