[alsa-devel] [PATCH] ALSA: hda - modem function group wake on ring support

[Wang Xingchao]

 D2 allows for the lowest possible power consuming
 state from which it can return to "fully on" state D0 within 2ms.
 For modems, it's the "wake on ring" power state.

Signed-off-by: Wang Xingchao <xingchao.wang at intel.com>
---
 sound/pci/hda/hda_codec.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 2737fe7..d0ca370 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -3542,6 +3542,18 @@ static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,
 	snd_hda_codec_set_power_to_all(codec, fg, power_state, true);
 }
 
+/* modem wake on ring: transition from D2 to D0 in less than 2ms. For modems,
+ * this is the wake-on-ring power state  */
+static void hda_modem_wake_on_ring(struct hda_codec *codec, bool enter)
+{
+	if (codec->mfg) {
+		if (enter)
+			hda_set_power_state(codec, codec->mfg, AC_PWRST_D2);
+		else
+			hda_set_power_state(codec, codec->mfg, AC_PWRST_D0);
+	}
+}
+
 #ifdef CONFIG_SND_HDA_HWDEP
 /* execute additional init verbs */
 static void hda_exec_init_verbs(struct hda_codec *codec)
-- 
1.7.9.5