RE: [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago board

[Lu, Brent]

> 
> For avoid further misunderstanding: it's fine that CRAS *uses* such a short
> period.  It's often required for achieving a short latency.
> 
> However, the question is whether the driver can set *only* this value for
> making it working.  IOW, if we don't have this constraint, what actually
> happens?  If the driver gives the period size alignment, wouldn't CRAS
> choose 240?

It won't. Without the constraint it becomes 432. Actually CRAS does not set
period size specifically so the value depends on the constraint rules.

[   52.011146] sound pcmC1D0p: hw_param
[   52.011152] sound pcmC1D0p:   ACCESS 0x1
[   52.011155] sound pcmC1D0p:   FORMAT 0x4
[   52.011158] sound pcmC1D0p:   SUBFORMAT 0x1
[   52.011161] sound pcmC1D0p:   SAMPLE_BITS [16:16]
[   52.011164] sound pcmC1D0p:   FRAME_BITS [32:32]
[   52.011167] sound pcmC1D0p:   CHANNELS [2:2]
[   52.011170] sound pcmC1D0p:   RATE [48000:48000]
[   52.011173] sound pcmC1D0p:   PERIOD_TIME [9000:9000]
[   52.011176] sound pcmC1D0p:   PERIOD_SIZE [432:432]
[   52.011179] sound pcmC1D0p:   PERIOD_BYTES [1728:1728]
[   52.011182] sound pcmC1D0p:   PERIODS [474:474]
[   52.011185] sound pcmC1D0p:   BUFFER_TIME [4266000:4266000]
[   52.011188] sound pcmC1D0p:   BUFFER_SIZE [204768:204768]
[   52.011191] sound pcmC1D0p:   BUFFER_BYTES [819072:819072]
[   52.011194] sound pcmC1D0p:   TICK_TIME [0:0]

Regards,
Brent

> 
> 
> Takashi