openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

PCI/ACPI: Run _OSC only once for OSPM feature support 

Previously, we ran _OSC once to tell the platform that we support
PCI Segment Groups, then we ran it again if we supported any additional
features (ASPM, MSI, or extended config space).  I don't think it's
necessary to run it twice, since we can easily build the complete
mask of features we support before running _OSC the first time.

We run _OSC again later when requesting control of PCIe features;
that's unaffected by this change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bjorn Helgaas 2013-09-05 15:07:42 -06:00
parent b8eb67fcc4
commit 1b2a7be60e
1 changed files with 7 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/acpi/pci_root.c
View File

@ -373,16 +373,12 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
* PCI domains, so we indicate this in _OSC support capabilities.
*/
support = base_support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
acpi_pci_osc_support(root, support);
if (pci_ext_cfg_avail())
support |= OSC_PCI_EXT_CONFIG_SUPPORT;
if (pcie_aspm_support_enabled()) {
if (pcie_aspm_support_enabled())
support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
}
if (pci_msi_enabled())
support |= OSC_PCI_MSI_SUPPORT;
if (support != base_support) {
status = acpi_pci_osc_support(root, support);
if (ACPI_FAILURE(status)) {
dev_info(&device->dev, "ACPI _OSC support "
@ -390,7 +386,6 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
*no_aspm = 1;
support = base_support;
}
}
if (!pcie_ports_disabled
&& (support & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {