[PATCH 1/6] ASoC: fsl_ssi: enable IPG clock during AC'97 reg access

From: Maciej S. Szmigiero
Date: Sun Jun 28 2015 - 09:44:53 EST


IPG clock have to be enabled during AC'97 CODEC register
access in fsl_ssi driver.

Signed-off-by: Maciej Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx>
---
sound/soc/fsl/fsl_ssi.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index c7647e0..9c46c7d 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -1127,10 +1127,17 @@ static void fsl_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
struct regmap *regs = fsl_ac97_data->regs;
unsigned int lreg;
unsigned int lval;
+ int ret;

if (reg > 0x7f)
return;

+ ret = clk_prepare_enable(fsl_ac97_data->clk);
+ if (ret) {
+ pr_err("ac97 write clk_prepare_enable failed: %d\n",
+ ret);
+ return;
+ }

lreg = reg << 12;
regmap_write(regs, CCSR_SSI_SACADD, lreg);
@@ -1141,6 +1148,8 @@ static void fsl_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
regmap_update_bits(regs, CCSR_SSI_SACNT, CCSR_SSI_SACNT_RDWR_MASK,
CCSR_SSI_SACNT_WR);
udelay(100);
+
+ clk_disable_unprepare(fsl_ac97_data->clk);
}

static unsigned short fsl_ssi_ac97_read(struct snd_ac97 *ac97,
@@ -1151,6 +1160,14 @@ static unsigned short fsl_ssi_ac97_read(struct snd_ac97 *ac97,
unsigned short val = -1;
u32 reg_val;
unsigned int lreg;
+ int ret;
+
+ ret = clk_prepare_enable(fsl_ac97_data->clk);
+ if (ret) {
+ pr_err("ac97 read clk_prepare_enable failed: %d\n",
+ ret);
+ return -1;
+ }

lreg = (reg & 0x7f) << 12;
regmap_write(regs, CCSR_SSI_SACADD, lreg);
@@ -1162,6 +1179,8 @@ static unsigned short fsl_ssi_ac97_read(struct snd_ac97 *ac97,
regmap_read(regs, CCSR_SSI_SACDAT, &reg_val);
val = (reg_val >> 4) & 0xffff;

+ clk_disable_unprepare(fsl_ac97_data->clk);
+
return val;
}


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