ASoC: davinci-mcasp: set up channel status bits for S/PDIF mode

In DIT (S/PDIF) mode, program the transmitted user bits to reflect the
configured sample rate, along with some other details.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 47 insertions, 2 deletions

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 9afb14629a17..121971e1371e 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -27,6 +27,7 @@
 #include <linux/of_platform.h>
 #include <linux/of_device.h>
 
+#include <sound/asoundef.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -637,8 +638,12 @@ static int mcasp_i2s_hw_param(struct davinci_mcasp *mcasp, int stream)
 }
 
 /* S/PDIF */
-static int mcasp_dit_hw_param(struct davinci_mcasp *mcasp)
+static int mcasp_dit_hw_param(struct davinci_mcasp *mcasp,
+                              unsigned int rate)
 {
+        u32 cs_value = 0;
+        u8 *cs_bytes = (u8*) &cs_value;
+
         /* Set the TX format : 24 bit right rotation, 32 bit slot, Pad 0
            and LSB first */
         mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, TXROT(6) | TXSSZ(15));
@@ -660,6 +665,46 @@ static int mcasp_dit_hw_param(struct davinci_mcasp *mcasp)
         /* Enable the DIT */
         mcasp_set_bits(mcasp, DAVINCI_MCASP_TXDITCTL_REG, DITEN);
 
+        /* Set S/PDIF channel status bits */
+        cs_bytes[0] = IEC958_AES0_CON_NOT_COPYRIGHT;
+        cs_bytes[1] = IEC958_AES1_CON_PCM_CODER;
+
+        switch (rate) {
+        case 22050:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_22050;
+                break;
+        case 24000:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_24000;
+                break;
+        case 32000:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_32000;
+                break;
+        case 44100:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_44100;
+                break;
+        case 48000:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_48000;
+                break;
+        case 88200:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_88200;
+                break;
+        case 96000:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_96000;
+                break;
+        case 176400:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_176400;
+                break;
+        case 192000:
+                cs_bytes[3] |= IEC958_AES3_CON_FS_192000;
+                break;
+        default:
+                printk(KERN_WARNING "unsupported sampling rate: %d\n", rate);
+                return -EINVAL;
+        }
+
+        mcasp_set_reg(mcasp, DAVINCI_MCASP_DITCSRA_REG, cs_value);
+        mcasp_set_reg(mcasp, DAVINCI_MCASP_DITCSRB_REG, cs_value);
+
         return 0;
 }
 
@@ -692,7 +737,7 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
                 return ret;
 
         if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE)
-                ret = mcasp_dit_hw_param(mcasp);
+                ret = mcasp_dit_hw_param(mcasp, params_rate(params));
         else
                 ret = mcasp_i2s_hw_param(mcasp, substream->stream);