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...

...

• /* restore registers by regcache_sync */
  

• fsl_esai_register_restore(esai_priv);
  

• regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR,
  

•                    ESAI_xCR_xPR_MASK, 0);
  

• regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR,
  

•                    ESAI_xCR_xPR_MASK, 0);
  

And just for curious, can (or shall) we stuff this personal reset to the reset() function? I found this one is a part of the reset routine being mentioned in the RM -- it was done after ESAI reset is

done via ECR register.

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...

There is a problem to do this, TPR/RPR need to be clear after configure the control register. (TCCR, TCR). So it seems not only one place (reset function) need to be changed.

Do you know (or remember) why we suddenly involve this TPR/PRP? The driver has no problem so far, even if we don't have them.

The "personal reset" sounds like a feature that we would use to reset TX or RX individually, while this hw_reset() does a full reset for both TX and RX. So I wonder whether they're necessary.

The hw_reset flow is suggested by design team, so involve TRP/RPP is from them, I don't know the detail.

Best regards Wang shengjiu