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ASoC: nau8825: Fix jack detection across suspend

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Jack plug status is rechecked at resume to handle plug/unplug
in S3 when the chip has no power.

Suspend/resume callbacks are moved from the i2c dev_pm_ops to
snd_soc_codec_driver. soc_resume_deferred is a delayed work
which may trigger nau8825_set_bias_level. The bias change races
against dev_pm_ops, causing jack detection issues.
soc_resume_deferred ensures bias change and snd_soc_codec_driver
suspend/resume are sequenced correctly.

Signed-off-by: Ben Zhang <benzh@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ben Zhang 2016-03-25 16:10:39 -07:00 committed by Mark Brown
parent f55532a0c0
commit e6cee90075
1 changed files with 71 additions and 55 deletions
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126
sound/soc/codecs/nau8825.c
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@ -343,9 +343,12 @@ static const struct snd_soc_dapm_widget nau8825_dapm_widgets[] = {
SND_SOC_DAPM_SUPPLY("ADC Power", NAU8825_REG_ANALOG_ADC_2, 6, 0, NULL,
0),
/* ADC for button press detection */
SND_SOC_DAPM_ADC("SAR", NULL, NAU8825_REG_SAR_CTRL,
NAU8825_SAR_ADC_EN_SFT, 0),
/* ADC for button press detection. A dapm supply widget is used to
* prevent dapm_power_widgets keeping the codec at SND_SOC_BIAS_ON
* during suspend.
*/
SND_SOC_DAPM_SUPPLY("SAR", NAU8825_REG_SAR_CTRL,
NAU8825_SAR_ADC_EN_SFT, 0, NULL, 0),
SND_SOC_DAPM_PGA_S("ADACL", 2, NAU8825_REG_RDAC, 12, 0, NULL, 0),
SND_SOC_DAPM_PGA_S("ADACR", 2, NAU8825_REG_RDAC, 13, 0, NULL, 0),
@ -607,6 +610,16 @@ static bool nau8825_is_jack_inserted(struct regmap *regmap)
static void nau8825_restart_jack_detection(struct regmap *regmap)
{
/* Chip needs one FSCLK cycle in order to generate interrupts,
* as we cannot guarantee one will be provided by the system. Turning
* master mode on then off enables us to generate that FSCLK cycle
* with a minimum of contention on the clock bus.
*/
regmap_update_bits(regmap, NAU8825_REG_I2S_PCM_CTRL2,
NAU8825_I2S_MS_MASK, NAU8825_I2S_MS_MASTER);
regmap_update_bits(regmap, NAU8825_REG_I2S_PCM_CTRL2,
NAU8825_I2S_MS_MASK, NAU8825_I2S_MS_SLAVE);
/* this will restart the entire jack detection process including MIC/GND
* switching and create interrupts. We have to go from 0 to 1 and back
* to 0 to restart.
@ -728,7 +741,10 @@ static irqreturn_t nau8825_interrupt(int irq, void *data)
struct regmap *regmap = nau8825->regmap;
int active_irq, clear_irq = 0, event = 0, event_mask = 0;
regmap_read(regmap, NAU8825_REG_IRQ_STATUS, &active_irq);
if (regmap_read(regmap, NAU8825_REG_IRQ_STATUS, &active_irq)) {
dev_err(nau8825->dev, "failed to read irq status\n");
return IRQ_NONE;
}
if ((active_irq & NAU8825_JACK_EJECTION_IRQ_MASK) ==
NAU8825_JACK_EJECTION_DETECTED) {
@ -1141,33 +1157,74 @@ static int nau8825_set_bias_level(struct snd_soc_codec *codec,
return ret;
}
}
ret = regcache_sync(nau8825->regmap);
if (ret) {
dev_err(codec->dev,
"Failed to sync cache: %d\n", ret);
return ret;
}
}
break;
case SND_SOC_BIAS_OFF:
if (nau8825->mclk_freq)
clk_disable_unprepare(nau8825->mclk);
regcache_mark_dirty(nau8825->regmap);
break;
}
return 0;
}
#ifdef CONFIG_PM
static int nau8825_suspend(struct snd_soc_codec *codec)
{
struct nau8825 *nau8825 = snd_soc_codec_get_drvdata(codec);
disable_irq(nau8825->irq);
regcache_cache_only(nau8825->regmap, true);
