ASoC: TWL4030: hands-free start-up sequence.

A special start-up sequence is required to reduce the pop-noise of Class D
amplifier when enable hands-free on TWL4030.

Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/soc/codecs/twl4030.h b/sound/soc/codecs/twl4030.h
index a2065d417c2e..54615c76802b 100644
--- a/sound/soc/codecs/twl4030.h
+++ b/sound/soc/codecs/twl4030.h
@@ -191,6 +191,12 @@
 #define TWL4030_RAMP_DELAY_2581MS       0x1C
 #define TWL4030_RAMP_EN                 0x02
 
+/* HFL_CTL (0x29, 0x2A) Fields */
+#define TWL4030_HF_CTL_HB_EN            0x04
+#define TWL4030_HF_CTL_LOOP_EN          0x08
+#define TWL4030_HF_CTL_RAMP_EN          0x10
+#define TWL4030_HF_CTL_REF_EN           0x20
+
 /* APLL_CTL (0x3A) Fields */
 
 #define TWL4030_APLL_EN                 0x10