From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> As per PCI Firmware Specification, r3.2 ECN (https://members.pcisig.com/wg/PCI-SIG/document/12614), if OS supports EDR, it should expose its support to BIOS by setting bit 7 of _OSC Support Field. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> --- drivers/acpi/pci_root.c | 3 +++ include/linux/acpi.h | 3 ++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index a60261e50b08..aeb3fcc40e2f 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -145,6 +145,7 @@ 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" }, }; static struct pci_osc_bit_struct pci_osc_control_bit[] = { @@ -453,6 +454,8 @@ 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 f68e9513996b..c60b7d72e526 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -513,7 +513,8 @@ 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_SUPPORT_MASKS 0x0000001f +#define OSC_PCI_EDR_SUPPORT 0x00000080 +#define OSC_PCI_SUPPORT_MASKS 0x000000ff /* PCI Host Bridge _OSC: Capabilities DWORD 3: Control Field */ #define OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 0x00000001 -- 2.20.1
