From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Mon, 17 Nov 2008 17:11:14 +0000 (+0000)
Subject: ASoC: Manage VMID mode for WM8990
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2adb9833d1782262c20b21457d645163928cf2a2;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

ASoC: Manage VMID mode for WM8990

A small additional power saving can be achieved for the WM8990 by
maintaining VMID using a 2*250k divider when in standby mode.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/sound/soc/codecs/wm8990.c b/sound/soc/codecs/wm8990.c
index 938e1542920..2d7b0096d92 100644
--- a/sound/soc/codecs/wm8990.c
+++ b/sound/soc/codecs/wm8990.c
@@ -1222,8 +1222,14 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec,
 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		break;
+
 	case SND_SOC_BIAS_PREPARE:
+		/* VMID=2*50k */
+		val = wm8990_read_reg_cache(codec, WM8990_POWER_MANAGEMENT_1) &
+			~WM8990_VMID_MODE_MASK;
+		wm8990_write(codec, WM8990_POWER_MANAGEMENT_1, val | 0x2);
 		break;
+
 	case SND_SOC_BIAS_STANDBY:
 		if (codec->bias_level == SND_SOC_BIAS_OFF) {
 			/* Enable all output discharge bits */
@@ -1278,6 +1284,11 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec,
 			wm8990_write(codec, WM8990_EXT_CTL1, 0xa003);
 			wm8990_write(codec, WM8990_EXT_ACCESS_ENA, 0);
 		}
+
+		/* VMID=2*250k */
+		val = wm8990_read_reg_cache(codec, WM8990_POWER_MANAGEMENT_1) &
+			~WM8990_VMID_MODE_MASK;
+		wm8990_write(codec, WM8990_POWER_MANAGEMENT_1, val | 0x4);
 		break;
 
 	case SND_SOC_BIAS_OFF: