From 1c7ba62eb75186111bc72a4e6fc958ef09e078f7 Mon Sep 17 00:00:00 2001 From: Angel Pons Date: Thu, 29 Oct 2020 00:01:29 +0100 Subject: cpu/intel/haswell: Set C9/C10 vccmin MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Backport commit ab7586fa26 (broadwell: Set C9/C10 vccmin) to Haswell. Change-Id: I9cddc7dd45e96c6f99327ee2583917bf8bedfbdd Signed-off-by: Angel Pons Reviewed-on: https://review.coreboot.org/c/coreboot/+/46922 Reviewed-by: Michael Niewöhner Reviewed-by: Arthur Heymans Tested-by: build bot (Jenkins) --- src/cpu/intel/haswell/haswell_init.c | 23 +++++++++++++++++++++++ src/northbridge/intel/haswell/registers/mchbar.h | 3 +++ 2 files changed, 26 insertions(+) (limited to 'src') diff --git a/src/cpu/intel/haswell/haswell_init.c b/src/cpu/intel/haswell/haswell_init.c index b1f8bba815..04f58026ae 100644 --- a/src/cpu/intel/haswell/haswell_init.c +++ b/src/cpu/intel/haswell/haswell_init.c @@ -226,6 +226,26 @@ static u32 pcode_mailbox_read(u32 command) return MCHBAR32(BIOS_MAILBOX_DATA); } +static int pcode_mailbox_write(u32 command, u32 data) +{ + if (pcode_ready() < 0) { + printk(BIOS_ERR, "PCODE: mailbox timeout on wait ready.\n"); + return -1; + } + + MCHBAR32(BIOS_MAILBOX_DATA) = data; + + /* Send command and start transaction */ + MCHBAR32(BIOS_MAILBOX_INTERFACE) = command | MAILBOX_RUN_BUSY; + + if (pcode_ready() < 0) { + printk(BIOS_ERR, "PCODE: mailbox timeout on completion.\n"); + return -1; + } + + return 0; +} + static void initialize_vr_config(void) { struct cpu_vr_config vr_config = { 0 }; @@ -300,6 +320,9 @@ static void initialize_vr_config(void) else msr.lo |= 0x006f; /* 1.60V */ wrmsr(MSR_VR_MISC_CONFIG2, msr); + + /* Set C9/C10 VCC Min */ + pcode_mailbox_write(MAILBOX_BIOS_CMD_WRITE_C9C10_VOLTAGE, 0x1f1f); } static void configure_pch_power_sharing(void) diff --git a/src/northbridge/intel/haswell/registers/mchbar.h b/src/northbridge/intel/haswell/registers/mchbar.h index 4bdb49a370..a61036aca3 100644 --- a/src/northbridge/intel/haswell/registers/mchbar.h +++ b/src/northbridge/intel/haswell/registers/mchbar.h @@ -46,6 +46,9 @@ #define MAILBOX_BIOS_CMD_FSM_MEASURE_INTVL 0x909 #define MAILBOX_BIOS_CMD_READ_PCH_POWER 0xa #define MAILBOX_BIOS_CMD_READ_PCH_POWER_EXT 0xb +#define MAILBOX_BIOS_CMD_READ_C9C10_VOLTAGE 0x26 +#define MAILBOX_BIOS_CMD_WRITE_C9C10_VOLTAGE 0x27 + /* Errors are returned back in bits 7:0 */ #define MAILBOX_BIOS_ERROR_NONE 0 #define MAILBOX_BIOS_ERROR_INVALID_COMMAND 1 -- cgit v1.2.3