t480/t480s - add patches/coreboot-25.09/0006-mb-lenovo-t480-Fix-headphone-jack.patch

Repro:
git fetch https://review.coreboot.org/coreboot refs/changes/23/90023/2 && git format-patch -1 --stdout FETCH_HEAD > patches/coreboot-25.09/0006-mb-lenovo-t480-Fix-headphone-jack.patch
echo "bogus" | sudo tee build/x86/coreboot-25.09/.canary
./repro_prod.sh BOARD=EOL-t480s-maximized

This can be seen per https://review.coreboot.org/c/coreboot/+/90023:
- click download button
- copy paste section "format patch" : "git fetch https://review.coreboot.org/coreboot refs/changes/23/90023/2 && git format-patch -1 --stdout FETCH_HEAD"
- append redirection to where patch is desired "> patches/coreboot-25.09/0006-mb-lenovo-t480-Fix-headphone-jack.patch"
- this gives the patch command line + redirection to file so Heads applies it
- overwrite coreboot canary file with bogus content so that next build resync coreboot tree and reapplies patches
- launch build for board

Signed-off-by: Thierry Laurion <insurgo@riseup.net>

Author: tlaurion

patches/coreboot-25.09/0006-mb-lenovo-t480-Fix-headphone-jack.patch

@@ -0,0 +1,79 @@
+From 95532d31c348cfa3d847885e7c4d7d2b97b1d7d7 Mon Sep 17 00:00:00 2001
+From: Arthur Heymans <arthur@aheymans.xyz>
+Date: Thu, 13 Nov 2025 15:45:46 +0100
+Subject: [PATCH] mb/lenovo/t480: Fix headphone jack
+
+Add additional register configuration for the Realtek ALC257 audio
+codec on the Lenovo ThinkPad T480. This includes:
+
+- Hidden register SW reset sequence
+- ClassD 2W amplifier configuration
+- Jack detection (JD1) setup for headphone port
+- Silence data mode threshold setting at -84dB
+
+Shamelessly taken from google/brya/variants/pujjolo/hda_verb.c
+
+Change-Id: Ib77138d782ceb9feeaef82935bc1c0d5c3066183
+Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
+---
+ .../sklkbl_thinkpad/variants/t480/hda_verb.c  | 37 ++++++++++++++++++-
+ 1 file changed, 36 insertions(+), 1 deletion(-)
+
+diff --git a/src/mainboard/lenovo/sklkbl_thinkpad/variants/t480/hda_verb.c b/src/mainboard/lenovo/sklkbl_thinkpad/variants/t480/hda_verb.c
+index 3a951ce0dab..e0caff3db51 100644
+--- a/src/mainboard/lenovo/sklkbl_thinkpad/variants/t480/hda_verb.c
++++ b/src/mainboard/lenovo/sklkbl_thinkpad/variants/t480/hda_verb.c
+@@ -5,7 +5,7 @@
+ const u32 cim_verb_data[] = {
+ 	0x10ec0257, // Vendor/Device ID: Realtek ALC257
+ 	0x17aa225d, // Subsystem ID
+-	11,
++	18,
+ 	AZALIA_SUBVENDOR(0, 0x17aa225d),
+ 
+ 	AZALIA_PIN_CFG(0, 0x12, AZALIA_PIN_DESC(
+@@ -51,6 +51,41 @@ const u32 cim_verb_data[] = {
+ 		1, 15
+ 	)),
+ 
++		//==========Widget node 0x20 - 0 :Hidden register SW reset
++	0x0205001A,
++	0x0204C003,
++	0x0205001A,
++	0x0204C003,
++	0x05850000,
++	0x0584F880,
++	0x05850000,
++	0x0584F880,
++	//==========Widget node 0x20 - 1 : ClassD 2W
++	0x02050038,
++	0x02048981,
++	0x0205001B,
++	0x02040A4B,
++	//==========Widget node 0x20 - 2
++	0x0205003C,
++	0x02043154,
++	0x0205003C,
++	0x02043114,
++	//==========Widget node 0x20 - 3 :
++	0x02050046,
++	0x02040004,
++	0x05750003,
++	0x057409A3,
++	//==========Widget node 0x20 - 4 :JD1 enable 1JD port for HP JD
++	0x02050009,
++	0x02046003,
++	0x0205000A,
++	0x02047770,
++	//==========Widget node 0x20 - 5 : Silence data mode Threshold (-84dB)
++	0x02050037,
++	0x0204FE15,
++	0x02050030,
++	0x02049004,
++
+ 	0x8086280b, // Vendor/Device ID: Intel Kabylake HDMI
+ 	0x80860101, // Subsystem ID
+ 	4,
+-- 
+2.39.5
+