diff options
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/atmel/mchp-pdmc.c | 40 |
1 files changed, 29 insertions, 11 deletions
diff --git a/sound/soc/atmel/mchp-pdmc.c b/sound/soc/atmel/mchp-pdmc.c index 260074018da9..d97d153ee375 100644 --- a/sound/soc/atmel/mchp-pdmc.c +++ b/sound/soc/atmel/mchp-pdmc.c @@ -90,6 +90,15 @@ #define MCHP_PDMC_DS_NO 2 #define MCHP_PDMC_EDGE_NO 2 +/* + * ---- DMA chunk size allowed ---- + */ +#define MCHP_PDMC_DMA_8_WORD_CHUNK 8 +#define MCHP_PDMC_DMA_4_WORD_CHUNK 4 +#define MCHP_PDMC_DMA_2_WORD_CHUNK 2 +#define MCHP_PDMC_DMA_1_WORD_CHUNK 1 +#define DMA_BURST_ALIGNED(_p, _s, _w) !(_p % (_s * _w)) + struct mic_map { int ds_pos; int clk_edge; @@ -511,15 +520,18 @@ static u32 mchp_pdmc_mr_set_osr(int audio_filter_en, unsigned int osr) return 0; } -static inline int mchp_pdmc_period_to_maxburst(int period_size) +static inline int mchp_pdmc_period_to_maxburst(int period_size, int sample_size) { - if (!(period_size % 8)) - return 8; - if (!(period_size % 4)) - return 4; - if (!(period_size % 2)) - return 2; - return 1; + int p_size = period_size; + int s_size = sample_size; + + if (DMA_BURST_ALIGNED(p_size, s_size, MCHP_PDMC_DMA_8_WORD_CHUNK)) + return MCHP_PDMC_DMA_8_WORD_CHUNK; + if (DMA_BURST_ALIGNED(p_size, s_size, MCHP_PDMC_DMA_4_WORD_CHUNK)) + return MCHP_PDMC_DMA_4_WORD_CHUNK; + if (DMA_BURST_ALIGNED(p_size, s_size, MCHP_PDMC_DMA_2_WORD_CHUNK)) + return MCHP_PDMC_DMA_2_WORD_CHUNK; + return MCHP_PDMC_DMA_1_WORD_CHUNK; } static struct snd_pcm_chmap_elem mchp_pdmc_std_chmaps[] = { @@ -547,14 +559,18 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, unsigned int channels = params_channels(params); unsigned int osr = 0, osr_start; unsigned int fs = params_rate(params); + int sample_bytes = params_physical_width(params) / 8; + int period_bytes = params_period_size(params) * + params_channels(params) * sample_bytes; + int maxburst; u32 mr_val = 0; u32 cfgr_val = 0; int i; int ret; - dev_dbg(comp->dev, "%s() rate=%u format=%#x width=%u channels=%u\n", + dev_dbg(comp->dev, "%s() rate=%u format=%#x width=%u channels=%u period_bytes=%d\n", __func__, params_rate(params), params_format(params), - params_width(params), params_channels(params)); + params_width(params), params_channels(params), period_bytes); if (channels > dd->mic_no) { dev_err(comp->dev, "more channels %u than microphones %d\n", @@ -608,7 +624,8 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, mr_val |= FIELD_PREP(MCHP_PDMC_MR_SINCORDER_MASK, dd->sinc_order); - dd->addr.maxburst = mchp_pdmc_period_to_maxburst(snd_pcm_lib_period_bytes(substream)); + maxburst = mchp_pdmc_period_to_maxburst(period_bytes, sample_bytes); + dd->addr.maxburst = maxburst; mr_val |= FIELD_PREP(MCHP_PDMC_MR_CHUNK_MASK, dd->addr.maxburst); dev_dbg(comp->dev, "maxburst set to %d\n", dd->addr.maxburst); @@ -760,6 +777,7 @@ static const struct snd_soc_dai_ops mchp_pdmc_dai_ops = { }; static struct snd_soc_dai_driver mchp_pdmc_dai = { + .name = "mchp-pdmc", .capture = { .stream_name = "Capture", .channels_min = 1, |