Change in coreboot[master]: mainboard/google/poppy/variants/rammus: Modify VR setting

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change and it was merged. ( https://review.coreboot.org/28695 )

Change subject: mainboard/google/poppy/variants/rammus: Modify VR setting
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mainboard/google/poppy/variants/rammus: Modify VR setting

We refer to Intel Doc#594883.
The recommended Ac/Dc loadline values are as below:
# VR Settings Configuration for 4 Domains
#+----------------+-------+-------+-------+-------+
#| Domain/Setting |  SA   |  IA   | GTUS  |  GTS  |
#+----------------+-------+-------+-------+-------+
#| Psi1Threshold  | 20A   | 20A   | 20A   | 20A   |
#| Psi2Threshold  | 2A    | 2A    | 2A    | 2A    |
#| Psi3Threshold  | 1A    | 1A    | 1A    | 1A    |
#| Psi3Enable     | 1     | 1     | 1     | 1     |
#| Psi4Enable     | 1     | 1     | 1     | 1     |
#| ImonSlope      | 0     | 0     | 0     | 0     |
#| ImonOffset     | 0     | 0     | 0     | 0     |
#| VrVoltageLimit | 1.52V | 1.52V | 1.52V | 1.52V |
#| AcLoadline     | 14.4  | 4.2   | 5.7   | 4.47  |
#| DcLoadline     | 14.0  | 4.17  | 4.2   | 4.3   |
#+----------------+-------+-------+-------+-------+

BUG=b:112167318
BRANCH=master
TEST=emerge-rammus coreboot chromeos-ec chromeos-bootimage
Flash FW to DUT, and make sure system boots up.

Change-Id: I2d83d835ec841ac4cc811a0a69f74d203d5ea173
Signed-off-by: statham_chu 
Reviewed-on: https://review.coreboot.org/28695
Tested-by: build bot (Jenkins) 
Reviewed-by: Furquan Shaikh 
---
M src/mainboard/google/poppy/variants/rammus/devicetree.cb
1 file changed, 9 insertions(+), 9 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Furquan Shaikh: Looks good to me, approved

diff --git a/src/mainboard/google/poppy/variants/rammus/devicetree.cb b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
index 7b851ac..b750cb8 100644
--- a/src/mainboard/google/poppy/variants/rammus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
@@ -83,8 +83,8 @@
    #| ImonSlope      | 0     | 0     | 0     | 0     |
    #| ImonOffset     | 0     | 0     | 0     | 0     |
    #| VrVoltageLimit | 1.52V | 1.52V | 1.52V | 1.52V |
-	#| AcLoadline     | 15    | 5.7   | 5.5   | 5.5   |
-	#| DcLoadline     | 14.3  | 4.83  | 4.2   | 4.2   |
+	#| AcLoadline     | 14.4  | 4.2   | 5.7   | 4.47  |
+	#| DcLoadline     | 14.0  | 4.17  | 4.2   | 4.3   |
    #+----------------+-------+-------+-------+-------+
    register "domain_vr_config[VR_SYSTEM_AGENT]" = "{
    	.vr_config_enable = 1,
@@ -96,8 +96,8 @@
    	.imon_slope = 0x0,
    	.imon_offset = 0x0,
    	.voltage_limit = 1520,
-		.ac_loadline = 1500,
-		.dc_loadline = 1430,
+		.ac_loadline = 1440,
+		.dc_loadline = 1400,
    }"

register "domain_vr_config[VR_IA_CORE]" = "{
@@ -110,8 +110,8 @@
    	.imon_slope = 0x0,
    	.imon_offset = 0x0,
    	.voltage_limit = 1520,
-		.ac_loadline = 570,
-		.dc_loadline = 483,
+		.ac_loadline = 420,
+		.dc_loadline = 417,
    }"

register "domain_vr_config[VR_GT_UNSLICED]" = "{
@@ -124,7 +124,7 @@
    	.imon_slope = 0x0,
    	.imon_offset = 0x0,
    	.voltage_limit = 1520,
-		.ac_loadline = 550,
+		.ac_loadline = 570,
    	.dc_loadline = 420,
    }"

@@ -138,8 +138,8 @@
    	.imon_slope = 0x0,
    	.imon_offset = 0x0,
    	.voltage_limit = 1520,
-		.ac_loadline = 550,
-		.dc_loadline = 420,
+		.ac_loadline = 447,
+		.dc_loadline = 430,
    }"

# Enable Root port 1.