Generic: added intel-gpu-max-10-bit.sh helper

This uses modetest to set max 10 bit to solve
https://forum.libreelec.tv/thread/27886-intel-alder-lake-2160p-23-976-hz-passthrough-hd-audio-dropouts-i7-1270p-n100/
the upstream Intel issue is here
https://gitlab.freedesktop.org/drm/intel/-/issues/10199

projects/Generic/filesystem/usr/bin/intel-gpu-max-10-bit.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2024-present Team LibreELEC (https://libreelec.tv)
+
+LANG=en_US.UTF-8
+export LANG
+
+. /etc/os-release
+
+PARAM="$@"
+
+# help
+if [ "$1" = "--help" -o "$1" = "-h" ]; then
+  echo "$0 [--vgaport <port>]"
+  exit 0
+fi
+
+## workaround for Adler Lake and later GPU
+# https://forum.libreelec.tv/thread/27886-intel-alder-lake-2160p-23-976-hz-passthrough-hd-audio-dropouts-i7-1270p-n100/
+
+# on ADL10 image no workaround needed
+if [ "${LIBREELEC_DEVICE}" = "Generic-ADL10" -o -f /storage/.dont-activate-10-bit-max ]; then
+  echo "INFO: you running Generic-ADL10 where the kernel has a fix"
+  echo "      or you touched /storage/.dont-activate-10-bit-max"
+  echo "      so nothing will be done"
+  exit 0
+fi
+
+BIT=10
+NOT="max ${BIT} bit not activated"
+
+# do we have a Intel GPU
+lspci | grep -qEi 'VGA .* Intel '
+if [ $? -ne 0 ]; then
+  echo "No Intel GPU found, ${NOT}"
+  exit
+fi
+
+# command line / eviroment check
+if [ "$1" = "--vgaport" -a -n "$2" ]; then
+  VGAPORT="$2"
+  shift
+  shift
+fi
+if [ -n "${VGAPORT}" ]; then
+  grep -q 'connected$' /sys/class/drm/card*${VGAPORT}/status
+  if [ $? -eq 0 ]; then
+    grep -q '^connected$' /sys/class/drm/card*${VGAPORT}/status
+    if [ $? -ne 0 ]; then
+      echo "WARN: VGAPORT=${VGAPORT} is not connected, try to activate max ${BIT} anyway"
+    fi
+    PORT="${VGAPORT}"
+  else
+    echo "ERROR: port ${VGAPORT} not found"
+    NAMEs="$(grep -l 'connected$' /sys/class/drm/card*/status | awk -F/ '{ print $5 }' | sed -e 's|^card[^-]*-||' | tr '\n' ' ')"
+    echo "       choose one of ${NAMEs}"
+    exit 1
+  fi
+fi
+
+# find the port
+if [ -z "${PORT}" ]; then
+  PORTs=$(grep '^connected$' /sys/class/drm/card*/status | wc -l)
+  if [ "${PORTs}" = "1" ]; then
+    PORT=$(grep -l '^connected$' /sys/class/drm/card*/status | awk -F/ '{ print $5 }' | sed -e 's|^card[^-]*-||')
+  elif [ ! "${PORTs}" = "0" ]; then
+    NAMEs="$(grep -l '^connected$' /sys/class/drm/card*/status | awk -F/ '{ print $5 }' | sed -e 's|^card[^-]*-||' | tr '\n' ' ')"
+    echo "ERROR: found connected ports ${NAMEs}, autodetect works only with 1"
+  fi
+fi
+if [ -z "${PORT}" ]; then
+  echo "ERROR: could not find the VGA porti to use"
+  NAMEs="$(grep -l 'connected$' /sys/class/drm/card*/status | awk -F/ '{ print $5 }' | sed -e 's|^card[^-]*-||' | tr '\n' ' ')"
+  echo "       choose one of ${NAMEs} and run"
+  echo "       ${0} --vgaport <port>"
+  exit 1
+fi
+
+# find the connector
+CONNECTOR=$(modetest -c | grep -E "[[:space:]]${PORT}[[:space:]]" | awk '{ print $1 }')
+if [ -z "${CONNECTOR}" ]; then
+  echo "ERROR: connector id for port ${PORT} not found"
+  exit 1
+fi
+
+echo "using VGA port $PORT with connector id $CONNECTOR"
+
+# only if kodi is not running
+systemctl is-active kodi.service --quiet
+if [ $? -eq 0 ]; then
+  echo "ERROR: kodi is running, ${NOT}"
+  echo "# try the following line"
+  echo "systemctl stop kodi.service && $0 "${PARAM}" && systemctl start kodi.service"
+else
+  modetest -w ${CONNECTOR}:"max bpc":${BIT}
+fi
+