diff options
Diffstat (limited to 'src/cpu/intel/haswell')
| -rw-r--r-- | src/cpu/intel/haswell/haswell_init.c | 23 |
1 files changed, 23 insertions, 0 deletions
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) |