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authorJacob Pan <jacob.jun.pan@linux.intel.com>2012-02-13 12:59:00 +0000
committerJesse Barnes <jbarnes@virtuousgeek.org>2012-02-23 12:31:36 -0800
commit990a30c50c2bb3c4570aec7c33bedb969d089b7b (patch)
tree4c1dbd9c61b99b74d527a401340bf6897a1f916b
parent7570a333d8b00e7fd4b05d898e353000a70210ce (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>
-rw-r--r--arch/x86/pci/mrst.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
index cb29191cee58..89e55485c787 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.
*/