AYN Odin 2: fix external display output: micro HDMI capped at 1024x768, USB-C output often undetected, audio broken across hotplug and sleep

projects/ROCKNIX/devices/SM8550/patches/linux/0517-usb-typec-mux-dont-swallow-EPROBE_DEFER.patch

@@ -0,0 +1,93 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:03 2001
+From: Anze <aanzdev@gmail.com>
+Date: Mon, 27 Jul 2026 18:00:00 +0200
+Subject: [PATCH] usb: typec: mux: don't swallow EPROBE_DEFER in the dedup check
+
+The 7.1 merge window added a "skip duplicates" filter to typec_mux_match()
+and typec_switch_match(), and started passing the output array in as the
+match data so it can be compared against. Both halves are broken for a
+connector whose mux is not registered yet.
+
+struct device is the FIRST member of struct typec_mux_dev and struct
+typec_switch_dev, so container_of() on a NULL device yields NULL. When
+class_find_device() finds nothing - the normal case while the mux driver
+has not probed yet, e.g. an i2c retimer such as wcd939x-usbss - the dedup
+loop compares that NULL against an array slot that is also NULL, matches,
+and returns NULL. The caller reads that as "no such connection" instead
+of the -EPROBE_DEFER it used to get, so the connector is created WITHOUT
+its mux, permanently: the DP lanes and the AUX/SBU pair are never routed.
+
+The arrays are also uninitialised stack (`struct typec_mux_dev
+*mux_devs[TYPEC_MUX_MAX_DEVS];`), yet the dedup loop reads every slot
+before fwnode_connection_find_matches() has filled them, so a valid mux
+can be dropped by a chance comparison against stack garbage.
+
+Bail out with -EPROBE_DEFER before the dedup loop when no device was
+found, and zero-initialise both arrays.
+
+Device-observed on an AYN Odin 3 (SM8750): dock DisplayPort output died
+with the 7.0.11 -> 7.1.3 bump. The firmware enters DP alt mode correctly
+(mux_ctrl=3, pin_assignment=4), raises HPD, and msm_dp powers up its
+clocks and PHY - then the very first DPCD read times out
+(drm_dp_dpcd_probe ... AUX -> (ret=-110)), link_ready stays false and the
+connector reports disconnected, because nothing ever routed the lanes.
+
+Signed-off-by: Anze <aanzdev@gmail.com>
+---
+--- a/drivers/usb/typec/mux.c	2026-07-27 17:07:50.988901877 +0200
++++ b/drivers/usb/typec/mux.c	2026-07-27 17:07:51.010296597 +0200
+@@ -57,6 +57,8 @@
+ 	 */
+ 	dev = class_find_device(&typec_mux_class, NULL, fwnode,
+ 				switch_fwnode_match);
++	if (!dev)
++		return ERR_PTR(-EPROBE_DEFER);
+
+ 	/* Skip duplicates */
+ 	for (i = 0; i < TYPEC_MUX_MAX_DEVS; i++)
+@@ -65,7 +67,7 @@
+ 			return NULL;
+ 		}
+
+-	return dev ? to_typec_switch_dev(dev) : ERR_PTR(-EPROBE_DEFER);
++	return to_typec_switch_dev(dev);
+ }
+
+ /**
+@@ -79,7 +81,7 @@
+  */
+ struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode)
+ {
+-	struct typec_switch_dev *sw_devs[TYPEC_MUX_MAX_DEVS];
++	struct typec_switch_dev *sw_devs[TYPEC_MUX_MAX_DEVS] = {};
+ 	struct typec_switch *sw;
+ 	int count;
+ 	int err;
+@@ -292,6 +294,8 @@
+
+ 	dev = class_find_device(&typec_mux_class, NULL, fwnode,
+ 				mux_fwnode_match);
++	if (!dev)
++		return ERR_PTR(-EPROBE_DEFER);
+
+ 	/* Skip duplicates */
+ 	for (i = 0; i < TYPEC_MUX_MAX_DEVS; i++)
+@@ -300,8 +304,7 @@
+ 			return NULL;
+ 		}
+
+-
+-	return dev ? to_typec_mux_dev(dev) : ERR_PTR(-EPROBE_DEFER);
++	return to_typec_mux_dev(dev);
+ }
+
+ /**
+@@ -315,7 +318,7 @@
+  */
+ struct typec_mux *fwnode_typec_mux_get(struct fwnode_handle *fwnode)
+ {
+-	struct typec_mux_dev *mux_devs[TYPEC_MUX_MAX_DEVS];
++	struct typec_mux_dev *mux_devs[TYPEC_MUX_MAX_DEVS] = {};
+ 	struct typec_mux *mux;
+ 	int count;
+ 	int err;

projects/ROCKNIX/packages/hardware/quirks/devices/AYN Odin 2 Mini/011-external-display

