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ASoC: fsl_ssi: Add monaural audio support for non-ac97 interface 

The normal mode of SSI allows it to send/receive data to/from the first
slot of each period. So we can use this normal mode to trick I2S signal
by puting/getting data to/from the first slot only (the left channel)
so as to support monaural audio playback and recording.

Signed-off-by: Nicolin Chen <b42378@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Nicolin Chen 2013-12-02 23:29:03 +08:00 committed by Mark Brown
parent 3621dbbc27
commit 2924a99810
1 changed files with 12 additions and 7 deletions
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19
sound/soc/fsl/fsl_ssi.c
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@ -143,6 +143,7 @@ struct fsl_ssi_private {
bool ssi_on_imx;
bool imx_ac97;
bool use_dma;
u8 i2s_mode;
struct clk *clk;
struct snd_dmaengine_dai_dma_data dma_params_tx;
struct snd_dmaengine_dai_dma_data dma_params_rx;
@ -354,14 +355,13 @@ static void fsl_ssi_setup_ac97(struct fsl_ssi_private *ssi_private)
static int fsl_ssi_setup(struct fsl_ssi_private *ssi_private)
{
struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
u8 i2s_mode;
u8 wm;
int synchronous = ssi_private->cpu_dai_drv.symmetric_rates;
if (ssi_private->imx_ac97)
i2s_mode = CCSR_SSI_SCR_I2S_MODE_NORMAL | CCSR_SSI_SCR_NET;
ssi_private->i2s_mode = CCSR_SSI_SCR_I2S_MODE_NORMAL | CCSR_SSI_SCR_NET;
else
i2s_mode = CCSR_SSI_SCR_I2S_MODE_SLAVE;
ssi_private->i2s_mode = CCSR_SSI_SCR_I2S_MODE_SLAVE;
/*
* Section 16.5 of the MPC8610 reference manual says that the SSI needs
@ -378,7 +378,7 @@ static int fsl_ssi_setup(struct fsl_ssi_private *ssi_private)
write_ssi_mask(&ssi->scr,
CCSR_SSI_SCR_I2S_MODE_MASK | CCSR_SSI_SCR_SYN,
CCSR_SSI_SCR_TFR_CLK_DIS |
i2s_mode |
ssi_private->i2s_mode |
(synchronous ? CCSR_SSI_SCR_SYN : 0));
write_ssi(CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TFEN0 |
@ -508,6 +508,7 @@ static int fsl_ssi_hw_params(struct snd_pcm_substream *substream,
{
struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
unsigned int channels = params_channels(hw_params);
unsigned int sample_size =
snd_pcm_format_width(params_format(hw_params));
u32 wl = CCSR_SSI_SxCCR_WL(sample_size);
@ -537,6 +538,11 @@ static int fsl_ssi_hw_params(struct snd_pcm_substream *substream,
else
write_ssi_mask(&ssi->srccr, CCSR_SSI_SxCCR_WL_MASK, wl);
if (!ssi_private->imx_ac97)
write_ssi_mask(&ssi->scr,
CCSR_SSI_SCR_NET | CCSR_SSI_SCR_I2S_MODE_MASK,
channels == 1 ? 0 : ssi_private->i2s_mode);
return 0;
}
@ -649,14 +655,13 @@ static const struct snd_soc_dai_ops fsl_ssi_dai_ops = {
static struct snd_soc_dai_driver fsl_ssi_dai_template = {
.probe = fsl_ssi_dai_probe,
.playback = {
/* The SSI does not support monaural audio. */
.channels_min = 2,
.channels_min = 1,
.channels_max = 2,
.rates = FSLSSI_I2S_RATES,
.formats = FSLSSI_I2S_FORMATS,
},
.capture = {
.channels_min = 2,
.channels_min = 1,
.channels_max = 2,
.rates = FSLSSI_I2S_RATES,
.formats = FSLSSI_I2S_FORMATS,