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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2010-12-19 15:57:16 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-12-23 21:54:03 +0100 |
| commit | fe31e69740eddc7316071ed5165fed6703c8cd12 (patch) | |
| tree | b58f193d7176bfe19ae975fec7ff42d7e242e359 /drivers/pci/pcie/portdrv.h | |
| parent | PCI: pci-stub: ignore zero-length id parameters (diff) | |
| download | linux-fe31e69740eddc7316071ed5165fed6703c8cd12.tar.xz linux-fe31e69740eddc7316071ed5165fed6703c8cd12.zip | |
PCI/PCIe: Clear Root PME Status bits early during system resume
I noticed that PCI Express PMEs don't work on my Toshiba Portege R500
after the system has been woken up from a sleep state by a PME
(through Wake-on-LAN). After some investigation it turned out that
the BIOS didn't clear the Root PME Status bit in the root port that
received the wakeup PME and since the Requester ID was also set in
the port's Root Status register, any subsequent PMEs didn't trigger
interrupts.
This problem can be avoided by clearing the Root PME Status bits in
all PCI Express root ports during early resume. For this purpose,
add an early resume routine to the PCIe port driver and make this
driver be always registered, even if pci_ports_disable is set (in
which case the driver's only function is to provide the early
resume callback).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pcie/portdrv.h')
| -rw-r--r-- | drivers/pci/pcie/portdrv.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h index 7b5aba0a3291..8fcc03598b29 100644 --- a/drivers/pci/pcie/portdrv.h +++ b/drivers/pci/pcie/portdrv.h @@ -35,6 +35,8 @@ extern void pcie_port_bus_unregister(void); struct pci_dev; +extern void pcie_clear_root_pme_status(struct pci_dev *dev); + #ifdef CONFIG_PCIE_PME extern bool pcie_pme_msi_disabled; |