* [PATCH 2/3] ASoC: cs42l42: Change jack_detect_mutex to a lock of all IRQ handling
2022-01-20 17:55 [PATCH 0/3] ASOC: cs42l42: Add support for system suspend Richard Fitzgerald
2022-01-20 17:55 ` [PATCH 1/3] ASoC: cs42l42: Report full jack status when plug is detected Richard Fitzgerald
@ 2022-01-20 17:55 ` Richard Fitzgerald
2022-01-20 17:55 ` [PATCH 3/3] ASoC: cs42l42: Handle system suspend Richard Fitzgerald
2 siblings, 0 replies; 5+ messages in thread
From: Richard Fitzgerald @ 2022-01-20 17:55 UTC (permalink / raw)
To: broonie; +Cc: alsa-devel, linux-kernel, patches, Richard Fitzgerald
Rename jack_detect_mutex to irq_lock and make it lock the entire IRQ
handling.
The jack_detect_mutex was introduced to synchronize registering an
ALSA jack handler, via cs42l42_set_jack(), with the jack state
processing in the IRQ handler, and was taken only around the
relevant part of the IRQ handling code.
System suspend will need to synchronize with the IRQ handler thread
so will need a similar mutex that surrounds all of the IRQ handling.
Repurposing the existing jack_detect_mutex is the simplest option.
It does no harm for a call to cs42l42_set_jack() to additionally
block the first few lines of IRQ handling, and the only interrupts
used by the driver are all for jack handling.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
sound/soc/codecs/cs42l42.c | 11 +++++------
sound/soc/codecs/cs42l42.h | 2 +-
2 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 2c294868008e..f1b95d45af4a 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -550,7 +550,7 @@ static int cs42l42_set_jack(struct snd_soc_component *component, struct snd_soc_
struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component);
/* Prevent race with interrupt handler */
- mutex_lock(&cs42l42->jack_detect_mutex);
+ mutex_lock(&cs42l42->irq_lock);
cs42l42->jack = jk;
if (jk) {
@@ -566,7 +566,7 @@ static int cs42l42_set_jack(struct snd_soc_component *component, struct snd_soc_
break;
}
}
- mutex_unlock(&cs42l42->jack_detect_mutex);
+ mutex_unlock(&cs42l42->irq_lock);
return 0;
}
@@ -1613,6 +1613,7 @@ static irqreturn_t cs42l42_irq_thread(int irq, void *data)
unsigned int i;
int report = 0;
+ mutex_lock(&cs42l42->irq_lock);
/* Read sticky registers to clear interurpt */
for (i = 0; i < ARRAY_SIZE(stickies); i++) {
@@ -1635,8 +1636,6 @@ static irqreturn_t cs42l42_irq_thread(int irq, void *data)
CS42L42_M_DETECT_FT_MASK |
CS42L42_M_HSBIAS_HIZ_MASK);
- mutex_lock(&cs42l42->jack_detect_mutex);
-
/*
* Check auto-detect status. Don't assume a previous unplug event has
* cleared the flags. If the jack is unplugged and plugged during
@@ -1713,7 +1712,7 @@ static irqreturn_t cs42l42_irq_thread(int irq, void *data)
}
}
- mutex_unlock(&cs42l42->jack_detect_mutex);
+ mutex_unlock(&cs42l42->irq_lock);
return IRQ_HANDLED;
}
@@ -2062,7 +2061,7 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
cs42l42->dev = &i2c_client->dev;
i2c_set_clientdata(i2c_client, cs42l42);
- mutex_init(&cs42l42->jack_detect_mutex);
+ mutex_init(&cs42l42->irq_lock);
cs42l42->regmap = devm_regmap_init_i2c(i2c_client, &cs42l42_regmap);
if (IS_ERR(cs42l42->regmap)) {
diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index 9fff183dce8e..53d96287abba 100644
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -842,7 +842,7 @@ struct cs42l42_private {
struct gpio_desc *reset_gpio;
struct completion pdn_done;
struct snd_soc_jack *jack;
- struct mutex jack_detect_mutex;
+ struct mutex irq_lock;
int pll_config;
int bclk;
u32 sclk;
--
2.11.0
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH 3/3] ASoC: cs42l42: Handle system suspend
2022-01-20 17:55 [PATCH 0/3] ASOC: cs42l42: Add support for system suspend Richard Fitzgerald
2022-01-20 17:55 ` [PATCH 1/3] ASoC: cs42l42: Report full jack status when plug is detected Richard Fitzgerald
2022-01-20 17:55 ` [PATCH 2/3] ASoC: cs42l42: Change jack_detect_mutex to a lock of all IRQ handling Richard Fitzgerald
@ 2022-01-20 17:55 ` Richard Fitzgerald
2022-01-21 10:22 ` Richard Fitzgerald
2 siblings, 1 reply; 5+ messages in thread
From: Richard Fitzgerald @ 2022-01-20 17:55 UTC (permalink / raw)
To: broonie; +Cc: alsa-devel, linux-kernel, patches, Richard Fitzgerald
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>
---
sound/soc/codecs/cs42l42.c | 139 +++++++++++++++++++++++++++++++++++++++++++++
sound/soc/codecs/cs42l42.h | 5 ++
2 files changed, 144 insertions(+)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index f1b95d45af4a..f577b39a2fc0 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 +2051,136 @@ 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);
+
+ /* 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;
+
+ 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 +2351,10 @@ 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 +2381,7 @@ 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
^ permalink raw reply [flat|nested] 5+ messages in thread