ALSA: hda: cs35l41: Support Hibernation during Suspend

CS35L41 supports hibernation during suspend when using
DSP firmware.
When the driver suspends it will hibernate the part, if
firmware is running, and resume will wake from hibernation.
CS35L41 driver will suspend/resume when requested by
hda driver.
Note that suspend/resume and hibernation is only supported
when firmware is running.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220630002335.366545-10-vitalyr@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

6 files changed, 136 insertions, 4 deletions

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index d5d2323cc8c7..61441bfc9fa9 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <sound/hda_codec.h>
 #include <sound/soc.h>
+#include <linux/pm_runtime.h>
 #include "hda_local.h"
 #include "hda_auto_parser.h"
 #include "hda_jack.h"
@@ -435,6 +436,75 @@ static int cs35l41_hda_channel_map(struct device *dev, unsigned int tx_num, unsi
 				    rx_slot);
 }
 
+static int cs35l41_runtime_suspend(struct device *dev)
+{
+	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
+
+	dev_dbg(cs35l41->dev, "Suspend\n");
+
+	if (!cs35l41->firmware_running)
+		return 0;
+
+	if (cs35l41_enter_hibernate(cs35l41->dev, cs35l41->regmap, cs35l41->hw_cfg.bst_type) < 0)
+		return 0;
+
+	regcache_cache_only(cs35l41->regmap, true);
+	regcache_mark_dirty(cs35l41->regmap);
+
+	return 0;
+}
+
+static int cs35l41_runtime_resume(struct device *dev)
+{
+	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
+	int ret;
+
+	dev_dbg(cs35l41->dev, "Resume.\n");
+
+	if (cs35l41->hw_cfg.bst_type == CS35L41_EXT_BOOST_NO_VSPK_SWITCH) {
+		dev_dbg(cs35l41->dev, "System does not support Resume\n");
+		return 0;
+	}
+
+	if (!cs35l41->firmware_running)
+		return 0;
+
+	regcache_cache_only(cs35l41->regmap, false);
+
+	ret = cs35l41_exit_hibernate(cs35l41->dev, cs35l41->regmap);
+	if (ret) {
+		regcache_cache_only(cs35l41->regmap, true);
+		return ret;
+	}
+
+	/* Test key needs to be unlocked to allow the OTP settings to re-apply */
+	cs35l41_test_key_unlock(cs35l41->dev, cs35l41->regmap);
+	ret = regcache_sync(cs35l41->regmap);
+	cs35l41_test_key_lock(cs35l41->dev, cs35l41->regmap);
+	if (ret) {
+		dev_err(cs35l41->dev, "Failed to restore register cache: %d\n", ret);
+		return ret;
+	}
+
+	if (cs35l41->hw_cfg.bst_type == CS35L41_EXT_BOOST)
+		cs35l41_init_boost(cs35l41->dev, cs35l41->regmap, &cs35l41->hw_cfg);
+
+	return 0;
+}
+
+static int cs35l41_hda_suspend_hook(struct device *dev)
+{
+	dev_dbg(dev, "Request Suspend\n");
+	pm_runtime_mark_last_busy(dev);
+	return pm_runtime_put_autosuspend(dev);
+}
+
+static int cs35l41_hda_resume_hook(struct device *dev)
+{
+	dev_dbg(dev, "Request Resume\n");
+	return pm_runtime_get_sync(dev);
+}
+
 static int cs35l41_smart_amp(struct cs35l41_hda *cs35l41)
 {
 	int halo_sts;
@@ -492,19 +562,27 @@ static int cs35l41_hda_bind(struct device *dev, struct device *master, void *mas
 	if (comps->dev)
 		return -EBUSY;
 
+	pm_runtime_get_sync(dev);
+
 	comps->dev = dev;
 	if (!cs35l41->acpi_subsystem_id)
 		cs35l41->acpi_subsystem_id = devm_kasprintf(dev, GFP_KERNEL, "%.8x",
 							    comps->codec->core.subsystem_id);
 	cs35l41->codec = comps->codec;
 	strscpy(comps->name, dev_name(dev), sizeof(comps->name));
-	comps->playback_hook = cs35l41_hda_playback_hook;
 
 	mutex_lock(&cs35l41->fw_mutex);
 	if (cs35l41_smart_amp(cs35l41) < 0)
 		dev_warn(cs35l41->dev, "Cannot Run Firmware, reverting to dsp bypass...\n");
 	mutex_unlock(&cs35l41->fw_mutex);
 
