ALSA: hda - add runtime PM support
Runtime PM can bring more power saving:
- When the controller is suspended, its parent device will also have a chance
to suspend.
- PCI subsystem can choose the lowest power state the controller can signal
wake up from. This state can be D3cold on platforms with ACPI PM support.
And runtime PM can provide a gerneral sysfs interface for a system policy
manager.
Runtime PM support is based on current HDA power saving implementation. The user
can enable runtime PM on platfroms that provide acceptable latency on transition
from D3 to D0.
Details:
- When both power saving and runtime PM are enabled:
-- If a codec supports 'stop-clock' in D3, it will request suspending the
controller after it enters D3 and request resuming the controller before
back to D0. Thus the controller will be suspended only when all codecs are
suspended and support stop-clock in D3.
-- User IO operations and HW wakeup signal can resume the controller back to
D0.
- If runtime PM is disabled, power saving just works as before.
- If power saving is disabled, the controller won't be suspended because the
power usage counter can never be 0.
More about 'stop-clock' feature:
If a codec can support targeted pass-through operations in D3 state when there
is no BCLK present on the link, it will set CLKSTOP flag in the supported power
states and report PS-ClkStopOk when entering D3 state. Please refer to HDA spec
section 7.3.3.10 Power state and 7.3.4.12 Supported Power State.
[Fixed CONFIG_PM_RUNTIME dependency in hda_intel.c by tiwai]
Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 209bea4..726f420 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -46,6 +46,7 @@
#include <linux/mutex.h>
#include <linux/reboot.h>
#include <linux/io.h>
+#include <linux/pm_runtime.h>
#ifdef CONFIG_X86
/* for snoop control */
#include <asm/pgtable.h>
@@ -1032,7 +1033,7 @@
}
#ifdef CONFIG_SND_HDA_POWER_SAVE
-static void azx_power_notify(struct hda_bus *bus);
+static void azx_power_notify(struct hda_bus *bus, struct hda_codec *codec);
#endif
/* reset codec link */
@@ -1288,6 +1289,11 @@
u8 sd_status;
int i, ok;
+#ifdef CONFIG_PM_RUNTIME
+ if (chip->pci->dev.power.runtime_status != RPM_ACTIVE)
+ return IRQ_NONE;
+#endif
+
spin_lock(&chip->reg_lock);
if (chip->disabled) {
@@ -2400,23 +2406,17 @@
#ifdef CONFIG_SND_HDA_POWER_SAVE
/* power-up/down the controller */
-static void azx_power_notify(struct hda_bus *bus)
+static void azx_power_notify(struct hda_bus *bus, struct hda_codec *codec)
{
struct azx *chip = bus->private_data;
- struct hda_codec *c;
- int power_on = 0;
- list_for_each_entry(c, &bus->codec_list, list) {
- if (c->power_on) {
- power_on = 1;
- break;
- }
- }
- if (power_on)
- azx_init_chip(chip, 1);
- else if (chip->running && power_save_controller &&
- !bus->power_keep_link_on)
- azx_stop_chip(chip);
+ if (bus->power_keep_link_on || !codec->d3_stop_clk_ok)
+ return;
+
+ if (codec->power_on)
+ pm_runtime_get_sync(&chip->pci->dev);
+ else
+ pm_runtime_put_sync(&chip->pci->dev);
}
static DEFINE_MUTEX(card_list_lock);
@@ -2520,11 +2520,43 @@
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
-static SIMPLE_DEV_PM_OPS(azx_pm, azx_suspend, azx_resume);
+#endif /* CONFIG_PM_SLEEP || SUPPORT_VGA_SWITCHEROO */
+
+#ifdef CONFIG_PM_RUNTIME
+static int azx_runtime_suspend(struct device *dev)
+{
+ struct snd_card *card = dev_get_drvdata(dev);
+ struct azx *chip = card->private_data;
+
+ if (!power_save_controller)
+ return -EAGAIN;
+
+ azx_stop_chip(chip);
+ azx_clear_irq_pending(chip);
+ return 0;
+}
+
+static int azx_runtime_resume(struct device *dev)
+{
+ struct snd_card *card = dev_get_drvdata(dev);
+ struct azx *chip = card->private_data;
+
+ azx_init_pci(chip);
+ azx_init_chip(chip, 1);
+ return 0;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops azx_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(azx_suspend, azx_resume)
+ SET_RUNTIME_PM_OPS(azx_runtime_suspend, azx_runtime_resume, NULL)
+};
+
#define AZX_PM_OPS &azx_pm
#else
#define AZX_PM_OPS NULL
-#endif /* CONFIG_PM_SLEEP || SUPPORT_VGA_SWITCHEROO */
+#endif /* CONFIG_PM */
/*
@@ -3239,6 +3271,15 @@
}
#endif
+static void rpm_get_all_codecs(struct azx *chip)
+{
+ struct hda_codec *codec;
+
+ list_for_each_entry(codec, &chip->bus->codec_list, list) {
+ pm_runtime_get_noresume(&chip->pci->dev);
+ }
+}
+
static int __devinit azx_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
@@ -3290,6 +3331,9 @@
pci_set_drvdata(pci, card);
+ if (pci_dev_run_wake(pci))
+ pm_runtime_put_noidle(&pci->dev);
+
dev++;
return 0;
@@ -3342,6 +3386,7 @@
goto out_free;
chip->running = 1;
+ rpm_get_all_codecs(chip); /* all codecs are active */
power_down_all_codecs(chip);
azx_notifier_register(chip);
azx_add_card_list(chip);
@@ -3356,6 +3401,10 @@
static void __devexit azx_remove(struct pci_dev *pci)
{
struct snd_card *card = pci_get_drvdata(pci);
+
+ if (pci_dev_run_wake(pci))
+ pm_runtime_get_noresume(&pci->dev);
+
if (card)
snd_card_free(card);
pci_set_drvdata(pci, NULL);