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| author | Denis 'GNUtoo' Carikli <GNUtoo@no-log.org> | 2013-03-28 14:24:39 +0100 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2013-04-18 02:48:02 +0200 |
| commit | 4b213a8d1fd02061c1e879ff98167bcb47f13bd2 (patch) | |
| tree | 215a6f770ba95890c174b8b403d00ca7414481c2 | |
| parent | ab348528b58e987994eb783a7622404515a18cd8 (diff) | |
Intel i945: ACPI: Add _OSC method
Add the ACPI Operating System Capabilities Method and let the
operation system control everything.
Commit »AMD Fam14 DSDT: Add OSC method« (00a0e76b) [1] is used as
a template.
The Lenovo X60 [2] running the Parabola GNU/Linux distribution [3] is
used for testing.
Before that change:
$ dmesg | egrep -e OSC -e ASPM
[ 0.108036] pci_root PNP0A08:00: ACPI _OSC support notification failed, disabling PCIe ASPM
[ 0.108040] pci_root PNP0A08:00: Unable to request _OSC control (_OSC support mask: 0x08)
[ 0.118089] ACPI _OSC control for PCIe not granted, disabling ASPM
[ 16.874569] e1000e 0000:01:00.0: Disabling ASPM L0s L1
With that change:
$ dmesg | egrep -e OSC -e ASPM
[ 0.107962] pci_root PNP0A08:00: Requesting ACPI _OSC control (0x1d)
[ 0.108003] pci_root PNP0A08:00: ACPI _OSC control (0x1d) granted
[ 0.111052] pci 0000:01:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
[ 17.537970] e1000e 0000:01:00.0: Disabling ASPM L0s L1
[1] http://review.coreboot.org/2738
[2] http://www.coreboot.org/Lenovo_x60x
[3] https://parabolagnulinux.org/
Change-Id: I1caffa44eea447d553c01caaf431f2db241ea5ea
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/2938
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
| -rw-r--r-- | src/northbridge/intel/i945/acpi/i945.asl | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/northbridge/intel/i945/acpi/i945.asl b/src/northbridge/intel/i945/acpi/i945.asl index 47a6931c67..6a34b94535 100644 --- a/src/northbridge/intel/i945/acpi/i945.asl +++ b/src/northbridge/intel/i945/acpi/i945.asl @@ -22,6 +22,25 @@ #include "hostbridge.asl" #include "../i945.h" +/* Operating System Capabilities Method */ +Method (_OSC, 4) +{ + // Create DWord-addressable fields from the Capabilities Buffer + CreateDWordField(Arg3, 0, CDW1) + CreateDWordField(Arg3, 4, CDW2) + CreateDWordField(Arg3, 8, CDW3) + + /* Check for proper PCI/PCIe UUID */ + If (LEqual(Arg0, ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766"))) + { + /* Let OS control everything */ + Return(Arg3) + } Else { + Or(CDW1, 4, CDW1) // Unrecognized UUID, so set bit 2 to 1 + Return(Arg3) + } +} + /* PCI Device Resource Consumption */ Device (PDRC) { |