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ASoC: fsl_sai: add tdm slots operation support

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Add tdm slots operation support. If tdm slots and slot width have
been configured in machine driver, we should use these values.
Otherwise, using relevant channels and word length to set slots
and slot width.

SAI will generate BCLK depends on sample rate, slots and slot width.
And there may be unused BCLK cycles before each LRCLK transition.

Signed-off-by: Zidan Wang <zidan.wang@freescale.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Zidan Wang 2015-11-24 15:31:54 +08:00 committed by Mark Brown
parent 51659ca069
commit c1df29648f
2 changed files with 28 additions and 6 deletions
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31
sound/soc/fsl/fsl_sai.c
View file

@ -126,6 +126,17 @@ out:
return IRQ_HANDLED;
}
static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
u32 rx_mask, int slots, int slot_width)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
sai->slots = slots;
sai->slot_width = slot_width;
return 0;
}
static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int fsl_dir)
{
@ -395,11 +406,19 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
unsigned int channels = params_channels(params);
u32 word_width = snd_pcm_format_width(params_format(params));
u32 val_cr4 = 0, val_cr5 = 0;
u32 slots = (channels == 1) ? 2 : channels;
u32 slot_width = word_width;
int ret;
if (sai->slots)
slots = sai->slots;
if (sai->slot_width)
slot_width = sai->slot_width;
if (!sai->is_slave_mode) {
ret = fsl_sai_set_bclk(cpu_dai, tx,
2 * word_width * params_rate(params));
slots * slot_width * params_rate(params));
if (ret)
return ret;
@ -411,21 +430,20 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
sai->mclk_streams |= BIT(substream->stream);
}
}
if (!sai->is_dsp_mode)
val_cr4 |= FSL_SAI_CR4_SYWD(word_width);
val_cr4 |= FSL_SAI_CR4_SYWD(slot_width);
val_cr5 |= FSL_SAI_CR5_WNW(word_width);
val_cr5 |= FSL_SAI_CR5_W0W(word_width);
val_cr5 |= FSL_SAI_CR5_WNW(slot_width);
val_cr5 |= FSL_SAI_CR5_W0W(slot_width);
if (sai->is_lsb_first)
val_cr5 |= FSL_SAI_CR5_FBT(0);
else
val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
val_cr4 |= FSL_SAI_CR4_FRSZ(channels);
val_cr4 |= FSL_SAI_CR4_FRSZ(slots);
/*
* For SAI master mode, when Tx(Rx) sync with Rx(Tx) clock, Rx(Tx) will
@ -591,6 +609,7 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
.set_sysclk = fsl_sai_set_dai_sysclk,
.set_fmt = fsl_sai_set_dai_fmt,
.set_tdm_slot = fsl_sai_set_dai_tdm_slot,
.hw_params = fsl_sai_hw_params,
.hw_free = fsl_sai_hw_free,
.trigger = fsl_sai_trigger,

3
sound/soc/fsl/fsl_sai.h
View file

@ -143,6 +143,9 @@ struct fsl_sai {
unsigned int mclk_id[2];
unsigned int mclk_streams;
unsigned int slots;
unsigned int slot_width;
struct snd_dmaengine_dai_dma_data dma_params_rx;
struct snd_dmaengine_dai_dma_data dma_params_tx;
};