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quickboot-display: trigger weston on msm_dpu driver instead of card0 #10

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quickboot-display: trigger weston on msm_dpu driver instead of card0 #10

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19 changes: 16 additions & 3 deletions quickboot-display/files/03-drm.rules
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Original file line number Diff line number Diff line change
@@ -1,7 +1,20 @@
# Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
# SPDX-License-Identifier: BSD-3-Clause-Clear
#
# Trigger Weston immediately when the primary DRM card is detected by the kernel.
# This eliminates delays waiting for generic multi-user targets.
# Trigger Weston immediately when the primary display controller's DRM card is
# detected by the kernel. This eliminates delays waiting for generic multi-user
# targets.
#
# Match on the msm_dpu display-controller driver (DRIVERS=="msm_dpu") rather than
# a fixed KERNEL=="card0". The cardN numbering is assigned in probe order and is
# not guaranteed to be the display controller when more than one DRM device is
# present (e.g. a discrete GPU or a DP/HDMI bridge exposing its own card). The
# msm_dpu driver name is stable and board-independent across the msm display
# stack. DEVTYPE=="drm_minor" + KERNEL=="card[0-9]*" restrict the match to the
# card node itself, excluding renderD* and card*-<connector> child nodes.
#
# SYSTEMD_ALIAS exposes this node as a stable device unit
# "dev-dri-msm_dpu_card.device" so weston.service can order itself against it
# (Requires=/After=) without hardcoding the unstable cardN name.

ACTION=="add", SUBSYSTEM=="drm", KERNEL=="card0", TAG+="systemd", ENV{SYSTEMD_READY}="1", ENV{SYSTEMD_WANTS}="weston.service"
ACTION=="add", SUBSYSTEM=="drm", ENV{DEVTYPE}=="drm_minor", DRIVERS=="msm_dpu", KERNEL=="card[0-9]*", ENV{SYSTEMD_ALIAS}="/dev/dri/msm_dpu_card", TAG+="systemd", ENV{SYSTEMD_READY}="1", ENV{SYSTEMD_WANTS}="weston.service"
9 changes: 6 additions & 3 deletions quickboot-display/files/weston.service
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Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,12 @@
# Remove default dependenies (sysinit.target, basic.target) to enable early start
DefaultDependencies=no

# Start as soon as display card appear
Requires=dev-dri-card0.device
After=dev-dri-card0.device
# Start as soon as the display card appears. Order against the stable device-unit
# alias published by 03-drm.rules (SYSTEMD_ALIAS=/dev/dri/msm_dpu_card) instead of
# a hardcoded dev-dri-card0.device -- dev-dri-msm_dpu_card.device tracks the
# msm_dpu display controller regardless of its cardN enumeration.
Requires=dev-dri-msm_dpu_card.device
After=dev-dri-msm_dpu_card.device

# Since we are part of the graphical session, make sure we are started before
# it is complete.
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