Patch set updated for coreboot: soc/intel/skylake: Add option to indicate voltage margining enabled/disabled

[Rizwan Qureshi]

Rizwan Qureshi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18469

-gerrit

commit 0d8b304e1657e7f27852334f9684fd84531b868f
Author: Rizwan Qureshi 
Date:   Thu Feb 23 14:43:39 2017 +0530

soc/intel/skylake: Add option to indicate voltage margining enabled/disabled

Support for voltage margining is dependent on the platform. Enbaling voltage
    margining puts additional constraints for the SLP_S0# to be asserted and hence
    moving to S0ix state. If the platform PMIC/VR supports PCH voltage reduction,
    voltage marigining can be enabled.

Use the UPD provided by FSP to enable/disable voltage margining.

Change-Id: Iea214e9d7d6126e8367426485c6446ced63caa66
    Signed-off-by: Rizwan Qureshi 
---
 src/soc/intel/skylake/chip.h       | 8 ++++++++
 src/soc/intel/skylake/chip_fsp20.c | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/src/soc/intel/skylake/chip.h b/src/soc/intel/skylake/chip.h
index 2e4adb2..8e6fa69 100644
--- a/src/soc/intel/skylake/chip.h
+++ b/src/soc/intel/skylake/chip.h
@@ -333,6 +333,14 @@ struct soc_intel_skylake_config {
     * Values: 0x0 - 4s, 0x1 - 6s, 0x2 - 8s, 0x3 - 10s, 0x4 - 12s, 0x5 - 14s
     */
    u8 PmConfigPwrBtnOverridePeriod;
+
+	/*
+	 * PCH Pm Slp S0 Voltage Margining Enable
+	 * Indicates platform has support for VCCPrim_Core Voltage Margining
+	 * in SLP_S0# asserted state.
+	 */
+	u8 PchPmSlpS0VmEnable;
+
    /*
     * Reset Power Cycle Duration could be customized in the unit of second.
     * PCH HW default is 4 seconds, and range is 1~4 seconds.
diff --git a/src/soc/intel/skylake/chip_fsp20.c b/src/soc/intel/skylake/chip_fsp20.c
index 8b8c37c..3d2f2cb 100644
--- a/src/soc/intel/skylake/chip_fsp20.c
+++ b/src/soc/intel/skylake/chip_fsp20.c
@@ -220,6 +220,11 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
    params->PchPmPwrBtnOverridePeriod =
    			config->PmConfigPwrBtnOverridePeriod;
    params->PchPmPwrCycDur = config->PmConfigPwrCycDur;
+
+	/* Disable Voltage margining if S0ix is enabled */
+	if (config->s0ix_enable)
+		params->PchPmSlpS0VmEnable = 0x0;
+
    params->PchSirqEnable = config->SerialIrqConfigSirqEnable;
    params->PchSirqMode = config->SerialIrqConfigSirqMode;