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-rw-r--r--src/soc/intel/broadwell/cpu.c23
-rw-r--r--src/soc/intel/broadwell/include/soc/systemagent.h2
2 files changed, 25 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/cpu.c b/src/soc/intel/broadwell/cpu.c
index 9073241e30..984ff7658a 100644
--- a/src/soc/intel/broadwell/cpu.c
+++ b/src/soc/intel/broadwell/cpu.c
@@ -178,6 +178,26 @@ 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)
{
device_t dev = SA_DEV_ROOT;
@@ -238,6 +258,9 @@ 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/soc/intel/broadwell/include/soc/systemagent.h b/src/soc/intel/broadwell/include/soc/systemagent.h
index 5142b09e0a..325a4a5a6c 100644
--- a/src/soc/intel/broadwell/include/soc/systemagent.h
+++ b/src/soc/intel/broadwell/include/soc/systemagent.h
@@ -115,6 +115,8 @@
#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