[PATCH] ALSA: hda/realtek: Add quirk for Dell Latitude 7520

[gabriele.mzt@gmail.com]

From: Gabriele Mazzotta <gabriele.mzt@gmail.com>

This fixes the pop noises that can be heard at boot time if the
headphone jack is plugged in or when inserting/removing the jack.

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
---
 sound/pci/hda/patch_realtek.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 62fbf3772b41..fa9878daa3bb 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -6780,6 +6780,23 @@ static void alc256_fixup_mic_no_presence_and_resume(struct hda_codec *codec,
 	}
 }
 
+static void alc_fixup_dell4_mic_vref(struct hda_codec *codec,
+				     const struct hda_fixup *fix,
+				     int action)
+{
+	switch (action) {
+	case HDA_FIXUP_ACT_PRE_PROBE:
+		/**
+		 * Set the vref of pin 0x19 (Headset Mic) and pin 0x1b (Headphone Mic)
+		 * to Hi-Z to avoid pop noises at startup and when plugging and
+		 * unplugging headphones/speakers.
+		 */
+		snd_hda_codec_set_pin_target(codec, 0x19, PIN_VREFHIZ);
+		snd_hda_codec_set_pin_target(codec, 0x1b, PIN_VREFHIZ);
+		break;
+	}
+}
+
 enum {
 	ALC269_FIXUP_GPIO2,
 	ALC269_FIXUP_SONY_VAIO,
@@ -7011,6 +7028,7 @@ enum {
 	ALC245_FIXUP_CS35L41_SPI_4,
 	ALC245_FIXUP_CS35L41_SPI_4_HP_GPIO_LED,
 	ALC285_FIXUP_HP_SPEAKERS_MICMUTE_LED,
+	ALC269_FIXUP_DELL4_MIC_NO_PRESENCE_VREF,
 };
 
 static const struct hda_fixup alc269_fixups[] = {
@@ -8799,6 +8817,12 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC285_FIXUP_HP_MUTE_LED,
 	},
+	[ALC269_FIXUP_DELL4_MIC_NO_PRESENCE_VREF] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc_fixup_dell4_mic_vref,
+		.chained = true,
+		.chain_id = ALC269_FIXUP_DELL4_MIC_NO_PRESENCE,
+	},
 };
 
 static const struct snd_pci_quirk alc269_fixup_tbl[] = {
@@ -8889,6 +8913,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x1028, 0x09bf, "Dell Precision", ALC233_FIXUP_ASUS_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1028, 0x0a2e, "Dell", ALC236_FIXUP_DELL_AIO_HEADSET_MIC),
 	SND_PCI_QUIRK(0x1028, 0x0a30, "Dell", ALC236_FIXUP_DELL_AIO_HEADSET_MIC),
+	SND_PCI_QUIRK(0x1028, 0x0a38, "Dell Latitude 7520", ALC269_FIXUP_DELL4_MIC_NO_PRESENCE_VREF),
 	SND_PCI_QUIRK(0x1028, 0x0a58, "Dell", ALC255_FIXUP_DELL_HEADSET_MIC),
 	SND_PCI_QUIRK(0x1028, 0x0a61, "Dell XPS 15 9510", ALC289_FIXUP_DUAL_SPK),
 	SND_PCI_QUIRK(0x1028, 0x0a62, "Dell Precision 5560", ALC289_FIXUP_DUAL_SPK),
-- 
2.36.0