diff options
| -rw-r--r-- | include/sound/sta32x.h | 1 | ||||
| -rw-r--r-- | sound/soc/codecs/sta32x.c | 50 |
2 files changed, 50 insertions, 1 deletions
diff --git a/include/sound/sta32x.h b/include/sound/sta32x.h index 45d7477c049b..8d93b0357a14 100644 --- a/include/sound/sta32x.h +++ b/include/sound/sta32x.h @@ -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 */ diff --git a/sound/soc/codecs/sta32x.c b/sound/soc/codecs/sta32x.c index 97091e3b9a0b..3b0deafd766b 100644 --- a/sound/soc/codecs/sta32x.c +++ b/sound/soc/codecs/sta32x.c @@ -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); |