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PCI: shpchp: Request SHPC control via _OSC when adding host bridge 

The SHPC driver now must be builtin (it cannot be a module).  If it is
present, request SHPC control immediately when adding the ACPI host bridge.
This is similar to how we handle native PCIe hotplug via pciehp.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[bhelgaas: split to separate patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Mika Westerberg 2018-05-23 17:40:23 -05:00 committed by Bjorn Helgaas
parent 82280f7af7
commit 1df81a6d6e
3 changed files with 7 additions and 0 deletions
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5
drivers/acpi/pci_root.c
View File

@ -477,6 +477,9 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL;
if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL;
if (pci_aer_available()) {
if (aer_acpi_firmware_first())
dev_info(&device->dev,
@ -903,6 +906,8 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
host_bridge = to_pci_host_bridge(bus->bridge);
if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
host_bridge->native_pcie_hotplug = 0;
if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
host_bridge->native_shpc_hotplug = 0;
if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))
host_bridge->native_aer = 0;
if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))

1
drivers/pci/probe.c
View File

@ -553,6 +553,7 @@ struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
*/
bridge->native_aer = 1;
bridge->native_pcie_hotplug = 1;
bridge->native_shpc_hotplug = 1;
bridge->native_pme = 1;
return bridge;

1
include/linux/pci.h
View File

@ -475,6 +475,7 @@ struct pci_host_bridge {
unsigned int no_ext_tags:1; /* No Extended Tags */
unsigned int native_aer:1; /* OS may use PCIe AER */
unsigned int native_pcie_hotplug:1; /* OS may use PCIe hotplug */
unsigned int native_shpc_hotplug:1; /* OS may use SHPC hotplug */
unsigned int native_pme:1; /* OS may use PCIe PME */
/* Resource alignment requirements */
resource_size_t (*align_resource)(struct pci_dev *dev,