From 7790cb680a58bf2a5c869dadbb23fbd6bd680f7d Mon Sep 17 00:00:00 2001 From: Matt DeVillier Date: Sun, 15 Mar 2020 17:11:18 -0500 Subject: sb/lynxpoint/gpio: fix interrupt storm On newer kernels (> 4.9 LTS), the GPIO ACPI device's interrupt resource causes an interrupt storm which prevents the CPU from properly idling, significantly increasing power consumption. This was fixed for soc/broadwell (which also supports lynxpoint-lp) by removing the interrupt resource, so apply the same fix here. Original fix: https://chromium-review.googlesource.com/203645 Test: build/boot google/wolf, verify CPU0 idles correctly and power consumption drop via powertop in kernels 4.16.18 and 5.x. Change-Id: Ic4963f2f0225b5f44a7604b0107911640345c855 Signed-off-by: Matt DeVillier Reviewed-on: https://review.coreboot.org/c/coreboot/+/39578 Tested-by: build bot (Jenkins) Reviewed-by: Angel Pons --- src/southbridge/intel/lynxpoint/acpi/serialio.asl | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'src/southbridge/intel/lynxpoint/acpi') diff --git a/src/southbridge/intel/lynxpoint/acpi/serialio.asl b/src/southbridge/intel/lynxpoint/acpi/serialio.asl index 88138a1d61..2a3c096099 100644 --- a/src/southbridge/intel/lynxpoint/acpi/serialio.asl +++ b/src/southbridge/intel/lynxpoint/acpi/serialio.asl @@ -551,8 +551,9 @@ Device (GPIO) , // ResourceSourceIndex , // ResourceSource BAR0) - Interrupt (ResourceConsumer, - Level, ActiveHigh, Shared, , ,) {14} + // Disabled due to IRQ storm: http://crosbug.com/p/29548 + //Interrupt (ResourceConsumer, + // Level, ActiveHigh, Shared, , , ) {14} }) Method (_CRS, 0, NotSerialized) -- cgit v1.2.3