+	comps->playback_hook = cs35l41_hda_playback_hook;
+	comps->suspend_hook = cs35l41_hda_suspend_hook;
+	comps->resume_hook = cs35l41_hda_resume_hook;
+
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	return 0;
 }
 
@@ -600,7 +678,7 @@ static const struct regmap_irq cs35l41_reg_irqs[] = {
 	CS35L41_REG_IRQ(IRQ1_STATUS1, AMP_SHORT_ERR),
 };
 
-static const struct regmap_irq_chip cs35l41_regmap_irq_chip = {
+static struct regmap_irq_chip cs35l41_regmap_irq_chip = {
 	.name = "cs35l41 IRQ1 Controller",
 	.status_base = CS35L41_IRQ1_STATUS1,
 	.mask_base = CS35L41_IRQ1_MASK1,
@@ -608,6 +686,7 @@ static const struct regmap_irq_chip cs35l41_regmap_irq_chip = {
 	.num_regs = 4,
 	.irqs = cs35l41_reg_irqs,
 	.num_irqs = ARRAY_SIZE(cs35l41_reg_irqs),
+	.runtime_pm = true,
 };
 
 static int cs35l41_hda_apply_properties(struct cs35l41_hda *cs35l41)
@@ -1015,13 +1094,23 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
 
 	mutex_init(&cs35l41->fw_mutex);
 
+	pm_runtime_set_autosuspend_delay(cs35l41->dev, 3000);
+	pm_runtime_use_autosuspend(cs35l41->dev);
+	pm_runtime_mark_last_busy(cs35l41->dev);
+	pm_runtime_set_active(cs35l41->dev);
+	pm_runtime_get_noresume(cs35l41->dev);
+	pm_runtime_enable(cs35l41->dev);
+
 	ret = cs35l41_hda_apply_properties(cs35l41);
 	if (ret)
-		goto err;
+		goto err_pm;
+
+	pm_runtime_put_autosuspend(cs35l41->dev);
 
 	ret = component_add(cs35l41->dev, &cs35l41_hda_comp_ops);
 	if (ret) {
 		dev_err(cs35l41->dev, "Register component failed: %d\n", ret);
+		pm_runtime_disable(cs35l41->dev);
 		goto err;
 	}
 
@@ -1029,6 +1118,10 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
 
 	return 0;
 
+err_pm:
+	pm_runtime_disable(cs35l41->dev);
+	pm_runtime_put_noidle(cs35l41->dev);
+
 err:
 	if (cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type))
 		gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
@@ -1042,17 +1135,27 @@ void cs35l41_hda_remove(struct device *dev)
 {
 	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
 
+	pm_runtime_get_sync(cs35l41->dev);
+	pm_runtime_disable(cs35l41->dev);
+
 	if (cs35l41->halo_initialized)
 		cs35l41_remove_dsp(cs35l41);
 
 	component_del(cs35l41->dev, &cs35l41_hda_comp_ops);
 
+	pm_runtime_put_noidle(cs35l41->dev);
+
 	if (cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type))
 		gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
 	gpiod_put(cs35l41->reset_gpio);
 }
 EXPORT_SYMBOL_NS_GPL(cs35l41_hda_remove, SND_HDA_SCODEC_CS35L41);
 
+const struct dev_pm_ops cs35l41_hda_pm_ops = {
+	SET_RUNTIME_PM_OPS(cs35l41_runtime_suspend, cs35l41_runtime_resume, NULL)
+};
+EXPORT_SYMBOL_NS_GPL(cs35l41_hda_pm_ops, SND_HDA_SCODEC_CS35L41);
+
 MODULE_DESCRIPTION("CS35L41 HDA Driver");
 MODULE_IMPORT_NS(SND_HDA_CS_DSP_CONTROLS);
 MODULE_AUTHOR("Lucas Tanure, Cirrus Logic Inc, <tanureal@opensource.cirrus.com>");
diff --git a/sound/pci/hda/cs35l41_hda.h b/sound/pci/hda/cs35l41_hda.h
index a9dbc1c19248..439c4b705328 100644
--- a/sound/pci/hda/cs35l41_hda.h
+++ b/sound/pci/hda/cs35l41_hda.h
@@ -57,6 +57,8 @@ enum halo_state {
 	HALO_STATE_CODE_RUN
 };
 
+extern const struct dev_pm_ops cs35l41_hda_pm_ops;
+
 int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int irq,
 		      struct regmap *regmap);
 void cs35l41_hda_remove(struct device *dev);
diff --git a/sound/pci/hda/cs35l41_hda_i2c.c b/sound/pci/hda/cs35l41_hda_i2c.c
index df39fc76e6be..9c08fa08c421 100644
--- a/sound/pci/hda/cs35l41_hda_i2c.c
+++ b/sound/pci/hda/cs35l41_hda_i2c.c
@@ -54,6 +54,7 @@ static struct i2c_driver cs35l41_i2c_driver = {
 	.driver = {
 		.name		= "cs35l41-hda",
 		.acpi_match_table = cs35l41_acpi_hda_match,
+		.pm		= &cs35l41_hda_pm_ops,
 	},
 	.id_table	= cs35l41_hda_i2c_id,
 	.probe		= cs35l41_hda_i2c_probe,
diff --git a/sound/pci/hda/cs35l41_hda_spi.c b/sound/pci/hda/cs35l41_hda_spi.c
index 2f5afad3719e..71979cfb4d7e 100644
--- a/sound/pci/hda/cs35l41_hda_spi.c
+++ b/sound/pci/hda/cs35l41_hda_spi.c
@@ -49,6 +49,7 @@ static struct spi_driver cs35l41_spi_driver = {
 	.driver = {
 		.name		= "cs35l41-hda",
 		.acpi_match_table = cs35l41_acpi_hda_match,
+		.pm		= &cs35l41_hda_pm_ops,
 	},
 	.id_table	= cs35l41_hda_spi_id,
 	.probe		= cs35l41_hda_spi_probe,
diff --git a/sound/pci/hda/hda_component.h b/sound/pci/hda/hda_component.h
index 534e845b9cd1..1223621bd62c 100644
--- a/sound/pci/hda/hda_component.h
+++ b/sound/pci/hda/hda_component.h
@@ -16,4 +16,6 @@ struct hda_component {
 	char name[HDA_MAX_NAME_SIZE];
 	struct hda_codec *codec;
 	void (*playback_hook)(struct device *dev, int action);
+	int (*suspend_hook)(struct device *dev);
+	int (*resume_hook)(struct device *dev);
 };
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 44744d568404..7c21bc439c46 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4021,15 +4021,22 @@ static void alc5505_dsp_init(struct hda_codec *codec)
 static int alc269_suspend(struct hda_codec *codec)
 {
 	struct alc_spec *spec = codec->spec;
+	int i;
 
 	if (spec->has_alc5505_dsp)
 		alc5505_dsp_suspend(codec);
+
+	for (i = 0; i < HDA_MAX_COMPONENTS; i++)
+		if (spec->comps[i].suspend_hook)
+			spec->comps[i].suspend_hook(spec->comps[i].dev);
+
 	return alc_suspend(codec);
 }
 
 static int alc269_resume(struct hda_codec *codec)
 {
 	struct alc_spec *spec = codec->spec;
+	int i;
 
 	if (spec->codec_variant == ALC269_TYPE_ALC269VB)
 		alc269vb_toggle_power_output(codec, 0);
@@ -4060,6 +4067,10 @@ static int alc269_resume(struct hda_codec *codec)
 	if (spec->has_alc5505_dsp)
 		alc5505_dsp_resume(codec);
 
+	for (i = 0; i < HDA_MAX_COMPONENTS; i++)
+		if (spec->comps[i].resume_hook)
+			spec->comps[i].resume_hook(spec->comps[i].dev);
+
 	return 0;
 }
 #endif /* CONFIG_PM */
@@ -6610,8 +6621,20 @@ static int comp_bind(struct device *dev)
 {
 	struct hda_codec *cdc = dev_to_hda_codec(dev);
 	struct alc_spec *spec = cdc->spec;
+	int ret, i;
+
+	ret = component_bind_all(dev, spec->comps);
+	if (ret)
+		return ret;
 
-	return component_bind_all(dev, spec->comps);
+	if (snd_hdac_is_power_on(&cdc->core)) {
+		codec_dbg(cdc, "Resuming after bind.\n");
+		for (i = 0; i < HDA_MAX_COMPONENTS; i++)
+			if (spec->comps[i].resume_hook)
+				spec->comps[i].resume_hook(spec->comps[i].dev);
+	}
+
+	return 0;
 }
 
 static void comp_unbind(struct device *dev)