[PATCH] soundwire: stream: only change state if needed

[Srinivas Kandagatla]

On 17/03/2020 12:22, Pierre-Louis Bossart wrote:
> Hi Srinivas,
> 
>> This patch did not work for me as it is as wsa881x codec does prepare 
>> and enable in one function, which breaks some of the assumptions in 
>> this patch.
> 
> Ah yes, if two transitions happen in the same DAI callback that wouldn't 
> work indeed. We should probably add this restriction to the state 
> machine documentation, the suggested mapping from ASoC DAI states to 
> stream states did not account for compound cases.
> 
>> However with below change I could get it working without moving stream 
>> handling to machine driver.
> 
> The change below would be an error case for Intel, so it's probably 
> better if we go with your suggestion. You have a very specific state 
> handling due to your power amps and it's probably better to keep it 
> platform-specific.
> 
> Can you confirm though that this patch works fine if you move all the 
> stream transitions to the machine driver? That should be a no-op but 
> better make sure there's no misunderstanding.

yes, it works with this patch + moving wsa stream handing to machine driver.

--srini
> 
> Thanks
> -Pierre