PCI/ACPI: Report ASPM support to BIOS if not disabled from command line
commit8b8bae901ce23addbdcdb54fa1696fb2d049feb5
authorRafael J. Wysocki <rjw@sisk.pl>
Sat, 5 Mar 2011 12:21:51 +0000 (5 13:21 +0100)
committerJesse Barnes <jbarnes@virtuousgeek.org>
Mon, 21 Mar 2011 16:38:02 +0000 (21 09:38 -0700)
tree4b95885dc5ba5b6105231289501e83ef429987c2
parenta44f99c7efdb88fa41128065c9a9445c19894e34
PCI/ACPI: Report ASPM support to BIOS if not disabled from command line

We need to distinguish the situation in which ASPM support is
disabled from the command line or through .config from the situation
in which it is disabled, because the hardware or BIOS can't handle
it.  In the former case we should not report ASPM support to the BIOS
through ACPI _OSC, but in the latter case we should do that.

Introduce pcie_aspm_support_enabled() that can be used by
acpi_pci_root_add() to determine whether or not it should report ASPM
support to the BIOS through _OSC.

Cc: stable@kernel.org
References: https://bugzilla.kernel.org/show_bug.cgi?id=29722
References: https://bugzilla.kernel.org/show_bug.cgi?id=20232
Reported-and-tested-by: Ortwin Glück <odi@odi.ch>
Reviewed-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Tested-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
drivers/acpi/pci_root.c
drivers/pci/pcie/aspm.c
include/linux/pci.h