Change in coreboot[master]: mb/siemens/mc_ehl: Disable all P-States

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/58894 )

Change subject: mb/siemens/mc_ehl: Disable all P-States
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mb/siemens/mc_ehl: Disable all P-States

In order to get a reliable real-time performance disable all P-States
for all mc_ehl based mainboard.

Change-Id: I22857cc0f1476483ca82c1c872e4519e4b350ea9
Signed-off-by: Werner Zeh 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58894
Tested-by: build bot (Jenkins) 
Reviewed-by: Lean Sheng Tan 
Reviewed-by: Mario Scheithauer 
---
M src/mainboard/siemens/mc_ehl/mainboard.c
1 file changed, 3 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Mario Scheithauer: Looks good to me, approved
  Lean Sheng Tan: Looks good to me, approved

diff --git a/src/mainboard/siemens/mc_ehl/mainboard.c b/src/mainboard/siemens/mc_ehl/mainboard.c
index eff2d21..fc03115 100644
--- a/src/mainboard/siemens/mc_ehl/mainboard.c
+++ b/src/mainboard/siemens/mc_ehl/mainboard.c
@@ -122,6 +122,9 @@

/* Set maximum package C-state to PkgC0C1 */
    params->PkgCStateLimit = 0;
+
+	/* Disable P-States */
+	params->MaxRatio = 0;
 }

static void mainboard_init(void *chip_info)