Change in coreboot[master]: soc/intel/alderlake: Allow mainboard to configure c1-state auto-demotion

[Nick Vaccaro (Code Review)]

Nick Vaccaro has submitted this change. ( https://review.coreboot.org/c/coreboot/+/62629 )

Change subject: soc/intel/alderlake: Allow mainboard to configure c1-state auto-demotion
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soc/intel/alderlake: Allow mainboard to configure c1-state auto-demotion

FSP has a parameter to enable/disable c1-state autodemotion feature.
Boards/Baseboard can choose to use this feature as per requirement.

This patch hooks up this parameter to 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 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62629
Tested-by: build bot (Jenkins) 
Reviewed-by: Nick Vaccaro 
---
M src/soc/intel/alderlake/chip.h
M src/soc/intel/alderlake/fsp_params.c
2 files changed, 8 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Nick Vaccaro: Looks good to me, approved

diff --git a/src/soc/intel/alderlake/chip.h b/src/soc/intel/alderlake/chip.h
index e7e2f20..a69e645 100644
--- a/src/soc/intel/alderlake/chip.h
+++ b/src/soc/intel/alderlake/chip.h
@@ -560,6 +560,12 @@
    /* Energy-Performance Preference (HWP feature) */
    bool enable_energy_perf_pref;
    uint8_t energy_perf_pref_value;
+
+	/*
+	 * Enable or Disable C1 Cstate Demotion.
+	 * Default 0. Set this to 1 in order to disable C state demotion.
+	 */
+	bool disable_c1_state_auto_demotion;
 };

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 90ecf86..f0e0ac2 100644
--- a/src/soc/intel/alderlake/fsp_params.c
+++ b/src/soc/intel/alderlake/fsp_params.c
@@ -717,6 +717,8 @@
    	/* PsysPmax is in unit of 1/8 Watt */
    	s_cfg->PsysPmax = config->platform_pmax * 8;
    }
+
+	s_cfg->C1StateAutoDemotion = !config->disable_c1_state_auto_demotion;
 }

static void fill_fsps_irq_params(FSP_S_CONFIG *s_cfg,