weston-init: Launch weston with WESTON_DISABLE_ATOMIC on musl/x86

Since we enabled drm/kms backend for qemux86, it does not work with musl
fdbdev worked ok, we see this error

[18:58:45.628] launching '/usr/libexec/weston-desktop-shell'
[18:58:45.737] atomic: couldn't commit new state: Invalid argument
[18:58:45.737] repaint-flush failed: Invalid argument

There seems to be some problem with atomics in libdrm, until that gets
diagnosed, simple solution is to not use it on musl when drm backend is used
thats why WESTON_DISABLE_ATOMIC=Y is set in environment file for such
cases

(From OE-Core rev: e571ef707d76cf3aceb0d56fd588b37f9b5092ff)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/wayland/weston-init.bb

@@ -5,6 +5,7 @@ LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384
 PACKAGE_ARCH = "${MACHINE_ARCH}"
 
 SRC_URI = "file://init \
+           file://weston.env \
            file://weston.ini \
            file://weston@.service \
            file://71-weston-drm.rules \
@@ -15,6 +16,7 @@ S = "${WORKDIR}"
 do_install() {
 	install -Dm755 ${WORKDIR}/init ${D}/${sysconfdir}/init.d/weston
 	install -D -p -m0644 ${WORKDIR}/weston.ini ${D}${sysconfdir}/xdg/weston/weston.ini
+	install -Dm644 ${WORKDIR}/weston.env ${D}${sysconfdir}/default/weston
 
 	# Install Weston systemd service and accompanying udev rule
 	install -D -p -m0644 ${WORKDIR}/weston@.service ${D}${systemd_system_unitdir}/weston@.service
@@ -30,6 +32,14 @@ do_install() {
 	sed -i 's,@LOCALSTATEDIR@,${localstatedir},g' ${D}${bindir}/weston-start
 }
 
+do_install_append_libc-musl_qemux86() {
+        echo "WESTON_DISABLE_ATOMIC=Y" >> ${D}${sysconfdir}/default/weston
+}
+
+do_install_append_libc-musl_qemux86-64() {
+        echo "WESTON_DISABLE_ATOMIC=Y" >> ${D}${sysconfdir}/default/weston
+}
+
 inherit update-rc.d features_check systemd
 
 # rdepends on weston which depends on virtual/egl
@@ -40,9 +50,9 @@ RDEPENDS_${PN} = "weston kbd"
 INITSCRIPT_NAME = "weston"
 INITSCRIPT_PARAMS = "start 9 5 2 . stop 20 0 1 6 ."
 
-FILES_${PN} += "${sysconfdir}/xdg/weston/weston.ini ${systemd_system_unitdir}/weston@.service"
+FILES_${PN} += "${sysconfdir}/xdg/weston/weston.ini ${systemd_system_unitdir}/weston@.service ${sysconfdir}/default/weston"
 
-CONFFILES_${PN} += "${sysconfdir}/xdg/weston/weston.ini"
+CONFFILES_${PN} += "${sysconfdir}/xdg/weston/weston.ini ${sysconfdir}/default/weston"
 
 SYSTEMD_SERVICE_${PN} = "weston@%i.service"
 SYSTEMD_AUTO_ENABLE = "disable"