[alsa-devel] [PATCH 08/26] ASoC: SOF: token: add tokens for PCM compatible with D0i3 substate

[Pierre-Louis Bossart]

On 10/29/19 5:11 AM, Cezary Rojewski wrote:
> On 2019-10-26 00:41, Pierre-Louis Bossart wrote:
>> From: Keyon Jie <yang.jie at linux.intel.com>
>>
>> Add stream token SOF_TKN_STREAM_PLAYBACK_COMPATIBLE_D0I3 and
>> SOF_TKN_STREAM_CAPTURE_COMPATIBLE_D0I3 to denote if the stream can be
>> opened at low power d0i3 status or not.
>>
>> Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
>> Signed-off-by: Pierre-Louis Bossart 
>> <pierre-louis.bossart at linux.intel.com>
> 
> By any chance, can stream be playback D0ix incompatible but capture D0ix 
> compatible? Single token would suffice, no?

we discussed this on github. If we generalize this to low-power 
streaming, it's possible to have a case where the buffering is not 
suitable on capture but suitable on playback, or vice-versa, so we added 
two tokens.