Change in coreboot[master]: soc/intel/alder lake: Allow mainboard to configure C state auto-demotion

[Maulik V Vaghela (Code Review)]

Maulik V Vaghela has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/62629 )

Change subject: soc/intel/alder lake: Allow mainboard to configure C state auto-demotion
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soc/intel/alder lake: Allow mainboard to configure C state auto-demotion

FSP has parameter to enable/disable C1 state autodemotion feature.
Boards/Baseboard can choose to use this feature as per requirement.

This patch enables mainboard to configure the feature from devicetree

BUG=b:221876248
BRANCH=firmware-brya-14505.B
TEST=Check code compiles and correct value has been passed to FSP.

Change-Id: I2d7839d8fecd7b5403f52f3926d1d0bc06728ed9
Signed-off-by: MAULIK V VAGHELA 
---
M src/soc/intel/alderlake/chip.h
M src/soc/intel/alderlake/fsp_params.c
2 files changed, 9 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/29/62629/1

diff --git a/src/soc/intel/alderlake/chip.h b/src/soc/intel/alderlake/chip.h
index aad45df..dc10b31 100644
--- a/src/soc/intel/alderlake/chip.h
+++ b/src/soc/intel/alderlake/chip.h
@@ -564,6 +564,12 @@
     * Default 0. Setting this to 1 enable CNVi DDR RFIM.
     */
    bool CnviDdrRfim;
+
+	/*
+	 * Enable or Disable C1 Cstate Demotion.
+	 * Default 0. Set this to 1 in order to disable C state demotion.
+	 */
+	bool DisableC1StateAutoDemotion;
 };

typedef struct soc_intel_alderlake_config config_t;
diff --git a/src/soc/intel/alderlake/fsp_params.c b/src/soc/intel/alderlake/fsp_params.c
index dac3693..3e5af3f 100644
--- a/src/soc/intel/alderlake/fsp_params.c
+++ b/src/soc/intel/alderlake/fsp_params.c
@@ -717,6 +717,9 @@
    	/* PsysPmax is in unit of 1/8 Watt */
    	s_cfg->PsysPmax = config->PsysPmax * 8;
    }
+
+	/* Program C state auto-demotion */
+	s_cfg->C1StateAutoDemotion = !config->DisableC1StateAutoDemotion;
 }

static void fill_fsps_irq_params(FSP_S_CONFIG *s_cfg,