[PATCH v5 0/3] Support power resources defined in acpi on ata

[Markus Probst]

This series adds support for power resources defined in acpi on ata
ports/devices. A device can define a power resource in an ata port/device,
which then gets powered on right before the port is probed. This can be
useful for devices, which have sata power connectors that are:
  a: powered down by default
  b: can be individually powered on
like in some synology nas devices. If thats the case it will be assumed,
that the power resource won't survive reboots and therefore the disk will
be stopped.

Changes since v4:
- improved documentation
- use false/true instead of 0/1
- removed repeating code in ata_acpi_dev_manage_restart
- split long lines
- removed debug message
- improved error message

Changes since v3:
- rename function from "ata_port_set_power_state"
  to "ata_acpi_port_power_on" and remove enable argument
- split "ata_acpi_port_power_on" and "ata_acpi_dev_manage_restart" into
  two commits
- improved commit messages
- improved comments (style and new comments)

Changes since v2:
- improved commit messages
- addressed warning from kernel test robot

Changes since v1:
- improved commit messages
- addressed style issues (too long lines and docs)
- removed ata_dev_manage_restart() and ata_port_set_power_state()
  methods
- improved log messages in ata_acpi_port_set_power_state


Markus Probst (3):
  scsi: sd: Add manage_restart device attribute to scsi_disk
  ata: stop disk on restart if ACPI power resources are found
  ata: Use ACPI methods to power on disks

 drivers/ata/libata-acpi.c  | 66 ++++++++++++++++++++++++++++++++++++++
 drivers/ata/libata-core.c  |  2 ++
 drivers/ata/libata-scsi.c  |  1 +
 drivers/ata/libata.h       |  4 +++
 drivers/scsi/sd.c          | 35 +++++++++++++++++++-
 include/scsi/scsi_device.h |  6 ++++
 6 files changed, 113 insertions(+), 1 deletion(-)

-- 
2.51.0