forked from luck/tmp_suning_uos_patched
3c75e23784
According to the PCI Firmware Specification Revision 3.0 section 4.5, _OSC should only be called on a root brdige. Here is the relevant passage: "The _OSC interface defined in this section applies only to Host Bridge ACPI devices that originate PCI, PCI-X, or PCI Express hierarchies". Changed the code to find the parent root bridge of the device and call _OSC on that. Signed-off-by: Andrew Patterson <andrew.patterson@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Access ACPI _OSC method
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*
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* Copyright (C) 2006 Intel Corp.
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* Tom Long Nguyen (tom.l.nguyen@intel.com)
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* Zhang Yanmin (yanmin.zhang@intel.com)
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*
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/pm.h>
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#include <linux/suspend.h>
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#include <linux/acpi.h>
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#include <linux/pci-acpi.h>
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#include <linux/delay.h>
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#include "aerdrv.h"
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/**
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* aer_osc_setup - run ACPI _OSC method
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* @pciedev: pcie_device which AER is being enabled on
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*
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* @return: Zero on success. Nonzero otherwise.
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*
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* Invoked when PCIE bus loads AER service driver. To avoid conflict with
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* BIOS AER support requires BIOS to yield AER control to OS native driver.
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**/
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int aer_osc_setup(struct pcie_device *pciedev)
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{
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acpi_status status = AE_NOT_FOUND;
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struct pci_dev *pdev = pciedev->port;
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acpi_handle handle = 0;
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/* Find root host bridge */
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while (pdev->bus && pdev->bus->self)
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pdev = pdev->bus->self;
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handle = acpi_get_pci_rootbridge_handle(
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pci_domain_nr(pdev->bus), pdev->bus->number);
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if (handle) {
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pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
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status = pci_osc_control_set(handle,
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OSC_PCI_EXPRESS_AER_CONTROL |
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OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
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}
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if (ACPI_FAILURE(status)) {
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printk(KERN_DEBUG "AER service couldn't init device %s - %s\n",
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pciedev->device.bus_id,
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(status == AE_SUPPORT || status == AE_NOT_FOUND) ?
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"no _OSC support" : "Run ACPI _OSC fails");
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return -1;
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}
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return 0;
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}
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