@@ -0,0 +1,37 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026 ROCKNIX (https://github.com/ROCKNIX)
+
+# External display support for the micro HDMI port.
+#
+# The micro HDMI port sits behind a Lontium LT8912B DSI-to-HDMI bridge
+# with no DDC support at all (per Lontium's product brief), so the
+# display's EDID can never be read and without help everything falls
+# back to 1024x768. Arm a synthetic EDID on the connector with the two
+# modes the bridge handles well:
+#
+#   1920x1080@60 (preferred)
+#   1280x720@60
+#
+# The bridge caps at 1920x1080 / 150 MHz. 30 Hz modes were tested and
+# come out broken, so they are not offered.
+#
+# Pick the mode with: set_setting external_display.mode auto|<mode>
+#
+# No audio on this port: the lt8912b driver has no audio support, so
+# sound stays on the speakers. The USB-C DisplayPort path is unrelated
+# and already handles EDID and audio natively.
+
+# Mode list for a future settings menu, and the audio capability flag.
+cat <<EOF >/storage/.config/profile.d/011-external_display
+DEVICE_EXTERNAL_DISPLAY_MODES="1280x720@60 1920x1080@60"
+DEVICE_EXTERNAL_DISPLAY_AUDIO="false"
+EOF
+
+# Arm the EDID before sway starts; the kernel picks it up on the next
+# connector probe (i.e. when a display is plugged in).
+EDID_B64="AP///////wAx2AAAAAAAAAUkAQOAEAl4AgAAAAAAAAAAAAAAAAABAQEBAQEBAQEBAQEBAQEBAjqAGHE4LUBYLEUAAAAAAAAeAR0AclHQHiBuKFUAAAAAAAAeAAAAEAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAMQ="
+for OVERRIDE in /sys/kernel/debug/dri/*/HDMI-A-1/edid_override; do
+  [ -e "${OVERRIDE}" ] || continue
+  echo "${EDID_B64}" | base64 -d >"${OVERRIDE}"
+done

projects/ROCKNIX/packages/hardware/quirks/devices/AYN Odin 2/011-external-display

@@ -0,0 +1,37 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026 ROCKNIX (https://github.com/ROCKNIX)
+
+# External display support for the micro HDMI port.
+#
+# The micro HDMI port sits behind a Lontium LT8912B DSI-to-HDMI bridge
+# with no DDC support at all (per Lontium's product brief), so the
+# display's EDID can never be read and without help everything falls
+# back to 1024x768. Arm a synthetic EDID on the connector with the two
+# modes the bridge handles well:
+#
+#   1920x1080@60 (preferred)
+#   1280x720@60
+#
+# The bridge caps at 1920x1080 / 150 MHz. 30 Hz modes were tested and
+# come out broken, so they are not offered.
+#
+# Pick the mode with: set_setting external_display.mode auto|<mode>
+#
+# No audio on this port: the lt8912b driver has no audio support, so
+# sound stays on the speakers. The USB-C DisplayPort path is unrelated
+# and already handles EDID and audio natively.
+
+# Mode list for a future settings menu, and the audio capability flag.
+cat <<EOF >/storage/.config/profile.d/011-external_display
+DEVICE_EXTERNAL_DISPLAY_MODES="1280x720@60 1920x1080@60"
+DEVICE_EXTERNAL_DISPLAY_AUDIO="false"
+EOF
+
+# Arm the EDID before sway starts; the kernel picks it up on the next
+# connector probe (i.e. when a display is plugged in).
+EDID_B64="AP///////wAx2AAAAAAAAAUkAQOAEAl4AgAAAAAAAAAAAAAAAAABAQEBAQEBAQEBAQEBAQEBAjqAGHE4LUBYLEUAAAAAAAAeAR0AclHQHiBuKFUAAAAAAAAeAAAAEAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAMQ="
+for OVERRIDE in /sys/kernel/debug/dri/*/HDMI-A-1/edid_override; do
+  [ -e "${OVERRIDE}" ] || continue
+  echo "${EDID_B64}" | base64 -d >"${OVERRIDE}"
+done

projects/ROCKNIX/packages/hardware/quirks/profile.d/999-export

@@ -17,6 +17,8 @@ export  OS_VERSION \
 	DEVICE_AUDIO_MIXER \
 	DEVICE_BATTERY_LED_STATUS \
 	DEVICE_DTB_SWITCH \
+	DEVICE_EXTERNAL_DISPLAY_AUDIO \
+	DEVICE_EXTERNAL_DISPLAY_MODES \
 	DEVICE_FAKE_JACKSENSE \
 	DEVICE_FUNC_KEYA_MODIFIER \
 	DEVICE_FUNC_KEYB_MODIFIER \

projects/ROCKNIX/packages/rocknix/config/system/configs/system.cfg

@@ -47,6 +47,7 @@ display.saturation=50
 dreamcast.integerscale=0
 dreamcast.ratio=4/3
 easyrpg.integerscale=0
+external_display.mode=auto
 famicom.integerscale=0
 famicom.ratio=4/3
 fbn.integerscale=0

