soc/intel/tigerlake: Add devicetree support to change PCH VR settings

For Tiger Lake platforms, this patch set provides a way to override PCH
external VR settings and ext rail voltage/current through devicetree.
This enables setting of optimal settings for FIVRs for a particular PCH
type.

BUG=None
BRANCH=None
TEST=Build and boot volteer.

Signed-off-by: Venkata Krishna Nimmagadda <venkata.krishna.nimmagadda@intel.com>
Change-Id: Ic55472d392f27d153656afbe8692be7e243bb374
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41424
Reviewed-by: Venkata Krishna Nimmagadda <Venkata.krishna.nimmagadda@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/soc/intel/tigerlake/fsp_params.c b/src/soc/intel/tigerlake/fsp_params.c
index 926d8eb7b4..b9dbec87f5 100644
--- a/src/soc/intel/tigerlake/fsp_params.c
+++ b/src/soc/intel/tigerlake/fsp_params.c
@@ -262,6 +262,29 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 			params->ITbtPcieRootPortEn[i] = 0;
 	}
 
+	/* PCH FIVR settings override */
+	if (config->ext_fivr_settings.configure_ext_fivr) {
+		params->PchFivrExtV1p05RailEnabledStates =
+			config->ext_fivr_settings.v1p05_enable_bitmap;
+
+		params->PchFivrExtV1p05RailSupportedVoltageStates =
+			config->ext_fivr_settings.v1p05_supported_voltage_bitmap;
+
+		params->PchFivrExtVnnRailEnabledStates =
+			config->ext_fivr_settings.vnn_enable_bitmap;
+
+		params->PchFivrExtVnnRailSupportedVoltageStates =
+			config->ext_fivr_settings.vnn_supported_voltage_bitmap;
+
+		/* convert mV to number of 2.5 mV increments */
+		params->PchFivrExtVnnRailSxVoltage =
+			(config->ext_fivr_settings.vnn_sx_voltage_mv * 10) / 25;
+
+		params->PchFivrExtV1p05RailIccMaximum =
+			config->ext_fivr_settings.v1p05_icc_max_ma;
+
+	}
+
 	mainboard_silicon_init_params(params);
 }