McBSP is able to drive bit clock and consume frame clock but BP_FC
format is not handled by McBSP driver.
Add BP_FC format support.
When BP_FC is selected:
- CLKX and CLKR are configured as outputs
- The sample rate generator is configured to be able to provide bit
clock.
Signed-off-by: Bastien Curutchet <bastien.curutchet@xxxxxxxxxxx>
---
sound/soc/ti/davinci-i2s.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/sound/soc/ti/davinci-i2s.c b/sound/soc/ti/davinci-i2s.c
index f9a67c2bc2f5..e51f05cda941 100644
--- a/sound/soc/ti/davinci-i2s.c
+++ b/sound/soc/ti/davinci-i2s.c
@@ -310,6 +310,12 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
pcr |= DAVINCI_MCBSP_PCR_SCLKME;
break;
+ case SND_SOC_DAIFMT_BP_FC:
+ /* cpu is bitclock provider */
+ pcr = DAVINCI_MCBSP_PCR_CLKXM |
+ DAVINCI_MCBSP_PCR_CLKRM;
+ break;
+
case SND_SOC_DAIFMT_BC_FC:
if (dev->tdm_slots || dev->slot_width) {
dev_err(dev->dev, "TDM is not supported for BC_FC format\n");
@@ -500,6 +506,23 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
clk_div &= 0xFF;
srgr |= clk_div;
break;
+ case SND_SOC_DAIFMT_BP_FC:
+ if (dev->ext_clk) {
+ freq = clk_get_rate(dev->ext_clk);
+ } else {
+ freq = clk_get_rate(dev->clk);
+ srgr = DAVINCI_MCBSP_SRGR_CLKSM;
+ }
+ if (dev->tdm_slots && dev->slot_width) {
+ clk_div = freq / (params->rate_num * params->rate_den)
+ / (dev->tdm_slots * dev->slot_width) - 1;
+ } else {
+ clk_div = freq / (mcbsp_word_length * 16) /
+ params->rate_num * params->rate_den;
+ }
+ clk_div &= 0xFF;
+ srgr |= clk_div;
+ break;
case SND_SOC_DAIFMT_BC_FC:
/* Clock and frame sync given from external sources */
i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
--
2.44.0
