ASoC: update setting for pxa ssp slave mode

SCFR bit is required to be always set if pxa ssp is in slave mode. This bit
indicates clock input to SSPSCLK is only active during data transfers.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/pxa/pxa-ssp.c

@@ -462,9 +462,7 @@ static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 {
 	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
 	struct ssp_device *ssp = priv->ssp;
-	u32 sscr0;
-	u32 sscr1;
-	u32 sspsp;
+	u32 sscr0, sscr1, sspsp, scfr;
 
 	/* check if we need to change anything at all */
 	if (priv->dai_fmt == fmt)
@@ -479,16 +477,16 @@ static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 
 	/* reset port settings */
 	sscr0 = pxa_ssp_read_reg(ssp, SSCR0) &
-		(SSCR0_ECS |  SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
+		~(SSCR0_ECS |  SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
 	sscr1 = SSCR1_RxTresh(8) | SSCR1_TxTresh(7);
 	sspsp = 0;
 
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
-		sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR;
+		sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFS:
-		sscr1 |= SSCR1_SCLKDIR;
+		sscr1 |= SSCR1_SCLKDIR | SSCR1_SCFR;
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		break;
@@ -534,6 +532,17 @@ static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 	pxa_ssp_write_reg(ssp, SSCR1, sscr1);
 	pxa_ssp_write_reg(ssp, SSPSP, sspsp);
 
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+	case SND_SOC_DAIFMT_CBM_CFS:
+		scfr = pxa_ssp_read_reg(ssp, SSCR1) | SSCR1_SCFR;
+		pxa_ssp_write_reg(ssp, SSCR1, scfr);
+
+		while (pxa_ssp_read_reg(ssp, SSSR) & SSSR_BSY)
+			cpu_relax();
+		break;
+	}
+
 	dump_registers(ssp);
 
 	/* Since we are configuring the timings for the format by hand
@@ -583,10 +592,8 @@ static int pxa_ssp_hw_params(struct snd_pcm_substream *substream,
 
 	/* clear selected SSP bits */
 	sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~(SSCR0_DSS | SSCR0_EDSS);
-	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
 
 	/* bit size */
-	sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 #ifdef CONFIG_PXA3xx