diff options
| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2012-02-13 12:59:00 +0000 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2012-02-23 12:31:36 -0800 |
| commit | 990a30c50c2bb3c4570aec7c33bedb969d089b7b (patch) | |
| tree | 4c1dbd9c61b99b74d527a401340bf6897a1f916b /arch/x86/pci | |
| parent | 7570a333d8b00e7fd4b05d898e353000a70210ce (diff) | |
x86/mrst/pci: assign d3_delay to 0 for Langwell devices
Langwell devices are not true pci devices, they are not subject to the 10 ms
d3 to d0 delay required by pci spec. This patch assigns d3_delay to 0 for all
langwell pci devices.
We can also power off devices that are not really used by the OS
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/x86/pci')
| -rw-r--r-- | arch/x86/pci/mrst.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c index cb29191cee5..89e55485c78 100644 --- a/arch/x86/pci/mrst.c +++ b/arch/x86/pci/mrst.c @@ -239,6 +239,30 @@ int __init pci_mrst_init(void) return 1; } +/* Langwell devices are not true pci devices, they are not subject to 10 ms + * d3 to d0 delay required by pci spec. + */ +static void __devinit pci_d3delay_fixup(struct pci_dev *dev) +{ + /* true pci devices in lincroft should allow type 1 access, the rest + * are langwell fake pci devices. + */ + if (type1_access_ok(dev->bus->number, dev->devfn, PCI_DEVICE_ID)) + return; + dev->d3_delay = 0; +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_d3delay_fixup); + +static void __devinit mrst_power_off_unused_dev(struct pci_dev *dev) +{ + pci_set_power_state(dev, PCI_D3cold); +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0801, mrst_power_off_unused_dev); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0809, mrst_power_off_unused_dev); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x080C, mrst_power_off_unused_dev); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0812, mrst_power_off_unused_dev); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0815, mrst_power_off_unused_dev); + /* * Langwell devices reside at fixed offsets, don't try to move them. */ |