[PATCH v2 3/3] ASoC: cs42l42: Handle system suspend
From: Richard Fitzgerald
Date: Fri Jan 21 2022 - 07:04:29 EST
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@xxxxxxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/cs42l42.c | 141 +++++++++++++++++++++++++++++++++++++++++++++
sound/soc/codecs/cs42l42.h | 5 ++
2 files changed, 146 insertions(+)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index f1b95d45af4a..db6ef6cdce15 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -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, ®);
+ 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),
},
diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index 53d96287abba..244b24d1f5e9 100644
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -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__ */
--
2.11.0