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ASoC: sta32x: add workaround for ESD reset issue

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sta32x resets and loses all configuration during ESD test.
Work around by polling the CONFA register once a second
and restore all coeffcients and registers when CONFA
changes unexpectedly.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Johannes Stezenbach 2011-11-14 17:23:18 +01:00 committed by Mark Brown
parent e012ba2491
commit 3fb5eac50d
2 changed files with 50 additions and 1 deletions
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1
include/sound/sta32x.h
View File

@ -29,6 +29,7 @@ struct sta32x_platform_data {
int ch2_output_mapping;
int ch3_output_mapping;
int thermal_conf;
int needs_esd_watchdog;
};
#endif /* __LINUX_SND__STA32X_H */

50
sound/soc/codecs/sta32x.c
View File

@ -27,6 +27,7 @@
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@ -80,6 +81,8 @@ struct sta32x_priv {
unsigned int format;
u32 coef_shadow[STA32X_COEF_COUNT];
struct delayed_work watchdog_work;
int shutdown;
};
static const DECLARE_TLV_DB_SCALE(mvol_tlv, -12700, 50, 1);
@ -304,6 +307,46 @@ int sta32x_cache_sync(struct snd_soc_codec *codec)
return rc;
}
/* work around ESD issue where sta32x resets and loses all configuration */
static void sta32x_watchdog(struct work_struct *work)
{
struct sta32x_priv *sta32x = container_of(work, struct sta32x_priv,
watchdog_work.work);
struct snd_soc_codec *codec = sta32x->codec;
unsigned int confa, confa_cached;
/* check if sta32x has reset itself */
confa_cached = snd_soc_read(codec, STA32X_CONFA);
codec->cache_bypass = 1;
confa = snd_soc_read(codec, STA32X_CONFA);
codec->cache_bypass = 0;
if (confa != confa_cached) {
codec->cache_sync = 1;
sta32x_cache_sync(codec);
}
if (!sta32x->shutdown)
schedule_delayed_work(&sta32x->watchdog_work,
round_jiffies_relative(HZ));
}
static void sta32x_watchdog_start(struct sta32x_priv *sta32x)
{
if (sta32x->pdata->needs_esd_watchdog) {
sta32x->shutdown = 0;
schedule_delayed_work(&sta32x->watchdog_work,
round_jiffies_relative(HZ));
}
}
static void sta32x_watchdog_stop(struct sta32x_priv *sta32x)
{
if (sta32x->pdata->needs_esd_watchdog) {
sta32x->shutdown = 1;
cancel_delayed_work_sync(&sta32x->watchdog_work);
}
}
#define SINGLE_COEF(xname, index) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
.info = sta32x_coefficient_info, \
@ -714,6 +757,7 @@ static int sta32x_set_bias_level(struct snd_soc_codec *codec,
}
sta32x_cache_sync(codec);
sta32x_watchdog_start(sta32x);
}
/* Power up to mute */
@ -730,7 +774,7 @@ static int sta32x_set_bias_level(struct snd_soc_codec *codec,
STA32X_CONFF_PWDN | STA32X_CONFF_EAPD,
STA32X_CONFF_PWDN);
msleep(300);
sta32x_watchdog_stop(sta32x);
regulator_bulk_disable(ARRAY_SIZE(sta32x->supplies),
sta32x->supplies);
break;
@ -863,6 +907,9 @@ static int sta32x_probe(struct snd_soc_codec *codec)
sta32x->coef_shadow[60] = 0x400000;
sta32x->coef_shadow[61] = 0x400000;
if (sta32x->pdata->needs_esd_watchdog)
INIT_DELAYED_WORK(&sta32x->watchdog_work, sta32x_watchdog);
sta32x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
/* Bias level configuration will have done an extra enable */
regulator_bulk_disable(ARRAY_SIZE(sta32x->supplies), sta32x->supplies);
@ -879,6 +926,7 @@ static int sta32x_remove(struct snd_soc_codec *codec)
{
struct sta32x_priv *sta32x = snd_soc_codec_get_drvdata(codec);
sta32x_watchdog_stop(sta32x);
sta32x_set_bias_level(codec, SND_SOC_BIAS_OFF);
regulator_bulk_disable(ARRAY_SIZE(sta32x->supplies), sta32x->supplies);
regulator_bulk_free(ARRAY_SIZE(sta32x->supplies), sta32x->supplies);