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author | Lukas Wunner <lukas@wunner.de> | 2016-10-28 11:52:06 +0300 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-11-18 03:47:58 +0300 |
commit | 437eb7bf7b28472f8b7689e166dc1dd691367121 (patch) | |
tree | 38424a7a9621aef9217a38d4c34812cce9595a9b /drivers/gpio/gpio-max732x.c | |
parent | 6ef13824e0d897858ea4510a2c61b00445922fad (diff) | |
download | linux-437eb7bf7b28472f8b7689e166dc1dd691367121.tar.xz |
ACPI / hotplug / PCI: Make device_is_managed_by_native_pciehp() public
We're about to add runtime PM of hotplug ports, but we need to restrict it
to ports that are handled natively by the OS: If they're handled by the
firmware (which is the case for Thunderbolt on non-Macs), things would
break if the OS put the ports into D3hot behind the firmware's back.
To determine if a hotplug port is handled natively, one has to walk up from
the port to the root bridge and check the cached _OSC Control Field for the
value of the "PCI Express Native Hot Plug control" bit. There's already a
function to do that, device_is_managed_by_native_pciehp(), but it's private
to drivers/pci/hotplug/acpiphp_glue.c and only compiled in if
CONFIG_HOTPLUG_PCI_ACPI is enabled.
Make it public and move it to drivers/pci/pci-acpi.c, so that it is
available in the more general CONFIG_ACPI case.
The function contains a check if the device in question is a hotplug port
and returns false if it's not. The caller we're going to add doesn't need
this as it only calls the function if it actually *is* a hotplug port.
Move the check out of the function into the single existing caller.
Rename it to pciehp_is_native() and add some kerneldoc and polish.
No functional change intended.
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/gpio/gpio-max732x.c')
0 files changed, 0 insertions, 0 deletions