https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/ca0106/ca0106_main.c

        if ((err = snd_pcm_hw_constraint_integer(runtime, 
SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
                return err;
        if ((err = snd_pcm_hw_constraint_step(runtime, 0, 
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64)) < 0)
                return err;


although ca0106 has smaller minimum period bytes than hda intel


the granularity is not depend on minimum period size but only on how often 
sound card can report hwptr in realtime

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https://bugs.launchpad.net/bugs/996906

Title:
  periodic audio skips with Intel HDA

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