AC97 configures most of registers earlier to start a communication
with CODECs in order to successfully initialize CODEC. Currently,
_fsl_ssi_set_dai_fmt() and fsl_ssi_setup_ac97() are called to get
all SSI registers properly set.

Since now the driver has a fsl_ssi_hw_init() to handle all register
initial settings, this patch moves those register settings of AC97
to the fsl_ssi_hw_init() as well.

Meanwhile it applies _fsl_ssi_set_dai_fmt() call to AC97 only since
other formats would be configured via normal set_dai_fmt() directly.

This patch also adds fsl_ssi_hw_clean() to cleanup control bits for
AC97 in the platform remote() function.

Signed-off-by: Nicolin Chen <nicoleots...@gmail.com>
Tested-by: Caleb Crome <ca...@crome.org>
Tested-by: Maciej S. Szmigiero <m...@maciej.szmigiero.name>
Reviewed-by: Maciej S. Szmigiero <m...@maciej.szmigiero.name>
---
 sound/soc/fsl/fsl_ssi.c | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 36f3d51..dfb0da3 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -987,9 +987,6 @@ static int _fsl_ssi_set_dai_fmt(struct device *dev,
        regmap_write(regs, REG_SSI_SRCR, srcr);
        regmap_write(regs, REG_SSI_SCR, scr);
 
-       if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_AC97)
-               fsl_ssi_setup_ac97(ssi);
-
        return 0;
 }
 
@@ -1255,10 +1252,34 @@ static int fsl_ssi_hw_init(struct fsl_ssi *ssi)
                regmap_update_bits(ssi->regs, REG_SSI_SCR,
                                   SSI_SCR_TCH_EN, SSI_SCR_TCH_EN);
 
+       /* AC97 should start earlier to communicate with CODECs */
+       if (fsl_ssi_is_ac97(ssi)) {
+               _fsl_ssi_set_dai_fmt(ssi->dev, ssi, ssi->dai_fmt);
+               fsl_ssi_setup_ac97(ssi);
+       }
+
        return 0;
 }
 
 /**
+ * Clear SSI registers
+ */
+static void fsl_ssi_hw_clean(struct fsl_ssi *ssi)
+{
+       /* Disable registers for AC97 */
+       if (fsl_ssi_is_ac97(ssi)) {
+               /* Disable TE and RE bits first */
+               regmap_update_bits(ssi->regs, REG_SSI_SCR,
+                                  SSI_SCR_TE | SSI_SCR_RE, 0);
+               /* Disable AC97 mode */
+               regmap_write(ssi->regs, REG_SSI_SACNT, 0);
+               /* Unset WAIT bits */
+               regmap_write(ssi->regs, REG_SSI_SOR, 0);
+               /* Disable SSI -- software reset */
+               regmap_update_bits(ssi->regs, REG_SSI_SCR, SSI_SCR_SSIEN, 0);
+       }
+}
+/**
  * Make every character in a string lower-case
  */
 static void make_lowercase(char *s)
@@ -1540,9 +1561,6 @@ static int fsl_ssi_probe(struct platform_device *pdev)
        }
 
 done:
-       if (ssi->dai_fmt)
-               _fsl_ssi_set_dai_fmt(dev, ssi, ssi->dai_fmt);
-
        /* Initially configures SSI registers */
        fsl_ssi_hw_init(ssi);
 
@@ -1592,6 +1610,9 @@ static int fsl_ssi_remove(struct platform_device *pdev)
        if (ssi->pdev)
                platform_device_unregister(ssi->pdev);
 
+       /* Clean up SSI registers */
+       fsl_ssi_hw_clean(ssi);
+
        if (ssi->soc->imx)
                fsl_ssi_imx_clean(pdev, ssi);
 
-- 
2.1.4

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