[PATCH 1/7] ALSA: hda/intel: Refactoring PM code

[Takashi Iwai <tiwai@suse.de>]

Make unified suspend / resume helpers and call them from both the
runtime- and the system-PM callbacks for simplifying code.

There are slight changes of call orders, but there shouldn't be any
functional difference after refactoring.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/pci/hda/hda_intel.c | 160 ++++++++++++++++----------------------
 1 file changed, 69 insertions(+), 91 deletions(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 76f03abd15ab..cc06a323c817 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -930,35 +930,82 @@ static int param_set_xint(const char *val, const struct kernel_param *kp)
 	mutex_unlock(&card_list_lock);
 	return 0;
 }
-#else
-#define azx_add_card_list(chip) /* NOP */
-#define azx_del_card_list(chip) /* NOP */
-#endif /* CONFIG_PM */
 
-#ifdef CONFIG_PM_SLEEP
 /*
  * power management
  */
-static int azx_suspend(struct device *dev)
+static bool azx_is_pm_ready(struct snd_card *card)
 {
-	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
 	struct hda_intel *hda;
-	struct hdac_bus *bus;
 
 	if (!card)
-		return 0;
-
+		return false;
 	chip = card->private_data;
 	hda = container_of(chip, struct hda_intel, chip);
 	if (chip->disabled || hda->init_failed || !chip->running)
+		return false;
+	return true;
+}
+
+static void __azx_runtime_suspend(struct azx *chip)
+{
+	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
+
+	azx_stop_chip(chip);
+	azx_enter_link_reset(chip);
+	azx_clear_irq_pending(chip);
+	if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
+	    hda->need_i915_power)
+		snd_hdac_display_power(azx_bus(chip), false);
+}
+
+static void __azx_runtime_resume(struct azx *chip)
+{
+	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
+	struct hdac_bus *bus = azx_bus(chip);
+	struct hda_codec *codec;
+	int status;
+
+	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
+		snd_hdac_display_power(bus, true);
+		if (hda->need_i915_power)
+			snd_hdac_i915_set_bclk(bus);
+	}
+
+	/* Read STATESTS before controller reset */
+	status = azx_readw(chip, STATESTS);
+
+	azx_init_pci(chip);
+	hda_intel_init_chip(chip, true);
+
+	if (status) {
+		list_for_each_codec(codec, &chip->bus)
+			if (status & (1 << codec->addr))
+				schedule_delayed_work(&codec->jackpoll_work,
+						      codec->jackpoll_interval);
+	}
+
+	/* power down again for link-controlled chips */
+	if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
+	    !hda->need_i915_power)
+		snd_hdac_display_power(bus, false);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int azx_suspend(struct device *dev)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct azx *chip;
+	struct hdac_bus *bus;
+
+	if (!azx_is_pm_ready(card))
 		return 0;
 
+	chip = card->private_data;
 	bus = azx_bus(chip);
 	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
-	azx_clear_irq_pending(chip);
-	azx_stop_chip(chip);
-	azx_enter_link_reset(chip);
+	__azx_runtime_suspend(chip);
 	if (bus->irq >= 0) {
 		free_irq(bus->irq, chip);
 		bus->irq = -1;
@@ -966,9 +1013,6 @@ static int azx_suspend(struct device *dev)
 
 	if (chip->msi)
 		pci_disable_msi(chip->pci);
-	if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
-		&& hda->need_i915_power)
-		snd_hdac_display_power(bus, false);
 
 	trace_azx_suspend(chip);
 	return 0;
@@ -976,41 +1020,19 @@ static int azx_suspend(struct device *dev)
 
 static int azx_resume(struct device *dev)
 {
-	struct pci_dev *pci = to_pci_dev(dev);
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
-	struct hda_intel *hda;
-	struct hdac_bus *bus;
 
