Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 49d92c7d authored by Stanley.Miao's avatar Stanley.Miao Committed by Mark Brown
Browse files

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: default avatarStanley.Miao <stanley.miao@windriver.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 4544f8a2

sound/soc/codecs/twl4030.c

+30 −4
Original line number Diff line number Diff line
@@ -322,6 +322,30 @@ static int outmixer_event(struct snd_soc_dapm_widget *w, 
	return ret;

}



static int handsfree_event(struct snd_soc_dapm_widget *w,

		struct snd_kcontrol *kcontrol, int event)

{

	struct soc_enum *e = (struct soc_enum *)w->kcontrols->private_value;

	unsigned char hs_ctl;



	hs_ctl = twl4030_read_reg_cache(w->codec, e->reg);



	if (hs_ctl & TWL4030_HF_CTL_REF_EN) {

		hs_ctl |= TWL4030_HF_CTL_RAMP_EN;

		twl4030_write(w->codec, e->reg, hs_ctl);

		hs_ctl |= TWL4030_HF_CTL_LOOP_EN;

		twl4030_write(w->codec, e->reg, hs_ctl);

		hs_ctl |= TWL4030_HF_CTL_HB_EN;

		twl4030_write(w->codec, e->reg, hs_ctl);

	} else {

		hs_ctl &= ~(TWL4030_HF_CTL_RAMP_EN | TWL4030_HF_CTL_LOOP_EN

				| TWL4030_HF_CTL_HB_EN);

		twl4030_write(w->codec, e->reg, hs_ctl);

	}



	return 0;

}



/*

 * Some of the gain controls in TWL (mostly those which are associated with

 * the outputs) are implemented in an interesting way:
@@ -806,10 +830,12 @@ static const struct snd_soc_dapm_widget twl4030_dapm_widgets[] = { 
	SND_SOC_DAPM_MUX("CarkitR Mux", SND_SOC_NOPM, 0, 0,

		&twl4030_dapm_carkitr_control),

	/* HandsfreeL/R */

	SND_SOC_DAPM_MUX("HandsfreeL Mux", TWL4030_REG_HFL_CTL, 5, 0,

		&twl4030_dapm_handsfreel_control),

	SND_SOC_DAPM_MUX("HandsfreeR Mux", TWL4030_REG_HFR_CTL, 5, 0,

		&twl4030_dapm_handsfreer_control),

	SND_SOC_DAPM_MUX_E("HandsfreeL Mux", TWL4030_REG_HFL_CTL, 5, 0,

		&twl4030_dapm_handsfreel_control, handsfree_event,

		SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),

	SND_SOC_DAPM_MUX_E("HandsfreeR Mux", TWL4030_REG_HFR_CTL, 5, 0,

		&twl4030_dapm_handsfreer_control, handsfree_event,

		SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),



	SND_SOC_DAPM_ADC("ADCL", "Left Capture", SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_ADC("ADCR", "Right Capture", SND_SOC_NOPM, 0, 0),

sound/soc/codecs/twl4030.h

+6 −0
Original line number Diff line number Diff line
@@ -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