From da8380bbbe90f69bec4be69af4d0deb7cf2bbcfe Mon Sep 17 00:00:00 2001 From: Terry Bowman Date: Thu, 1 Dec 2022 13:34:27 -0800 Subject: cxl/acpi: Set ACPI's CXL _OSC to indicate RCD mode support ACPI uses the CXL _OSC support method to communicate the available CXL functionality to FW. The CXL _OSC support method includes a field to indicate the OS is capable of RCD mode. FW can potentially change it's operation depending on the _OSC support method reported by the OS. The ACPI driver currently only sets the ACPI _OSC support method to indicate CXL VH mode. Change the capability reported to also include CXL RCD mode. [1] CXL3.0 Table 9-26 'Interpretation of CXL _OSC Support Field' Signed-off-by: Terry Bowman [rrichter@amd.com: Reworded patch description.] Signed-off-by: Robert Richter Link: http://lore.kernel.org/r/Y4cRV/Sj0epVW7bE@rric.localdomain Link: https://lore.kernel.org/r/166993046717.1882361.10587956243041624761.stgit@dwillia2-xfh.jf.intel.com Reviewed-by: Jonathan Cameron Signed-off-by: Dan Williams --- drivers/acpi/pci_root.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/acpi/pci_root.c') diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 4e3db20e9cbb..b3c202d2a433 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -493,6 +493,7 @@ static u32 calculate_cxl_support(void) u32 support; support = OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT; + support |= OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT; if (pci_aer_available()) support |= OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT; if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) -- cgit v1.2.3-70-g09d2