From c7f486567c1d0acd2e4166c47069835b9f75e77b Mon Sep 17 00:00:00 2001 From: Rafael J. Wysocki Date: Wed, 17 Feb 2010 23:39:08 +0100 Subject: PCI PM: PCIe PME root port service driver PCIe native PME detection mechanism is based on interrupts generated by root ports or event collectors every time a PCIe device sends a PME message upstream. Once a PME message has been sent by an endpoint device and received by its root port (or event collector in the case of root complex integrated endpoints), the Requester ID from the message header is registered in the root port's Root Status register. At the same time, the PME Status bit of the Root Status register is set to indicate that there's a PME to handle. If PCIe PME interrupt is enabled for the root port, it generates an interrupt once the PME Status has been set. After receiving the interrupt, the kernel can identify the PCIe device that generated the PME using the Requester ID from the root port's Root Status register. [For details, see PCI Express Base Specification, Rev. 2.0.] Implement a driver for the PCIe PME root port service working in accordance with the above description. Based on a patch from Shaohua Li . Signed-off-by: Rafael J. Wysocki Signed-off-by: Jesse Barnes --- drivers/pci/pcie/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/pci/pcie/Kconfig') diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig index 5a0c6ad53f8e..b8b494b3e0d0 100644 --- a/drivers/pci/pcie/Kconfig +++ b/drivers/pci/pcie/Kconfig @@ -46,3 +46,7 @@ config PCIEASPM_DEBUG help This enables PCI Express ASPM debug support. It will add per-device interface to control ASPM. + +config PCIE_PME + def_bool y + depends on PCIEPORTBUS && PM_RUNTIME && EXPERIMENTAL && ACPI -- cgit v1.2.3-55-g7522