[Sound-open-firmware] Input/output error for simple pipeline with mixer

[Trzcinski, KarolX]

Hi Daniel,

I've never met such an behavior and I've no idea what may be the root 
cause. Did you check how generic the problem is (topology/platform 
dependent)?

Karol

W dniu 21.07.2020 o 20:03, Pierre-Louis Bossart pisze:
>
>
> On 7/21/20 8:50 AM, Daniel Baluta wrote:
>> Hi Tomasz, Karol, Ranjani,
>>
>> I wonder if you have any clues on why $subject happens.
>>
>> We have a simple pipeline like this:
>>
>> PCM0  --> B0--+
>>                           |--mixer-->B1-->DAI
>> PCM1 --> B1--+
>>
>> Subdevices are created like this:
>>
>> oot at imx8qxpc0mek:~# aplay -l
>> **** List of PLAYBACK Hardware Devices ****
>> card 0: sofwm8960audio [sof-wm8960-audio], device 0: Port0 (*) []
>>    Subdevices: 1/1
>>    Subdevice #0: subdevice #0
>> card 0: sofwm8960audio [sof-wm8960-audio], device 1: Passthrough
>> Playback 1 (*) []
>>    Subdevices: 1/1
>>    Subdevice #0: subdevice #0
>>
>> But, when we use aplay in the following order:
>>
>> $ (1) aplay -Dhw:0,1 -f S32_LE -c 2 -r 48000 file1.wav
>> $ (2) aplay -Dhw:0,0 -f S32_LE -c 2 -r 48000 file0.wav
>>
>> everything is OK, mixing works.
>>
>> But when the order is reversed:
>>
>> $ (2) aplay -Dhw:0,0 -f S32_LE -c 2 -r 48000 file0.wav
>> $ (1) aplay -Dhw:0,1 -f S32_LE -c 2 -r 48000 file1.wav
>>
>> (1) aplay exists with an error:
>> aplay: pcm_write:2057: write error: Input/output error
>>
>> I wonder if you met this. Topology looks to be symmetric
>> with respect to PCM0/PCM1.
>
> Maybe an issue with the scheduling dependencies?
>
> This looks similar to what I recently changed for 
> Baytrail/CherryTrail, and I had to go through some hoops to make sure 
> both 'host' pipelines were scheduled based the DAI pipeline:
>
> https://github.com/thesofproject/sof/blob/master/tools/topology/sof-byt-codec.m4 
>
>