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_codec.c b/sound/pci/hda/hda_codec.c
index 4efd271..0de1f76 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1209,6 +1209,9 @@
kfree(codec);
}
+static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec,
+ hda_nid_t fg, unsigned int power_state);
+
static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,
unsigned int power_state);
@@ -1317,6 +1320,12 @@
AC_VERB_GET_SUBSYSTEM_ID, 0);
}
+ codec->d3_stop_clk = snd_hda_codec_get_supported_ps(codec,
+ codec->afg ? codec->afg : codec->mfg,
+ AC_PWRST_CLKSTOP);
+ if (!codec->d3_stop_clk)
+ bus->power_keep_link_on = 1;
+
/* power-up all before initialization */
hda_set_power_state(codec,
codec->afg ? codec->afg : codec->mfg,
@@ -3535,6 +3544,8 @@
int count;
unsigned int state;
+ codec->d3_stop_clk_ok = 0;
+
if (codec->patch_ops.set_power_state) {
codec->patch_ops.set_power_state(codec, fg, power_state);
return;
@@ -3557,6 +3568,10 @@
if (!(state & AC_PWRST_ERROR))
break;
}
+
+ if ((power_state == AC_PWRST_D3)
+ && codec->d3_stop_clk && (state & AC_PWRST_CLK_STOP_OK))
+ codec->d3_stop_clk_ok = 1;
}
#ifdef CONFIG_SND_HDA_HWDEP
@@ -4408,7 +4423,7 @@
hda_call_codec_suspend(codec);
if (bus->ops.pm_notify)
- bus->ops.pm_notify(bus);
+ bus->ops.pm_notify(bus, codec);
}
static void hda_keep_power_on(struct hda_codec *codec)
@@ -4466,7 +4481,7 @@
spin_unlock(&codec->power_lock);
if (bus->ops.pm_notify)
- bus->ops.pm_notify(bus);
+ bus->ops.pm_notify(bus, codec);
hda_call_codec_resume(codec);
spin_lock(&codec->power_lock);