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x86/mrst/pci: assign d3_delay to 0 for Langwell devices

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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>
This commit is contained in:
Jacob Pan 2012-02-13 12:59:00 +00:00 committed by Jesse Barnes
parent 7570a333d8
commit 990a30c50c
1 changed files with 24 additions and 0 deletions
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24
arch/x86/pci/mrst.c
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@ -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.
*/