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ASoC: tas5086: fix Mid-Z implementation 

It turns out that the TAS5086 doesn't like channel start parts to be
empty, and if all channels are configured to Mid-Z, part 1 has to be
used.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Daniel Mack 2013-06-27 21:59:11 +02:00 committed by Mark Brown
parent 9f24dc8770
commit a975873a9a
1 changed files with 9 additions and 6 deletions
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13
sound/soc/codecs/tas5086.c
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@ -721,7 +721,7 @@ static int tas5086_probe(struct snd_soc_codec *codec)
{
struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
int charge_period = 1300000; /* hardware default is 1300 ms */
u8 pwm_start = TAS5086_PWM_START_CHANNEL_MASK;
u8 pwm_start_mid_z = 0;
int i, ret;
if (of_match_device(of_match_ptr(tas5086_dt_ids), codec->dev)) {
@ -735,16 +735,19 @@ static int tas5086_probe(struct snd_soc_codec *codec)
"ti,mid-z-channel-%d", i + 1);
if (of_get_property(of_node, name, NULL) != NULL)
pwm_start &= ~(1 << i);
pwm_start_mid_z |= 1 << i;
}
}
/*
* Configure 'part 2' of the PWM starts to always use MID-Z, and tell
* all configured mid-z channels to start start under 'part 2'.
* If any of the channels is configured to start in Mid-Z mode,
* configure 'part 1' of the PWM starts to use Mid-Z, and tell
* all configured mid-z channels to start start under 'part 1'.
*/
if (pwm_start_mid_z)
regmap_write(priv->regmap, TAS5086_PWM_START,
TAS5086_PWM_START_MIDZ_FOR_START_2 | pwm_start);
TAS5086_PWM_START_MIDZ_FOR_START_1 |
pwm_start_mid_z);
/* lookup and set split-capacitor charge period */
if (charge_period == 0) {