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SubjectRe: [PATCH v2 6/6] ASoC: atmel_ssc_dai: Enable shared FSYNC source in frame-slave mode
On Mon, Aug 26, 2019 at 03:05:06PM +0000, Codrin.Ciubotariu@microchip.com wrote:
> On 24.08.2019 23:26, Michał Mirosław wrote:
> > SSC driver allows only synchronous TX and RX. In slave mode for BCLK
> > it uses only one of TK or RK pin, but for LRCLK it configured separate
> > inputs from TF and RF pins. Allow configuration with common FS signal.
> >
> > Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> >
> > ---
> > v2: use alternate DT binding
> > split DT and drivers/misc changes
> >
> > ---
> > sound/soc/atmel/atmel_ssc_dai.c | 26 ++++++++++++++++++++++----
> > 1 file changed, 22 insertions(+), 4 deletions(-)
> >
> > diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
> > index 48e9eef34c0f..035d4da58f2b 100644
> > --- a/sound/soc/atmel/atmel_ssc_dai.c
> > +++ b/sound/soc/atmel/atmel_ssc_dai.c
> > @@ -605,14 +605,32 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
> > return -EINVAL;
> > }
> >
> > - if (!atmel_ssc_cfs(ssc_p)) {
> > + if (atmel_ssc_cfs(ssc_p)) {
> > + /*
> > + * SSC provides LRCLK
> > + *
> > + * Both TF and RF are generated, so use them directly.
> > + */
> > + rcmr |= SSC_BF(RCMR_START, fs_edge);
> > + tcmr |= SSC_BF(TCMR_START, fs_edge);
>
> Hmm, how would this work if capture and playback start/run at the same time?

Same as it did before this patch: as there is only one bi-directional link
between SSC and codec, whichever stream starts first defines the rate.

> > + } else {
> > fslen = fslen_ext = 0;
> > rcmr_period = tcmr_period = 0;
> > fs_osync = SSC_FSOS_NONE;
> > - }
> >
> > - rcmr |= SSC_BF(RCMR_START, fs_edge);
> > - tcmr |= SSC_BF(TCMR_START, fs_edge);
> > + if (ssc->lrclk_from_tf_pin) {
> > + rcmr |= SSC_BF(RCMR_START, SSC_START_TX_RX);
> > + tcmr |= SSC_BF(TCMR_START, fs_edge);
> > + } else if (ssc->lrclk_from_rf_pin) {
> > + /* assume RF is to be used when RK is used as BCLK input */
>
> This comment is not longer true...

Removed for next version.

>
> > + /* Note: won't work correctly on SAMA5D2 due to errata */
> > + rcmr |= SSC_BF(RCMR_START, fs_edge);
> > + tcmr |= SSC_BF(TCMR_START, SSC_START_TX_RX);
> > + } else {
> > + rcmr |= SSC_BF(RCMR_START, fs_edge);
> > + tcmr |= SSC_BF(TCMR_START, fs_edge);
> > + }
> > + }
> >
> > if (atmel_ssc_cbs(ssc_p)) {
> > /*
> >
>
> Thanks and best regards,
> Codrin

Best Regards,
Michał Mirosław

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