projects/ROCKNIX/packages/rocknix/sources/scripts/external-display

@@ -0,0 +1,139 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026-present ROCKNIX (https://github.com/ROCKNIX)
+
+### Summary
+#   External display state, and blanking that is safe around one.
+#
+#   Three callers need the same two answers and kept their own copies of
+#   both: rocknix-fake-suspend, output_monitor, and the platform power
+#   handlers for devices that have real suspend. Drifting apart on either
+#   one is a bug in itself, so they all come here now.
+###
+
+### Usage
+#   external-display connected   exit 0 if an external display is attached
+#   external-display list        connected external connectors, one per line
+#   external-display internals   internal panel outputs, as the compositor names them
+#   external-display blank [backlight]
+#   external-display unblank
+###
+
+. /etc/profile
+
+case $(get_setting system.loglevel) in
+verbose) DEBUG=true ;;
+*)       DEBUG=false ;;
+esac
+
+### Connector status is the kernel's, so it is right even when the
+### compositor missed the hotplug event. DP covers the USB-C alt mode docks
+### and any adapter behind them; the leading dash is what keeps eDP panels
+### from matching as external.
+_external_status_files() {
+  local STATUS
+  for STATUS in /sys/class/drm/card*-HDMI-A-[0-9]*/status \
+                /sys/class/drm/card*-DP-[0-9]*/status; do
+    [ -f "${STATUS}" ] && echo "${STATUS}"
+  done
+}
+
+_connector_name() {
+  local NAME="${1%/status}"
+  NAME="${NAME##*/}"
+  echo "${NAME#card*-}"
+}
+
+### Which compositor is both configured and running.
+_compositor_is() {
+  case "${UI_SERVICE}" in
+    *"${1}"*) ;;
+    *) return 1 ;;
+  esac
+  pgrep "${1}" >/dev/null 2>&1
+}
+
+_backlight() {
+  local BL
+  for BL in /sys/class/backlight/*/bl_power; do
+    [ -w "${BL}" ] && echo "${1}" >"${BL}"
+  done
+}
+
+list() {
+  local STATUS
+  for STATUS in $(_external_status_files); do
+    [ "$(cat "${STATUS}")" = "connected" ] && _connector_name "${STATUS}"
+  done
+  return 0
+}
+
+connected() {
+  local STATUS
+  for STATUS in $(_external_status_files); do
+    [ "$(cat "${STATUS}")" = "connected" ] && return 0
+  done
+  return 1
+}
+
+internals() {
+  wlr-randr 2>/dev/null | awk '/^(DSI|eDP|LVDS)-/ { print $1 }'
+}
+
+### Internal panels only. A DPMS off on an active DP output makes
+### msm_dp_display_disable() report the audio jack as unplugged, and the HPD
+### plug events that would undo it are discarded while the output is off, so
+### dock audio stays dead until a physical replug.
+blank() {
+  local OUT COUNT=0
+
+  if [ "${1}" = "backlight" ]; then
+    ${DEBUG} && log $0 "Blank: backlight"
+    _backlight 4
+    return 0
+  fi
+
+  if _compositor_is sway; then
+    for OUT in $(internals); do
+      swaymsg "output ${OUT} power off" >/dev/null 2>&1 && COUNT=$((COUNT + 1))
+    done
+  elif _compositor_is weston; then
+    weston-dpms -m off >/dev/null 2>&1 && COUNT=1
+  fi
+
+  ### No compositor, or it knew of no internal panel to blank. Without this
+  ### the screen would simply stay on.
+  if [ "${COUNT}" -eq 0 ]; then
+    ${DEBUG} && log $0 "Blank: no panel powered off via DPMS, using backlight"
+    _backlight 4
+  else
+    ${DEBUG} && log $0 "Blank: ${COUNT} panel(s) powered off"
+  fi
+}
+
+### Both layers, unconditionally: whichever one blanked the panel, the other
+### must not be left holding it dark. Every output rather than the internals
+### alone, so an external that something else powered down comes back as
+### well; powering on a display that is already on does nothing.
+unblank() {
+  ${DEBUG} && log $0 "Unblank"
+  _backlight 0
+
+  if _compositor_is sway; then
+    swaymsg "output * power on" >/dev/null 2>&1
+  elif _compositor_is weston; then
+    weston-dpms -m on >/dev/null 2>&1
+  fi
+}
+
+case "${1}" in
+  connected) connected ;;
+  list)      list ;;
+  internals) internals ;;
+  blank)     blank "${2}" ;;
+  unblank)   unblank ;;
+  *)
+    echo "usage: ${0##*/} connected|list|internals|blank [backlight]|unblank" >&2
+    exit 2
+    ;;
+esac