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Commit df1ef7a3 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Refresh WM8974 bias configuration 



Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 372a14a4

sound/soc/codecs/wm8974.c

+23 −7
Original line number Diff line number Diff line
@@ -46,6 +46,9 @@ static const u16 wm8974_reg[WM8974_CACHEREGNUM] = { 
	0x0000,

};



#define WM8974_POWER1_BIASEN  0x08

#define WM8974_POWER1_BUFIOEN 0x10



struct wm8974_priv {

	struct snd_soc_codec codec;

	u16 reg_cache[WM8974_CACHEREGNUM];
@@ -528,22 +531,35 @@ 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)

{

	u16 power1 = wm8974_read_reg_cache(codec, WM8974_POWER1) & ~0x3;



	switch (level) {

	case SND_SOC_BIAS_ON:

		wm8974_write(codec, WM8974_POWER1, 0x1ff);

		wm8974_write(codec, WM8974_POWER2, 0x1ff);

		wm8974_write(codec, WM8974_POWER3, 0x1ff);

		break;

	case SND_SOC_BIAS_PREPARE:

		power1 |= 0x1;  /* VMID 50k */

		wm8974_write(codec, WM8974_POWER1, power1);

		break;



	case SND_SOC_BIAS_STANDBY:

		power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;



		if (codec->bias_level == SND_SOC_BIAS_OFF) {

			/* Initial cap charge at VMID 5k */

			wm8974_write(codec, WM8974_POWER1, power1 | 0x3);

			mdelay(100);

		}



		power1 |= 0x2;  /* VMID 500k */

		wm8974_write(codec, WM8974_POWER1, power1);

		break;



	case SND_SOC_BIAS_OFF:

		wm8974_write(codec, WM8974_POWER1, 0x0);

		wm8974_write(codec, WM8974_POWER2, 0x0);

		wm8974_write(codec, WM8974_POWER3, 0x0);

		wm8974_write(codec, WM8974_POWER1, 0);

		wm8974_write(codec, WM8974_POWER2, 0);

		wm8974_write(codec, WM8974_POWER3, 0);

		break;

	}



	codec->bias_level = level;

	return 0;

}