25 Jul
2019
25 Jul
'19
8:24 p.m.
On Thu, Jul 25, 2019 at 03:02:34PM +0000, Codrin.Ciubotariu@microchip.com wrote:
On 22.07.2019 21:27, 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.
[...]
@@ -613,10 +607,30 @@ 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);- } else { fslen = fslen_ext = 0; rcmr_period = tcmr_period = 0; fs_osync = SSC_FSOS_NONE;
if (!ssc->shared_fs_pin) {rcmr |= SSC_BF(RCMR_START, fs_edge);tcmr |= SSC_BF(TCMR_START, fs_edge);} else if (ssc->clk_from_rk_pin) {/* assume RF is to be used when RK is used as BCLK input *//* Note: won't work correctly on SAMA5D2 due to errata */rcmr |= SSC_BF(RCMR_START, fs_edge);tcmr |= SSC_BF(TCMR_START, SSC_START_RECEIVE);Did you find a platform in which this mode works?
To be exact: according to the errata, TX is delayed improperly. So if you use only RX (SSC side receives) direction, you're fine.
Best Regards, Michał Mirosław