[alsa-devel] [PATCH 09/10] ASoC: wm8974: Convert to snd_soc_cache_sync

[Axel Lin]

Convert to snd_soc_cache_sync for sync reg_cache with the hardware.

Signed-off-by: Axel Lin <axel.lin at gmail.com>
---
 sound/soc/codecs/wm8974.c |   29 ++++++++++++++++++-----------
 1 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c
index ca646a8..e25f0ad 100644
--- a/sound/soc/codecs/wm8974.c
+++ b/sound/soc/codecs/wm8974.c
@@ -46,6 +46,17 @@ static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
 	0x0000,
 };
 
+static int wm8974_volatile_register(struct snd_soc_codec *codec,
+				    unsigned int reg)
+{
+	switch (reg) {
+	case WM8974_RESET:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
 #define WM8974_POWER1_BIASEN  0x08
 #define WM8974_POWER1_BUFIOEN 0x04
 
@@ -517,6 +528,7 @@ static int wm8974_mute(struct snd_soc_dai *dai, int mute)
 static int wm8974_set_bias_level(struct snd_soc_codec *codec,
 	enum snd_soc_bias_level level)
 {
+	int ret;
 	u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;
 
 	switch (level) {
@@ -530,6 +542,11 @@ static int wm8974_set_bias_level(struct snd_soc_codec *codec,
 		power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;
 
 		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;
+			}
 			/* Initial cap charge at VMID 5k */
 			snd_soc_write(codec, WM8974_POWER1, power1 | 0x3);
 			mdelay(100);
@@ -589,18 +606,7 @@ static int wm8974_suspend(struct snd_soc_codec *codec, pm_message_t state)
 
 static int wm8974_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 < ARRAY_SIZE(wm8974_reg); i++) {
-		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
-		data[1] = cache[i] & 0x00ff;
-		codec->hw_write(codec->control_data, data, 2);
-	}
 	wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-
 	return 0;
 }
 
@@ -644,6 +650,7 @@ static struct snd_soc_codec_driver soc_codec_dev_wm8974 = {
 	.reg_cache_size = ARRAY_SIZE(wm8974_reg),
 	.reg_word_size = sizeof(u16),
 	.reg_cache_default = wm8974_reg,
+	.volatile_register = wm8974_volatile_register,
 };
 
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
-- 
1.7.4.1