ASoC: OMAP: Add support for mono audio links in McBSP DAI
Patch adds support for mono audio links so that McBSP DAI can operate with
real mono codecs. In I2S, the signalling remains the same but only first
frame (left channel) is transmitting audio data and second frame having null
data. In DSP_A, only first frame is transmitted.
Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 252bc7e..e8f1314 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -203,7 +203,7 @@
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
- int wlen;
+ int wlen, channels;
unsigned long port;
if (cpu_class_is_omap1()) {
@@ -232,12 +232,17 @@
return 0;
}
- switch (params_channels(params)) {
+ channels = params_channels(params);
+ switch (channels) {
case 2:
- /* Set 1 word per (McBPSP) frame and use dual-phase frames */
- regs->rcr2 |= RFRLEN2(1 - 1) | RPHASE;
+ /* Use dual-phase frames */
+ regs->rcr2 |= RPHASE;
+ regs->xcr2 |= XPHASE;
+ case 1:
+ /* Set 1 word per (McBSP) frame */
+ regs->rcr2 |= RFRLEN2(1 - 1);
regs->rcr1 |= RFRLEN1(1 - 1);
- regs->xcr2 |= XFRLEN2(1 - 1) | XPHASE;
+ regs->xcr2 |= XFRLEN2(1 - 1);
regs->xcr1 |= XFRLEN1(1 - 1);
break;
default:
@@ -266,8 +271,8 @@
regs->srgr1 |= FWID(wlen - 1);
break;
case SND_SOC_DAIFMT_DSP_A:
- regs->srgr2 |= FPER(wlen * 2 - 1);
- regs->srgr1 |= FWID(wlen * 2 - 2);
+ regs->srgr2 |= FPER(wlen * channels - 1);
+ regs->srgr1 |= FWID(wlen * channels - 2);
break;
}
@@ -457,13 +462,13 @@
.name = "omap-mcbsp-dai-"#link_id, \
.id = (link_id), \
.playback = { \
- .channels_min = 2, \
+ .channels_min = 1, \
.channels_max = 2, \
.rates = OMAP_MCBSP_RATES, \
.formats = SNDRV_PCM_FMTBIT_S16_LE, \
}, \
.capture = { \
- .channels_min = 2, \
+ .channels_min = 1, \
.channels_max = 2, \
.rates = OMAP_MCBSP_RATES, \
.formats = SNDRV_PCM_FMTBIT_S16_LE, \
