From 836db26b1cd5ebf712f0e847e6f3db87f1204fa2 Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Wed, 3 Oct 2012 19:23:11 -0700 Subject: ACPI: Zero pstate/cstate control values in FADT If these values are non-zero then the kernel will issue an SMI for each core (cstate) and package (pstate). Since we don't do anything with these SMI callbacks we can avoid taking the extra SMIs at boot time by zeroing these fields. Change-Id: I3bc5fe0a9f45141d46884cb77ecdfaeaa45d2439 Signed-off-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/1769 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/mainboard/intel/emeraldlake2/fadt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/mainboard/intel/emeraldlake2') diff --git a/src/mainboard/intel/emeraldlake2/fadt.c b/src/mainboard/intel/emeraldlake2/fadt.c index ff840c0910..315cb5895e 100644 --- a/src/mainboard/intel/emeraldlake2/fadt.c +++ b/src/mainboard/intel/emeraldlake2/fadt.c @@ -47,7 +47,7 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt) fadt->acpi_enable = APM_CNT_ACPI_ENABLE; fadt->acpi_disable = APM_CNT_ACPI_DISABLE; fadt->s4bios_req = 0x0; - fadt->pstate_cnt = APM_CNT_PST_CONTROL; + fadt->pstate_cnt = 0; fadt->pm1a_evt_blk = pmbase; fadt->pm1b_evt_blk = 0x0; @@ -65,7 +65,7 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt) fadt->gpe0_blk_len = 16; fadt->gpe1_blk_len = 0; fadt->gpe1_base = 0; - fadt->cst_cnt = APM_CNT_CST_CONTROL; + fadt->cst_cnt = 0; fadt->p_lvl2_lat = 1; fadt->p_lvl3_lat = 87; fadt->flush_size = 1024; -- cgit v1.2.3