From e98f6af77bbd2060f01833559034f28b8b88abfe Mon Sep 17 00:00:00 2001 From: Nico Huber Date: Sat, 21 Mar 2020 18:40:03 +0100 Subject: drivers/intel/gma/acpi: Reduce display switching stubs _DCS, _DGS and _DSS are required by specification. However, we never implemented them properly, and no OS driver com- plained yet. So we stub them out and keep the traditional behavior in case an OS driver checks for their existence. The old implementations also only returned static values as there never was any write to their GNVS variables. The TRAP() that was called in one place is actually implemented by some ThinkPad's SMI handler as docking event. However, as the call precedes these SMI handlers in coreboot history, it's most likely an accident. Change-Id: Ib0b9fcdd58df254d3b2290900e3bc206a7abd92d Signed-off-by: Nico Huber Reviewed-on: https://review.coreboot.org/c/coreboot/+/39726 Tested-by: build bot (Jenkins) Reviewed-by: HAOUAS Elyes --- src/southbridge/intel/i82801ix/acpi/globalnvs.asl | 4 ---- 1 file changed, 4 deletions(-) (limited to 'src/southbridge/intel/i82801ix/acpi') diff --git a/src/southbridge/intel/i82801ix/acpi/globalnvs.asl b/src/southbridge/intel/i82801ix/acpi/globalnvs.asl index a419fdb685..306260e58e 100644 --- a/src/southbridge/intel/i82801ix/acpi/globalnvs.asl +++ b/src/southbridge/intel/i82801ix/acpi/globalnvs.asl @@ -16,7 +16,6 @@ /* Global Variables */ Name(\PICM, 0) // IOAPIC/8259 -Name(\DSEN, 1) // Display Output Switching Enable /* Global ACPI memory region. This region is used for passing information * between coreboot (aka "the system bios"), ACPI, and the SMI handler. @@ -92,9 +91,6 @@ Field (GNVS, ByteAcc, NoLock, Preserve) TLST, 8, // 0x3d - Display Toggle List pointer CADL, 8, // 0x3e - Currently Attached Devices List PADL, 8, // 0x3f - Previously Attached Devices List - CSTE, 16, // 0x40 - Current display state - NSTE, 16, // 0x42 - Next display state - SSTE, 16, // 0x44 - Set display state Offset (0x46), NDID, 8, // 0x46 - Number of Device IDs DID1, 32, // 0x47 - Device ID 1 -- cgit v1.2.3