From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
As per PCI firmware specification r3.2 Downstream Port Containment
Related Enhancements ECN, sec 4.5.1, table 4-4, if OS supports EDR,
it should expose its support to BIOS by setting bit 7 of _OSC Support
Field.
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 3 +++
include/linux/acpi.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 73b08f40b0da..988d09d788b6 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -132,6 +132,7 @@ static struct pci_osc_bit_struct pci_osc_support_bit[] = {
{ OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
{ OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
{ OSC_PCI_MSI_SUPPORT, "MSI" },
+ { OSC_PCI_EDR_SUPPORT, "EDR" },
{ OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
};
@@ -442,6 +443,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
if (pci_msi_enabled())
support |= OSC_PCI_MSI_SUPPORT;
+ if (IS_ENABLED(CONFIG_PCIE_EDR))
+ support |= OSC_PCI_EDR_SUPPORT;
decode_osc_support(root, "OS supports", support);
status = acpi_pci_osc_support(root, support);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 8959ed322e15..b6b43da85d26 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -515,6 +515,7 @@ extern bool osc_pc_lpi_support_confirmed;
#define OSC_PCI_CLOCK_PM_SUPPORT 0x00000004
#define OSC_PCI_SEGMENT_GROUPS_SUPPORT 0x00000008
#define OSC_PCI_MSI_SUPPORT 0x00000010
+#define OSC_PCI_EDR_SUPPORT 0x00000080
#define OSC_PCI_HPX_TYPE_3_SUPPORT 0x00000100
#define OSC_PCI_SUPPORT_MASKS 0x0000011f
--
2.21.0
