[Sound-open-firmware] Any SOF pcm hw parameters change that can disable PAUSE on GLK?

[Lin, Mengdong]

Could someone share some insight here?

This is an issue observed by Marcin on GNL platform. 
When he runs 'aplay Ring09.wav -vv -I' and press SPACE to pause/resume, aplay will complain: PAUSE command ignored (no hw support)

aplay.c will call snd_pcm_hw_params_can_pause() and decide whethter HW supports pause. It seems hw parameter indicates that PAUSE cannot be supported.

Here is snd_pcm_hw_params_can_pause defined in alsa-lib pcm.c 
/**
3487  * \brief Check if hardware supports pause
3488  * \param params Configuration space
3489  * \retval 0 Hardware doesn't support pause
3490  * \retval 1 Hardware supports pause
3491  *
3492  * This function should only be called when the configuration space
3493  * contains a single configuration. Call #snd_pcm_hw_params to choose
3494  * a single configuration from the configuration space.
3495  */
3496 int snd_pcm_hw_params_can_pause(const snd_pcm_hw_params_t *params)
3497 {
3498         assert(params);
3499         if (CHECK_SANITY(params->info == ~0U)) {
3500                 SNDMSG("invalid PCM info field");
3501                 return 0; /* FIXME: should be a negative error? */
3502         }
3503         return !!(params->info & SNDRV_PCM_INFO_PAUSE);
3504 }

Thanks
Mengdong