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| author | Kristen Carlson Accardi <kristen.c.accardi@intel.com> | 2006-07-12 08:59:00 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-07-12 16:05:48 -0700 |
| commit | ffadcc2ff42ecedf71ea67d9051ff028927aed08 (patch) | |
| tree | 540351be72173f69c552c05dfeffd0804ca0bd6b /drivers/pci/pci.h | |
| parent | 6f0312fd7e0e6f96fd847b0b2e1e0d2d2e8ef89d (diff) | |
| download | lwn-ffadcc2ff42ecedf71ea67d9051ff028927aed08.tar.gz lwn-ffadcc2ff42ecedf71ea67d9051ff028927aed08.zip | |
[PATCH] PCI: PCIE power management quirk
When changing power states from D0->DX and then from DX->D0, some
Intel PCIE chipsets will cause a device reset to occur. This will
cause problems for any D State other than D3, since any state
information that the driver will expect to be present coming from
a D1 or D2 state will have been cleared. This patch addes a
flag to the pci_dev structure to indicate that devices should
not use states D1 or D2, and will set that flag for the affected
chipsets. This patch also modifies pci_set_power_state() so that
when a device driver tries to set the power state on
a device that is downstream from an affected chipset, or on one
of the affected devices it only allows state changes to or
from D0 & D3. In addition, this patch allows the delay time
between D3->D0 to be changed via a quirk. These chipsets also
need additional time to change states beyond the normal 10ms.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 9cc842b666eb..08d58fc78ee1 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -47,7 +47,7 @@ extern int pci_msi_quirk; #else #define pci_msi_quirk 0 #endif - +extern unsigned int pci_pm_d3_delay; #ifdef CONFIG_PCI_MSI void disable_msi_mode(struct pci_dev *dev, int pos, int type); void pci_no_msi(void); @@ -66,7 +66,15 @@ static inline int pci_save_msix_state(struct pci_dev *dev) { return 0; } static inline void pci_restore_msi_state(struct pci_dev *dev) {} static inline void pci_restore_msix_state(struct pci_dev *dev) {} #endif +static inline int pci_no_d1d2(struct pci_dev *dev) +{ + unsigned int parent_dstates = 0; + if (dev->bus->self) + parent_dstates = dev->bus->self->no_d1d2; + return (dev->no_d1d2 || parent_dstates); + +} extern int pcie_mch_quirk; extern struct device_attribute pci_dev_attrs[]; extern struct class_device_attribute class_device_attr_cpuaffinity; |