From c9ffa5a586a97da4d552f89b8f39eea79a63a612 Mon Sep 17 00:00:00 2001 From: Kenji Kaneshige Date: Wed, 17 Dec 2008 12:07:38 +0900 Subject: PCI: pciehp: add ACPI based slot detection There is a problem that some non hot-pluggable PCIe slots are detected as hot-pluggable by pciehp on some platforms. The immediate cause of this problem is that hot-plug capable bit in the Slot Capabilities register is set even for non hot-pluggable slots on those platforms. It seems a BIOS/hardware problem, but we need workaround about that. Some of those platforms define hot-pluggable PCIe slots on ACPI namespace properly, while hot-plug capable bit in the Slot Capabilities register is set improperly. So using ACPI namespace information in pciehp to detect PCIe hot-pluggable slots would be a workaround. This patch adds 'pciehp_detect_mode' module option. When 'acpi' is specified, pciehp uses ACPI namespace information to detect PCIe hot-pluggable slots. Signed-off-by: Kenji Kaneshige Signed-off-by: Jesse Barnes --- drivers/pci/hotplug/pciehp.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'drivers/pci/hotplug/pciehp.h') diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index b2801a7ee37f..27fd18f019f8 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -220,11 +220,23 @@ struct hpc_ops { #include #include +extern void __init pciehp_acpi_slot_detection_init(void); +extern int pciehp_acpi_slot_detection_check(struct pci_dev *dev); + +static inline void pciehp_firmware_init(void) +{ + pciehp_acpi_slot_detection_init(); +} + static inline int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev) { + int retval; u32 flags = (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); - return acpi_get_hp_hw_control_from_firmware(dev, flags); + retval = acpi_get_hp_hw_control_from_firmware(dev, flags); + if (retval) + return retval; + return pciehp_acpi_slot_detection_check(dev); } static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev, @@ -235,6 +247,7 @@ static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev, return 0; } #else +#define pciehp_firmware_init() do {} while (0) #define pciehp_get_hp_hw_control_from_firmware(dev) 0 #define pciehp_get_hp_params_from_firmware(dev, hpp) (-ENODEV) #endif /* CONFIG_ACPI */ -- cgit v1.2.3