soc/intel/adl: Add support to configure package c-state demotion

This patch adds the support to enable/disable package c-state demotion
feature from the devicetree based on mainboard requirement.

BUG=b:235005582
TEST=Build and boot to verify that the right value has been passed to
the FSP.

Signed-off-by: V Sowmya <v.sowmya@intel.com>
Change-Id: I9e254988bc3d20b9f9e42a605cc0ebd419ab49ad
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65663
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Reviewed-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/soc/intel/alderlake/chip.h

@@ -614,6 +614,13 @@ struct soc_intel_alderlake_config {
 	 * Workaround for Intel TA# 723158 to prevent possible display flicker.
 	 */
 	bool usb2_phy_sus_pg_disable;
+
+	/*
+	 * Enable or Disable Package C-state Demotion.
+	 * Default is set to 0.
+	 * Set this to 1 in order to disable Package C-state demotion.
+	 */
+	bool disable_package_c_state_demotion;
 };
 
 typedef struct soc_intel_alderlake_config config_t;

src/soc/intel/alderlake/fsp_params.c

@@ -965,6 +965,8 @@ static void fill_fsps_misc_power_params(FSP_S_CONFIG *s_cfg,
 	s_cfg->C1StateAutoDemotion = !config->disable_c1_state_auto_demotion;
 
 	s_cfg->VrPowerDeliveryDesign = config->vr_power_delivery_design;
+
+	s_cfg->PkgCStateDemotion = !config->disable_package_c_state_demotion;
 }
 
 static void fill_fsps_irq_params(FSP_S_CONFIG *s_cfg,