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 <[e-mail]>
Acked-by: Nicolas Ferre <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

include/linux/atmel-ssc.h

···
 #define SSC_RFMR_DATNB_OFFSET			 8
 #define SSC_RFMR_FSEDGE_SIZE			 1
 #define SSC_RFMR_FSEDGE_OFFSET			24
+/*
+ * The FSLEN_EXT exist on at91sam9rl, at91sam9g10,
+ * at91sam9g20, and at91sam9g45 and newer SoCs
+ */
+#define SSC_RFMR_FSLEN_EXT_SIZE			 4
+#define SSC_RFMR_FSLEN_EXT_OFFSET		28
 #define SSC_RFMR_FSLEN_SIZE			 4
 #define SSC_RFMR_FSLEN_OFFSET			16
 #define SSC_RFMR_FSOS_SIZE			 4
···
 #define SSC_TFMR_FSDEN_OFFSET			23
 #define SSC_TFMR_FSEDGE_SIZE			 1
 #define SSC_TFMR_FSEDGE_OFFSET			24
+/*
+ * The FSLEN_EXT exist on at91sam9rl, at91sam9g10,
+ * at91sam9g20, and at91sam9g45 and newer SoCs
+ */
+#define SSC_TFMR_FSLEN_EXT_SIZE			 4
+#define SSC_TFMR_FSLEN_EXT_OFFSET		28
 #define SSC_TFMR_FSLEN_SIZE			 4
 #define SSC_TFMR_FSLEN_OFFSET			16
 #define SSC_TFMR_FSOS_SIZE			 3

sound/soc/atmel/atmel_ssc_dai.c

···
 	u32 tfmr, rfmr, tcmr, rcmr;
 	int start_event;
 	int ret;
+	int fslen, fslen_ext;
 
 	/*
 	 * Currently, there is only one set of dma params for
···
 	}
 
 	/*
-	 * 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
···
 		 * 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)
···
 			| 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)
···
 			| 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)