-	if (!card)
+	if (!azx_is_pm_ready(card))
 		return 0;
 
 	chip = card->private_data;
-	hda = container_of(chip, struct hda_intel, chip);
-	bus = azx_bus(chip);
-	if (chip->disabled || hda->init_failed || !chip->running)
-		return 0;
-
-	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
-		snd_hdac_display_power(bus, true);
-		if (hda->need_i915_power)
-			snd_hdac_i915_set_bclk(bus);
-	}
-
 	if (chip->msi)
-		if (pci_enable_msi(pci) < 0)
+		if (pci_enable_msi(chip->pci) < 0)
 			chip->msi = 0;
 	if (azx_acquire_irq(chip, 1) < 0)
 		return -EIO;
-	azx_init_pci(chip);
-
-	hda_intel_init_chip(chip, true);
-
-	/* power down again for link-controlled chips */
-	if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
-	    !hda->need_i915_power)
-		snd_hdac_display_power(bus, false);
-
+	__azx_runtime_resume(chip);
 	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 
 	trace_azx_resume(chip);
@@ -1045,21 +1067,14 @@ static int azx_thaw_noirq(struct device *dev)
 }
 #endif /* CONFIG_PM_SLEEP */
 
-#ifdef CONFIG_PM
 static int azx_runtime_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
-	struct hda_intel *hda;
 
-	if (!card)
+	if (!azx_is_pm_ready(card))
 		return 0;
-
 	chip = card->private_data;
-	hda = container_of(chip, struct hda_intel, chip);
-	if (chip->disabled || hda->init_failed)
-		return 0;
-
 	if (!azx_has_pm_runtime(chip))
 		return 0;
 
@@ -1067,13 +1082,7 @@ static int azx_runtime_suspend(struct device *dev)
 	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
 		  STATESTS_INT_MASK);
 
-	azx_stop_chip(chip);
-	azx_enter_link_reset(chip);
-	azx_clear_irq_pending(chip);
-	if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
-		&& hda->need_i915_power)
-		snd_hdac_display_power(azx_bus(chip), false);
-
+	__azx_runtime_suspend(chip);
 	trace_azx_runtime_suspend(chip);
 	return 0;
 }
@@ -1082,51 +1091,18 @@ static int azx_runtime_resume(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
-	struct hda_intel *hda;
-	struct hdac_bus *bus;
-	struct hda_codec *codec;
-	int status;
 
-	if (!card)
+	if (!azx_is_pm_ready(card))
 		return 0;
-
 	chip = card->private_data;
-	hda = container_of(chip, struct hda_intel, chip);
-	bus = azx_bus(chip);
-	if (chip->disabled || hda->init_failed)
-		return 0;
-
 	if (!azx_has_pm_runtime(chip))
 		return 0;
-
-	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
-		snd_hdac_display_power(bus, true);
-		if (hda->need_i915_power)
-			snd_hdac_i915_set_bclk(bus);
-	}
-
-	/* Read STATESTS before controller reset */
-	status = azx_readw(chip, STATESTS);
-
-	azx_init_pci(chip);
-	hda_intel_init_chip(chip, true);
-
-	if (status) {
-		list_for_each_codec(codec, &chip->bus)
-			if (status & (1 << codec->addr))
-				schedule_delayed_work(&codec->jackpoll_work,
-						      codec->jackpoll_interval);
-	}
+	__azx_runtime_resume(chip);
 
 	/* disable controller Wake Up event*/
 	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
 			~STATESTS_INT_MASK);
 
-	/* power down again for link-controlled chips */
-	if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
-	    !hda->need_i915_power)
-		snd_hdac_display_power(bus, false);
-
 	trace_azx_runtime_resume(chip);
 	return 0;
 }
@@ -1167,6 +1143,8 @@ static const struct dev_pm_ops azx_pm = {
 
 #define AZX_PM_OPS	&azx_pm
 #else
+#define azx_add_card_list(chip) /* NOP */
+#define azx_del_card_list(chip) /* NOP */
 #define AZX_PM_OPS	NULL
 #endif /* CONFIG_PM */
 
-- 
2.19.2