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ASoC: cs42l42: Handle system suspend

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Add system suspend functions to handle clean power-down on suspend and
restoring registers on resume.

The jack state could change during suspend. Plug->unplug and unplug->plug
are straightforward because this looks no different from any other plug
state change - there will be a plugged or unplugged interrupt pending.
The jack could be unplugged and a different type of jack plugged, and on
resume the plug state would not have changed. Setting plug_state back to
TS_TRANS (transitioning) will make the next plug interrupt after resume
run a type detection.

During system suspend any jack plug/unplug and button events will not be
reported or generate a system wakeup. If the plug state or headset type
has changed it will be reported after resume.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220121120412.672284-4-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Richard Fitzgerald 2022-01-21 12:04:12 +00:00 committed by Mark Brown
parent 5982b5a8ec
commit f8593e8854
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 146 additions and 0 deletions
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141
sound/soc/codecs/cs42l42.c
View File

@ -1614,6 +1614,10 @@ static irqreturn_t cs42l42_irq_thread(int irq, void *data)
int report = 0;
mutex_lock(&cs42l42->irq_lock);
if (cs42l42->suspended) {
mutex_unlock(&cs42l42->irq_lock);
return IRQ_NONE;
}
/* Read sticky registers to clear interurpt */
for (i = 0; i < ARRAY_SIZE(stickies); i++) {
@ -2047,6 +2051,138 @@ static int cs42l42_handle_device_data(struct device *dev,
return 0;
}
/* Datasheet suspend sequence */
static const struct reg_sequence __maybe_unused cs42l42_shutdown_seq[] = {
REG_SEQ0(CS42L42_MIC_DET_CTL1, 0x9F),
REG_SEQ0(CS42L42_ADC_OVFL_INT_MASK, 0x01),
REG_SEQ0(CS42L42_MIXER_INT_MASK, 0x0F),
REG_SEQ0(CS42L42_SRC_INT_MASK, 0x0F),
REG_SEQ0(CS42L42_ASP_RX_INT_MASK, 0x1F),
REG_SEQ0(CS42L42_ASP_TX_INT_MASK, 0x0F),
REG_SEQ0(CS42L42_CODEC_INT_MASK, 0x03),
REG_SEQ0(CS42L42_SRCPL_INT_MASK, 0x7F),
REG_SEQ0(CS42L42_VPMON_INT_MASK, 0x01),
REG_SEQ0(CS42L42_PLL_LOCK_INT_MASK, 0x01),
REG_SEQ0(CS42L42_TSRS_PLUG_INT_MASK, 0x0F),
REG_SEQ0(CS42L42_WAKE_CTL, 0xE1),
REG_SEQ0(CS42L42_DET_INT1_MASK, 0xE0),
REG_SEQ0(CS42L42_DET_INT2_MASK, 0xFF),
REG_SEQ0(CS42L42_MIXER_CHA_VOL, 0x3F),
REG_SEQ0(CS42L42_MIXER_ADC_VOL, 0x3F),
REG_SEQ0(CS42L42_MIXER_CHB_VOL, 0x3F),
REG_SEQ0(CS42L42_HP_CTL, 0x0F),
REG_SEQ0(CS42L42_ASP_RX_DAI0_EN, 0x00),
REG_SEQ0(CS42L42_ASP_CLK_CFG, 0x00),
REG_SEQ0(CS42L42_HSDET_CTL2, 0x00),
REG_SEQ0(CS42L42_PWR_CTL1, 0xFE),
REG_SEQ0(CS42L42_PWR_CTL2, 0x8C),
REG_SEQ0(CS42L42_DAC_CTL2, 0x02),
REG_SEQ0(CS42L42_HS_CLAMP_DISABLE, 0x00),
REG_SEQ0(CS42L42_MISC_DET_CTL, 0x03),
REG_SEQ0(CS42L42_TIPSENSE_CTL, 0x02),
REG_SEQ0(CS42L42_HSBIAS_SC_AUTOCTL, 0x03),
REG_SEQ0(CS42L42_PWR_CTL1, 0xFF)
};
static int __maybe_unused cs42l42_suspend(struct device *dev)
{
struct cs42l42_private *cs42l42 = dev_get_drvdata(dev);
unsigned int reg;
u8 save_regs[ARRAY_SIZE(cs42l42_shutdown_seq)];
int i, ret;
/*
* Wait for threaded irq handler to be idle and stop it processing
* future interrupts. This ensures a safe disable if the interrupt
* is shared.
*/
mutex_lock(&cs42l42->irq_lock);
cs42l42->suspended = true;
/* Save register values that will be overwritten by shutdown sequence */
for (i = 0; i < ARRAY_SIZE(cs42l42_shutdown_seq); ++i) {
regmap_read(cs42l42->regmap, cs42l42_shutdown_seq[i].reg, &reg);
save_regs[i] = (u8)reg;
}
/* Shutdown codec */
regmap_multi_reg_write(cs42l42->regmap,
cs42l42_shutdown_seq,
ARRAY_SIZE(cs42l42_shutdown_seq));
/* All interrupt sources are now disabled */
mutex_unlock(&cs42l42->irq_lock);
/* Wait for power-down complete */
msleep(CS42L42_PDN_DONE_TIME_MS);
ret = regmap_read_poll_timeout(cs42l42->regmap,
CS42L42_CODEC_STATUS, reg,
(reg & CS42L42_PDN_DONE_MASK),
CS42L42_PDN_DONE_POLL_US,
CS42L42_PDN_DONE_TIMEOUT_US);
if (ret)
dev_warn(dev, "Failed to get PDN_DONE: %d\n", ret);
/* Discharge FILT+ */
regmap_update_bits(cs42l42->regmap, CS42L42_PWR_CTL2,
CS42L42_DISCHARGE_FILT_MASK, CS42L42_DISCHARGE_FILT_MASK);
msleep(CS42L42_FILT_DISCHARGE_TIME_MS);
regcache_cache_only(cs42l42->regmap, true);
gpiod_set_value_cansleep(cs42l42->reset_gpio, 0);
regulator_bulk_disable(ARRAY_SIZE(cs42l42->supplies), cs42l42->supplies);
/* Restore register values to the regmap cache */
for (i = 0; i < ARRAY_SIZE(cs42l42_shutdown_seq); ++i)
regmap_write(cs42l42->regmap, cs42l42_shutdown_seq[i].reg, save_regs[i]);
/* The cached address page register value is now stale */
regcache_drop_region(cs42l42->regmap, CS42L42_PAGE_REGISTER, CS42L42_PAGE_REGISTER);
dev_dbg(dev, "System suspended\n");
return 0;
}
static int __maybe_unused cs42l42_resume(struct device *dev)
{
struct cs42l42_private *cs42l42 = dev_get_drvdata(dev);
int ret;
/*
* If jack was unplugged and re-plugged during suspend it could
* have changed type but the tip-sense state hasn't changed.
* Force a plugged state to be re-evaluated.
*/
if (cs42l42->plug_state != CS42L42_TS_UNPLUG)
cs42l42->plug_state = CS42L42_TS_TRANS;
ret = regulator_bulk_enable(ARRAY_SIZE(cs42l42->supplies), cs42l42->supplies);
if (ret != 0) {
dev_err(dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
gpiod_set_value_cansleep(cs42l42->reset_gpio, 1);
usleep_range(CS42L42_BOOT_TIME_US, CS42L42_BOOT_TIME_US * 2);
regcache_cache_only(cs42l42->regmap, false);
regcache_mark_dirty(cs42l42->regmap);
mutex_lock(&cs42l42->irq_lock);
/* Sync LATCH_TO_VP first so the VP domain registers sync correctly */
regcache_sync_region(cs42l42->regmap, CS42L42_MIC_DET_CTL1, CS42L42_MIC_DET_CTL1);
regcache_sync(cs42l42->regmap);
cs42l42->suspended = false;
mutex_unlock(&cs42l42->irq_lock);
dev_dbg(dev, "System resumed\n");
return 0;
}
static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
const struct i2c_device_id *id)
{
@ -2217,6 +2353,10 @@ static int cs42l42_i2c_remove(struct i2c_client *i2c_client)
return 0;
}
static const struct dev_pm_ops cs42l42_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(cs42l42_suspend, cs42l42_resume)
};
#ifdef CONFIG_OF
static const struct of_device_id cs42l42_of_match[] = {
{ .compatible = "cirrus,cs42l42", },
@ -2243,6 +2383,7 @@ MODULE_DEVICE_TABLE(i2c, cs42l42_id);
static struct i2c_driver cs42l42_i2c_driver = {
.driver = {
.name = "cs42l42",
.pm = &cs42l42_pm_ops,
.of_match_table = of_match_ptr(cs42l42_of_match),
.acpi_match_table = ACPI_PTR(cs42l42_acpi_match),
},

5
sound/soc/codecs/cs42l42.h
View File

@ -826,6 +826,10 @@
#define CS42L42_PLL_LOCK_POLL_US 250
#define CS42L42_PLL_LOCK_TIMEOUT_US 1250
#define CS42L42_HP_ADC_EN_TIME_US 20000
#define CS42L42_PDN_DONE_POLL_US 1000
#define CS42L42_PDN_DONE_TIMEOUT_US 200000
#define CS42L42_PDN_DONE_TIME_MS 100
#define CS42L42_FILT_DISCHARGE_TIME_MS 46
static const char *const cs42l42_supply_names[CS42L42_NUM_SUPPLIES] = {
"VA",
@ -860,6 +864,7 @@ struct cs42l42_private {
u8 hs_bias_sense_en;
u8 stream_use;
bool hp_adc_up_pending;
bool suspended;
};
#endif /* __CS42L42_H__ */