Change in coreboot[master]: soc/intel/jasperlake: Disable C1 C-state auto demotion

[Ben Kao (Code Review)]

Ben Kao has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/60254 )

Change subject: soc/intel/jasperlake: Disable C1 C-state auto demotion
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soc/intel/jasperlake: Disable C1 C-state auto demotion

Disable C1 C-state auto demotion to deduce SOC package power.

When enabled, CPU will conditionally demote C3/C6/C7 requests to C1
based on uncore auto-demote information.

TEST=test_that --board=dedede [IP] power_VideoCall

VideoCall       Enable C1 auto demotion    Disable C1 auto demotion
package-0_pwr_avg                  3.92                        3.15

Signed-off-by: Ben Kao 
Change-Id: I82565c734b28c60a1eee18ac079f5deaa6939d1e
---
M src/soc/intel/jasperlake/fsp_params.c
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/54/60254/1

diff --git a/src/soc/intel/jasperlake/fsp_params.c b/src/soc/intel/jasperlake/fsp_params.c
index 085148f7..c8545dd 100644
--- a/src/soc/intel/jasperlake/fsp_params.c
+++ b/src/soc/intel/jasperlake/fsp_params.c
@@ -209,6 +209,9 @@
    	params->PchFivrExtVnnRailEnabledStates = 0;
    }

+	/* Disable C1 C-state Demotion */
+	params->C1StateAutoDemotion = 0;
+
    /* Override/Fill FSP Silicon Param for mainboard */
    mainboard_silicon_init_params(params);
 }