Unverified Commit f8593e88 authored by Richard Fitzgerald's avatar Richard Fitzgerald Committed by Mark Brown
Browse files

ASoC: cs42l42: Handle system suspend 



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: default avatarRichard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220121120412.672284-4-rf@opensource.cirrus.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 5982b5a8

sound/soc/codecs/cs42l42.c

+141 −0
Original line number Diff line number Diff line
@@ -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),

		},

sound/soc/codecs/cs42l42.h

+5 −0
Original line number Diff line number Diff line
@@ -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__ */