[coreboot-gerrit] Change in coreboot[master]: soc/skylake/vr_config: fix VR config for KBL-U CPUs

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/36058 )

Change subject: soc/skylake/vr_config: fix VR config for KBL-U CPUs
......................................................................

soc/skylake/vr_config: fix VR config for KBL-U CPUs

These changes are in accordance with the documentation:
[1] page 106, 7th Generation Intel(R) Processor Families for U/Y
    Platforms and 8th Generation Intel(R) Processor Family for U Quad
    Core and Y Dual Core Platforms. Datasheet, Volume 1. January 2019.
    Document Number: 334661-006

Change-Id: I5232a7a670b97d51ff3b3b71a08f25f961ac1d6f
Signed-off-by: Maxim Polyakov 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36058
Reviewed-by: Angel Pons 
Reviewed-by: Matt DeVillier 
Reviewed-by: Michael Niewöhner
Tested-by: build bot (Jenkins) 
---
M src/soc/intel/skylake/vr_config.c
1 file changed, 15 insertions(+), 6 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Matt DeVillier: Looks good to me, but someone else must approve
  Angel Pons: Looks good to me, approved
  Michael Niewöhner: Looks good to me, but someone else must approve

diff --git a/src/soc/intel/skylake/vr_config.c b/src/soc/intel/skylake/vr_config.c
index da2bfc8..54dfd31 100644
--- a/src/soc/intel/skylake/vr_config.c
+++ b/src/soc/intel/skylake/vr_config.c
@@ -121,15 +121,17 @@
     *   SKL-U + OPC          (15W) GT3 dual    5.1      29      57/19
     *   SKL-U                (15W) GT2 dual    4.5      29      31
     *
-	 *   KBL-U/R + OPC        (28W) GT3 dual    5.1      32      57/19
-	 *   KBL-U/R + OPC        (15W) GT3 dual    5.1      32      57/19
+	 *   KBL-U + OPC          (28W) GT3 dual    5.1      32      57/19
+	 *   KBL-U + OPC          (15W) GT3 dual    5.1      32      57/19
+	 *   KBL-U                (15W) GT1/2 dual  4.5      32      31
+	 *   KBL-U [*]            (15W) GT1 quad    4.5      29      31
     *
     *   KBL-U/R              (15W) GT2 quad    6        64      31
-	 *   KBL-U/R              (15W) GT1/2 dual  4.5      32      31
-	 *   KBL-U/R              (15W) GT2 quad    4.5      29      31
     *
     *   SKL/KBL-Y            (6W)              4.1      24      24
     *   SKL/KBL-Y            (4.5W)            4.1      24      24
+	 *
+	 *   [*] Pentium/Celeron CPUs with HD Graphics 610
     */

switch (mch_id) {
@@ -220,10 +222,17 @@
    case PCI_DEVICE_ID_INTEL_KBL_ID_U: {
    	uint16_t icc_max[NUM_VR_DOMAINS] = VR_CFG_ALL_DOMAINS_ICC(4.5, 32, 31, 31);

-		if ((igd_id == PCI_DEVICE_ID_INTEL_KBL_GT3E_SULTM_1) ||
-		    (igd_id == PCI_DEVICE_ID_INTEL_KBL_GT3E_SULTM_2))
+		if (igd_id == PCI_DEVICE_ID_INTEL_KBL_GT1_SULTM)
    		icc_max[VR_IA_CORE] = VR_CFG_AMP(29);

+		else if ((igd_id == PCI_DEVICE_ID_INTEL_KBL_GT3E_SULTM_1) ||
+		         (igd_id == PCI_DEVICE_ID_INTEL_KBL_GT3E_SULTM_2)) {
+			const uint16_t icc_max_gt3[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_ICC(5.1, 32, 57, 19);
+
+			return icc_max_gt3[domain];
+		}
+
    	return icc_max[domain];
    }
    default: