Date:   Wed, 25 May 2022 14:16:33 +0100
From:   Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Mark Brown <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH v4 12/17] ALSA: hda: cs35l41: Support Hibernation during Suspend

From: Stefan Binding <sbinding@...nsource.cirrus.com>

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@...nsource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
---

Changes since v2:
 - No change
 
 sound/pci/hda/cs35l41_hda.c     | 109 +++++++++++++++++++++++++++++++-
 sound/pci/hda/cs35l41_hda.h     |   2 +
 sound/pci/hda/cs35l41_hda_i2c.c |   1 +
 sound/pci/hda/cs35l41_hda_spi.c |   1 +
 sound/pci/hda/hda_component.h   |   2 +
 sound/pci/hda/patch_realtek.c   |  25 +++++++-
 6 files changed, 136 insertions(+), 4 deletions(-)

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index 1d62a41fbc75..9c622104bf01 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"
@@ -425,6 +426,75 @@ 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;
@@ -482,17 +552,25 @@ 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->subsystem_id);
 	cs35l41->codec = comps->codec;
 	strscpy(comps->name, dev_name(dev), sizeof(comps->name));
-	comps->playback_hook = cs35l41_hda_playback_hook;
 
 	if (cs35l41_smart_amp(cs35l41) < 0)
 		dev_warn(cs35l41->dev, "Cannot Run Firmware, reverting to dsp bypass...\n");
 
+	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;
 }
 
@@ -588,7 +666,7 @@ 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,
@@ -596,6 +674,7 @@ 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)
@@ -1003,13 +1082,23 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
 	if (ret)
 		goto err;
 
+	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;
 	}
 
@@ -1017,6 +1106,10 @@ 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);
@@ -1030,17 +1123,27 @@ 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->firmware_running)
 		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@...nsource.cirrus.com>");
diff --git a/sound/pci/hda/cs35l41_hda.h b/sound/pci/hda/cs35l41_hda.h
index 717b30a2e33b..54521a013e78 100644
--- a/sound/pci/hda/cs35l41_hda.h
+++ b/sound/pci/hda/cs35l41_hda.h
@@ -56,6 +56,8 @@ 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 e810b278fb91..a669090a18e8 100644
--- a/sound/pci/hda/cs35l41_hda_i2c.c
+++ b/sound/pci/hda/cs35l41_hda_i2c.c
@@ -55,6 +55,7 @@ static struct i2c_driver cs35l41_i2c_driver = {
 	.driver = {
 		.name		= "cs35l41-hda",
 		.acpi_match_table = ACPI_PTR(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 22e088f28438..d7f15e2abe66 100644
--- a/sound/pci/hda/cs35l41_hda_spi.c
+++ b/sound/pci/hda/cs35l41_hda_spi.c
@@ -50,6 +50,7 @@ static struct spi_driver cs35l41_spi_driver = {
 	.driver = {
 		.name		= "cs35l41-hda",
 		.acpi_match_table = ACPI_PTR(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 fa6df52e7855..72ec0d865a28 100644
--- a/sound/pci/hda/hda_component.h
+++ b/sound/pci/hda/hda_component.h
@@ -17,4 +17,6 @@ struct hda_component {
 	int subsystem_id;
 	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 b8249c4dcb1d..fc2467d03b8a 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4006,15 +4006,22 @@ 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);
@@ -4045,6 +4052,10 @@ 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 */
@@ -6587,8 +6598,20 @@ 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)
-- 
2.34.1

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