ASoC: TWL4030: Add EXTMUTE to reduce pop-noise effect

According to TRM, an external FET controlled by a 1.8V output signal
can be used to reduce the pop-noise heard when the audio amplifier is
switched on. It is suggested that GPIO6 of TWL4030 be used, but any
other gpio can be used instead. This is indicated in machine driver
with the following twl4030_setup_data members:

-hs_extmute. Set to 1 if board has support for EXTMUTE.

-set_hs_extmute. Set to a callback funcion to control an external gpio
line. Set to NULL if MUTE[GPIO6] pin is used.

Codec driver takes care of enabling and disabling this output during
the headset pop attenuation sequence.

Also add a delay to let VMID settle in ramp up sequence.

Signed-off-by: Jorge Eduardo Candelaria <x0107209@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index 49ceb620678..6da94cadd15 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -620,6 +620,9 @@ static int handsfreerpga_event(struct snd_soc_dapm_widget *w,
 
 static void headset_ramp(struct snd_soc_codec *codec, int ramp)
 {
+        struct snd_soc_device *socdev = codec->socdev;
+        struct twl4030_setup_data *setup = socdev->codec_data;
+
         unsigned char hs_gain, hs_pop;
         struct twl4030_priv *twl4030 = codec->private_data;
         /* Base values for ramp delay calculation: 2^19 - 2^26 */
@@ -629,6 +632,17 @@ static void headset_ramp(struct snd_soc_codec *codec, int ramp)
         hs_gain = twl4030_read_reg_cache(codec, TWL4030_REG_HS_GAIN_SET);
         hs_pop = twl4030_read_reg_cache(codec, TWL4030_REG_HS_POPN_SET);
 
+        /* Enable external mute control, this dramatically reduces
+         * the pop-noise */
+        if (setup && setup->hs_extmute) {
+                if (setup->set_hs_extmute) {
+                        setup->set_hs_extmute(1);
+                } else {
+                        hs_pop |= TWL4030_EXTMUTE;
+                        twl4030_write(codec, TWL4030_REG_HS_POPN_SET, hs_pop);
+                }
+        }
+
         if (ramp) {
                 /* Headset ramp-up according to the TRM */
                 hs_pop |= TWL4030_VMID_EN;
@@ -636,6 +650,9 @@ static void headset_ramp(struct snd_soc_codec *codec, int ramp)
                 twl4030_write(codec, TWL4030_REG_HS_GAIN_SET, hs_gain);
                 hs_pop |= TWL4030_RAMP_EN;
                 twl4030_write(codec, TWL4030_REG_HS_POPN_SET, hs_pop);
+                /* Wait ramp delay time + 1, so the VMID can settle */
+                mdelay((ramp_base[(hs_pop & TWL4030_RAMP_DELAY) >> 2] /
+                        twl4030->sysclk) + 1);
         } else {
                 /* Headset ramp-down _not_ according to
                  * the TRM, but in a way that it is working */
@@ -652,6 +669,16 @@ static void headset_ramp(struct snd_soc_codec *codec, int ramp)
                 hs_pop &= ~TWL4030_VMID_EN;
                 twl4030_write(codec, TWL4030_REG_HS_POPN_SET, hs_pop);
         }
+
+        /* Disable external mute */
+        if (setup && setup->hs_extmute) {
+                if (setup->set_hs_extmute) {
+                        setup->set_hs_extmute(0);
+                } else {
+                        hs_pop &= ~TWL4030_EXTMUTE;
+                        twl4030_write(codec, TWL4030_REG_HS_POPN_SET, hs_pop);
+                }
+        }
 }
 
 static int headsetlpga_event(struct snd_soc_dapm_widget *w,