regcache_mark_dirty(nau8825->regmap);
return 0;
}
static int nau8825_resume(struct snd_soc_codec *codec)
{
struct nau8825 *nau8825 = snd_soc_codec_get_drvdata(codec);
/* The chip may lose power and reset in S3. regcache_sync restores
* register values including configurations for sysclk, irq, and
* jack/button detection.
*/
regcache_cache_only(nau8825->regmap, false);
regcache_sync(nau8825->regmap);
/* Check the jack plug status directly. If the headset is unplugged
* during S3 when the chip has no power, there will be no jack
* detection irq even after the nau8825_restart_jack_detection below,
* because the chip just thinks no headset has ever been plugged in.
*/
if (!nau8825_is_jack_inserted(nau8825->regmap)) {
nau8825_eject_jack(nau8825);
snd_soc_jack_report(nau8825->jack, 0, SND_JACK_HEADSET);
}
enable_irq(nau8825->irq);
/* Run jack detection to check the type (OMTP or CTIA) of the headset
* if there is one. This handles the case where a different type of
* headset is plugged in during S3. This triggers an IRQ iff a headset
* is already plugged in.
*/
nau8825_restart_jack_detection(nau8825->regmap);
return 0;
}
#else
#define nau8825_suspend NULL
#define nau8825_resume NULL
#endif
static struct snd_soc_codec_driver nau8825_codec_driver = {
.probe = nau8825_codec_probe,
.set_sysclk = nau8825_set_sysclk,
.set_pll = nau8825_set_pll,
.set_bias_level = nau8825_set_bias_level,
.suspend_bias_off = true,
.suspend = nau8825_suspend,
.resume = nau8825_resume,
.controls = nau8825_controls,
.num_controls = ARRAY_SIZE(nau8825_controls),
@ -1277,16 +1334,6 @@ static int nau8825_setup_irq(struct nau8825 *nau8825)
regmap_update_bits(regmap, NAU8825_REG_ENA_CTRL,
NAU8825_ENABLE_DACR, NAU8825_ENABLE_DACR);
/* Chip needs one FSCLK cycle in order to generate interrupts,
* as we cannot guarantee one will be provided by the system. Turning
* master mode on then off enables us to generate that FSCLK cycle
* with a minimum of contention on the clock bus.
*/
regmap_update_bits(regmap, NAU8825_REG_I2S_PCM_CTRL2,
NAU8825_I2S_MS_MASK, NAU8825_I2S_MS_MASTER);
regmap_update_bits(regmap, NAU8825_REG_I2S_PCM_CTRL2,
NAU8825_I2S_MS_MASK, NAU8825_I2S_MS_SLAVE);
ret = devm_request_threaded_irq(nau8825->dev, nau8825->irq, NULL,
nau8825_interrupt, IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"nau8825", nau8825);
@ -1354,36 +1401,6 @@ static int nau8825_i2c_remove(struct i2c_client *client)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int nau8825_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct nau8825 *nau8825 = dev_get_drvdata(dev);
disable_irq(client->irq);
regcache_cache_only(nau8825->regmap, true);
regcache_mark_dirty(nau8825->regmap);
return 0;
}
static int nau8825_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct nau8825 *nau8825 = dev_get_drvdata(dev);
regcache_cache_only(nau8825->regmap, false);
regcache_sync(nau8825->regmap);
enable_irq(client->irq);
return 0;
}
#endif
static const struct dev_pm_ops nau8825_pm = {
SET_SYSTEM_SLEEP_PM_OPS(nau8825_suspend, nau8825_resume)
};
static const struct i2c_device_id nau8825_i2c_ids[] = {
{ "nau8825", 0 },
{ }
@ -1410,7 +1427,6 @@ static struct i2c_driver nau8825_driver = {
.name = "nau8825",
.of_match_table = of_match_ptr(nau8825_of_ids),
.acpi_match_table = ACPI_PTR(nau8825_acpi_match),
.pm = &nau8825_pm,
},
.probe = nau8825_i2c_probe,
.remove = nau8825_i2c_remove,