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Subject[PATCH 10/10] ASoC: wm8988: Convert to snd_soc_cache_sync
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Convert to snd_soc_cache_sync for sync reg_cache with the hardware.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
sound/soc/codecs/wm8988.c | 32 ++++++++++++++++++--------------
1 files changed, 18 insertions(+), 14 deletions(-)
diff --git a/sound/soc/codecs/wm8988.c b/sound/soc/codecs/wm8988.c
index 1c6f8bf..ed453e5 100644
--- a/sound/soc/codecs/wm8988.c
+++ b/sound/soc/codecs/wm8988.c
@@ -55,6 +55,16 @@ struct wm8988_priv {
struct snd_pcm_hw_constraint_list *sysclk_constraints;
};

+static int wm8988_volatile_register(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ switch (reg) {
+ case WM8988_RESET:
+ return 1;
+ default:
+ return 0;
+ }
+}

#define wm8988_reset(c) snd_soc_write(c, WM8988_RESET, 0)

@@ -663,6 +673,7 @@ static int wm8988_mute(struct snd_soc_dai *dai, int mute)
static int wm8988_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
+ int ret;
u16 pwr_reg = snd_soc_read(codec, WM8988_PWR1) & ~0x1c1;

switch (level) {
@@ -676,6 +687,12 @@ static int wm8988_set_bias_level(struct snd_soc_codec *codec,

case SND_SOC_BIAS_STANDBY:
if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+ ret = snd_soc_cache_sync(codec);
+ if (ret < 0) {
+ dev_err(codec->dev, "Failed to sync cache: %d\n", ret);
+ return ret;
+ }
+
/* VREF, VMID=2x5k */
snd_soc_write(codec, WM8988_PWR1, pwr_reg | 0x1c1);

@@ -736,21 +753,7 @@ static int wm8988_suspend(struct snd_soc_codec *codec, pm_message_t state)

static int wm8988_resume(struct snd_soc_codec *codec)
{
- int i;
- u8 data[2];
- u16 *cache = codec->reg_cache;
-
- /* Sync reg_cache with the hardware */
- for (i = 0; i < WM8988_NUM_REG; i++) {
- if (i == WM8988_RESET)
- continue;
- data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
- data[1] = cache[i] & 0x00ff;
- codec->hw_write(codec->control_data, data, 2);
- }
-
wm8988_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-
return 0;
}

@@ -805,6 +808,7 @@ static struct snd_soc_codec_driver soc_codec_dev_wm8988 = {
.reg_cache_size = ARRAY_SIZE(wm8988_reg),
.reg_word_size = sizeof(u16),
.reg_cache_default = wm8988_reg,
+ .volatile_register = wm8988_volatile_register,
};

#if defined(CONFIG_SPI_MASTER)
--
1.7.4.1




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