Re: [PATCH v2 2/2] ASoC: fsl_sai: Refine enable and disable sequence for synchronous mode

From: Shengjiu Wang
Date: Wed Aug 05 2020 - 01:03:50 EST

On Wed, Aug 5, 2020 at 12:13 PM Nicolin Chen <nicoleotsuka@xxxxxxxxx> wrote:
> On Wed, Aug 05, 2020 at 10:23:53AM +0800, Shengjiu Wang wrote:
> > Tx synchronous with Rx:
> > The TCSR.TE is no need to enabled when only Rx is going to be enabled.
> > Check if need to disable RSCR.RE before disabling TCSR.TE.
> >
> > Rx synchronous with Tx:
> > The RCSR.RE is no need to enabled when only Tx is going to be enabled.
> > Check if need to disable TSCR.RE before disabling RCSR.TE.
> Please add to the commit log more context such as what we have
> discussed: what's the problem of the current driver, and why we
> _have_to_ apply this change though it's sightly against what RM
> recommends.
> (If thing is straightforward, it's okay to make the text short.
> Yet I believe that this change deserves more than these lines.)
> One info that you should mention -- also the main reason why I'm
> convinced to add this change: trigger() is still in the shape of
> the early version where we only supported one operation mode --
> Tx synchronous with Rx. So we need an update for other modes.
> > Signed-off-by: Shengjiu Wang <>
> The git-diff part looks good, please add this in next ver.:
> Reviewed-by: Nicolin Chen <nicoleotsuka@xxxxxxxxx>
> Btw, the new fsl_sai_dir_is_synced() can be probably applied to
> other places with a followup patch.
Do you mean move it to the beginning of this file?

best regards
wang shengjiu