[PATCH] ALSA: hda/realtek: add more delay time before determine_headset_type

[Hui Wang <hui.wang@canonical.com>]

We found a recording issue on the headset-mic recently, sometimes
users plug a headset and select headset-mic from UI, but can't record
any sound from headset-mic. The root cause is the
determine_headset_type() returns a wrong type, e.g. users plug a ctia
type headset, but that function returns omtp type.

In the past, determine_headset_type() worked well because the internal
mic is connected to the codec, so the "Input Source" or
"Capture Source" is internal mic by default when users plug a headset,
the determine_headset_type() will not be called unless users select
headset-mic from UI, when users select headset-mic, the plugging
action already finished and the headset is completely plugged into the
jack, so determine_headset_type() could return a correct type.

But more and more machines connect the internal mic to the PCH now,
and the "Input Source" is headset mic by default, when users plug a
headset, the determine_headset_type() will be called immediately, if
the headset is not completely plugged in, it will return a wrong type.

Here add 2s delay before calling determine_headset_type(), and since
there is a pop-up dialogue when users do plugging action, to avoid
freezing the UI, use the deleyed_work to call that function.

Signed-off-by: Hui Wang <hui.wang@canonical.com>
---
 sound/pci/hda/patch_realtek.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index b47504fa8dfd..1f6fc8addf3e 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -127,6 +127,8 @@ struct alc_spec {
 	unsigned int coef0;
 	struct input_dev *kb_dev;
 	u8 alc_mute_keycode_map[1];
+	struct hda_codec *codec;
+	struct delayed_work headset_set_work;
 };
 
 /*
@@ -1160,6 +1162,7 @@ static int alc_alloc_spec(struct hda_codec *codec, hda_nid_t mixer_nid)
 		kfree(spec);
 		return err;
 	}
+	spec->codec = codec;
 	return 0;
 }
 
@@ -5363,6 +5366,21 @@ static void alc_determine_headset_type(struct hda_codec *codec)
 	spec->current_headset_type = is_ctia ? ALC_HEADSET_TYPE_CTIA : ALC_HEADSET_TYPE_OMTP;
 }
 
+static void alc_headset_check_and_set(struct work_struct *work)
+{
+	struct alc_spec *spec = container_of(work, struct alc_spec,
+					     headset_set_work.work);
+	struct hda_codec *codec = spec->codec;
+
+	if (spec->current_headset_type == ALC_HEADSET_TYPE_UNKNOWN)
+		alc_determine_headset_type(codec);
+	if (spec->current_headset_type == ALC_HEADSET_TYPE_CTIA)
+		alc_headset_mode_ctia(codec);
+	else if (spec->current_headset_type == ALC_HEADSET_TYPE_OMTP)
+		alc_headset_mode_omtp(codec);
+	spec->gen.hp_jack_present = true;
+}
+
 static void alc_update_headset_mode(struct hda_codec *codec)
 {
 	struct alc_spec *spec = codec->spec;
@@ -5386,6 +5404,7 @@ static void alc_update_headset_mode(struct hda_codec *codec)
 		return;
 	}
 
+	cancel_delayed_work_sync(&spec->headset_set_work);
 	switch (new_headset_mode) {
 	case ALC_HEADSET_MODE_UNPLUGGED:
 		alc_headset_mode_unplugged(codec);
@@ -5394,13 +5413,7 @@ static void alc_update_headset_mode(struct hda_codec *codec)
 		spec->gen.hp_jack_present = false;
 		break;
 	case ALC_HEADSET_MODE_HEADSET:
-		if (spec->current_headset_type == ALC_HEADSET_TYPE_UNKNOWN)
-			alc_determine_headset_type(codec);
-		if (spec->current_headset_type == ALC_HEADSET_TYPE_CTIA)
-			alc_headset_mode_ctia(codec);
-		else if (spec->current_headset_type == ALC_HEADSET_TYPE_OMTP)
-			alc_headset_mode_omtp(codec);
-		spec->gen.hp_jack_present = true;
+		schedule_delayed_work(&spec->headset_set_work, msecs_to_jiffies(2000));
 		break;
 	case ALC_HEADSET_MODE_MIC:
 		alc_headset_mode_mic_in(codec, hp_pin, spec->headphone_mic_pin);
@@ -5466,6 +5479,7 @@ static void alc_fixup_headset_mode(struct hda_codec *codec,
 		spec->parse_flags |= HDA_PINCFG_HEADSET_MIC | HDA_PINCFG_HEADPHONE_MIC;
 		break;
 	case HDA_FIXUP_ACT_PROBE:
+		INIT_DELAYED_WORK(&spec->headset_set_work, alc_headset_check_and_set);
 		alc_probe_headset_mode(codec);
 		break;
 	case HDA_FIXUP_ACT_INIT:
@@ -5475,6 +5489,9 @@ static void alc_fixup_headset_mode(struct hda_codec *codec,
 		}
 		alc_update_headset_mode(codec);
 		break;
+	case HDA_FIXUP_ACT_FREE:
+		cancel_delayed_work_sync(&spec->headset_set_work);
+		break;
 	}
 }
 
-- 
2.25.1