When this driver runs the dai link frame clock, and noone has stated differently, assume that all the bits of a frame are used.
This relieves the cpu dai users from the duty to fill in the dividers for the common case.
Signed-off-by: Peter Rosin peda@axentia.se --- sound/soc/atmel/atmel_ssc_dai.c | 29 +++++++++++++++++++++++------ sound/soc/atmel/atmel_ssc_dai.h | 1 + 2 files changed, 24 insertions(+), 6 deletions(-)
diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c index 16e459aedffe..674191508437 100644 --- a/sound/soc/atmel/atmel_ssc_dai.c +++ b/sound/soc/atmel/atmel_ssc_dai.c @@ -380,6 +380,7 @@ static void atmel_ssc_shutdown(struct snd_pcm_substream *substream, ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST)); /* Clear the SSC dividers */ ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0; + ssc_p->forced_divider = 0; } spin_unlock_irq(&ssc_p->lock);
@@ -429,10 +430,12 @@ static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai, break;
case ATMEL_SSC_TCMR_PERIOD: + ssc_p->forced_divider |= BIT(ATMEL_SSC_TCMR_PERIOD); ssc_p->tcmr_period = div; break;
case ATMEL_SSC_RCMR_PERIOD: + ssc_p->forced_divider |= BIT(ATMEL_SSC_RCMR_PERIOD); ssc_p->rcmr_period = div; break;
@@ -459,6 +462,8 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, u32 tfmr, rfmr, tcmr, rcmr; int ret; int fslen, fslen_ext; + u32 tcmr_period; + u32 rcmr_period;
/* * Currently, there is only one set of dma params for @@ -470,6 +475,18 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, else dir = 1;
+ /* + * If the cpu dai should provide the frame clock, + * but noone has provided the dividers needed for + * that to work, fall back to something sensible. + */ + tcmr_period = ssc_p->tcmr_period; + if (!(ssc_p->forced_divider & BIT(ATMEL_SSC_TCMR_PERIOD))) + tcmr_period = snd_soc_params_to_frame_size(params) / 2 - 1; + rcmr_period = ssc_p->rcmr_period; + if (!(ssc_p->forced_divider & BIT(ATMEL_SSC_RCMR_PERIOD))) + rcmr_period = snd_soc_params_to_frame_size(params) / 2 - 1; + dma_params = ssc_p->dma_params[dir];
channels = params_channels(params); @@ -524,7 +541,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, fslen_ext = (bits - 1) / 16; fslen = (bits - 1) % 16;
- rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) + rcmr = SSC_BF(RCMR_PERIOD, rcmr_period) | SSC_BF(RCMR_STTDLY, START_DELAY) | SSC_BF(RCMR_START, SSC_START_FALLING_RF) | SSC_BF(RCMR_CKI, SSC_CKI_RISING) @@ -540,7 +557,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, | SSC_BF(RFMR_LOOP, 0) | SSC_BF(RFMR_DATLEN, (bits - 1));
- tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) + tcmr = SSC_BF(TCMR_PERIOD, tcmr_period) | SSC_BF(TCMR_STTDLY, START_DELAY) | SSC_BF(TCMR_START, SSC_START_FALLING_RF) | SSC_BF(TCMR_CKI, SSC_CKI_FALLING) @@ -606,7 +623,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, fslen_ext = (bits - 1) / 16; fslen = (bits - 1) % 16;
- rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) + rcmr = SSC_BF(RCMR_PERIOD, rcmr_period) | SSC_BF(RCMR_STTDLY, START_DELAY) | SSC_BF(RCMR_START, SSC_START_FALLING_RF) | SSC_BF(RCMR_CKI, SSC_CKI_RISING) @@ -623,7 +640,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, | SSC_BF(RFMR_LOOP, 0) | SSC_BF(RFMR_DATLEN, (bits - 1));
- tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) + tcmr = SSC_BF(TCMR_PERIOD, tcmr_period) | SSC_BF(TCMR_STTDLY, START_DELAY) | SSC_BF(TCMR_START, SSC_START_FALLING_RF) | SSC_BF(TCMR_CKI, SSC_CKI_FALLING) @@ -650,7 +667,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, * MCK divider, and the BCLK signal is output * on the SSC TK line. */ - rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) + rcmr = SSC_BF(RCMR_PERIOD, rcmr_period) | SSC_BF(RCMR_STTDLY, 1) | SSC_BF(RCMR_START, SSC_START_RISING_RF) | SSC_BF(RCMR_CKI, SSC_CKI_RISING) @@ -665,7 +682,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, | SSC_BF(RFMR_LOOP, 0) | SSC_BF(RFMR_DATLEN, (bits - 1));
- tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) + tcmr = SSC_BF(TCMR_PERIOD, tcmr_period) | SSC_BF(TCMR_STTDLY, 1) | SSC_BF(TCMR_START, SSC_START_RISING_RF) | SSC_BF(TCMR_CKI, SSC_CKI_FALLING) diff --git a/sound/soc/atmel/atmel_ssc_dai.h b/sound/soc/atmel/atmel_ssc_dai.h index 80b153857a88..75194f582131 100644 --- a/sound/soc/atmel/atmel_ssc_dai.h +++ b/sound/soc/atmel/atmel_ssc_dai.h @@ -113,6 +113,7 @@ struct atmel_ssc_info { unsigned short cmr_div; unsigned short tcmr_period; unsigned short rcmr_period; + unsigned int forced_divider; struct atmel_pcm_dma_params *dma_params[2]; struct atmel_ssc_state ssc_state; unsigned long mck_rate;