Commit 990a30c5 authored by Jacob Pan's avatar Jacob Pan Committed by Jesse Barnes
Browse files

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: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 7570a333

arch/x86/pci/mrst.c

+24 −0
Original line number Diff line number Diff line
@@ -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.

 */

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