ASoC: atmel_ssc_dai: enable fslen extension feature

When SSC work as master, it will generate the frame sync signal.
On old SoCs, it only supports frame sync length less or equal to
16bits, on newer SoCs, it supports frame sync length extension,
which can support frame size larger than 16 bits.
So, add this to make it supports playback 24/32 bits audio clips.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 18 insertions, 16 deletions

diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
index de433cfd044c..f403f399808a 100644
--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -347,6 +347,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
         u32 tfmr, rfmr, tcmr, rcmr;
         int start_event;
         int ret;
+        int fslen, fslen_ext;
 
         /*
          * Currently, there is only one set of dma params for
@@ -388,18 +389,6 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
         }
 
         /*
-         * The SSC only supports up to 16-bit samples in I2S format, due
-         * to the size of the Frame Mode Register FSLEN field.
-         */
-        if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
-                && bits > 16) {
-                printk(KERN_WARNING
-                                "atmel_ssc_dai: sample size %d "
-                                "is too large for I2S\n", bits);
-                return -EINVAL;
-        }
-
-        /*
          * Compute SSC register settings.
          */
         switch (ssc_p->daifmt
@@ -413,6 +402,17 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
                  * from the MCK divider, and the BCLK signal
                  * is output on the SSC TK line.
                  */
+
+                if (bits > 16 && !ssc->pdata->has_fslen_ext) {
+                        dev_err(dai->dev,
+                                "sample size %d is too large for SSC device\n",
+                                bits);
+                        return -EINVAL;
+                }
+
+                fslen_ext = (bits - 1) / 16;
+                fslen = (bits - 1) % 16;
+
                 rcmr =    SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
                         | SSC_BF(RCMR_STTDLY, START_DELAY)
                         | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
@@ -420,9 +420,10 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
                         | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
 
-                rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
+                rfmr =    SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
+                        | SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
                         | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
-                        | SSC_BF(RFMR_FSLEN, (bits - 1))
+                        | SSC_BF(RFMR_FSLEN, fslen)
                         | SSC_BF(RFMR_DATNB, (channels - 1))
                         | SSC_BIT(RFMR_MSBF)
                         | SSC_BF(RFMR_LOOP, 0)
@@ -435,10 +436,11 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
                         | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
                         | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
 
-                tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
+                tfmr =    SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
+                        | SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
                         | SSC_BF(TFMR_FSDEN, 0)
                         | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
-                        | SSC_BF(TFMR_FSLEN, (bits - 1))
+                        | SSC_BF(TFMR_FSLEN, fslen)
                         | SSC_BF(TFMR_DATNB, (channels - 1))
                         | SSC_BIT(TFMR_MSBF)
                         | SSC_BF(TFMR_DATDEF, 0)