| #!/bin/sh |
| |
| # Copyright 2019 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| # This script configures link power management for sata devices. It is executed |
| # at boot time when a scsi controller is found. |
| # |
| # Return success if it is ok to use min_power link power management setting. |
| |
| . /usr/share/misc/chromeos-common.sh |
| . /usr/sbin/write_gpt.sh |
| |
| load_base_vars |
| |
| device="$1" |
| drive="$(get_fixed_dst_drive)" |
| |
| if [ -z "${drive}" ]; then |
| # Root device could not be located." |
| exit 0 |
| fi |
| |
| dev_sysfs="/sys/block/${drive##*/}" |
| dev_sysfs_full_path="/sys/block/$(readlink "${dev_sysfs}")" |
| link_pm_path_glob="$(echo "${dev_sysfs_full_path}" | \ |
| sed 's|target.*|scsi_host/host*/link_power_management_policy|')" |
| # No "" inside, link_pm_path_glob has wildcard. |
| link_pm_path="$(echo ${link_pm_path_glob})" |
| |
| if ! echo "${link_pm_path}" | grep -qF "${device}"; then |
| # Disable unused link, we don't expect hot-plug. |
| exit 0 |
| elif grep -q "TS.*MTS400" "${dev_sysfs}/device/model"; then |
| # Transcend SSD have issues with DLPM: b:115398975 |
| exit 1 |
| else |
| exit 0 |
| fi |
