[S] Change in coreboot[master]: soc/intel/meteorlake: Add support to configure package c-state demotion

[Martin L Roth (Code Review)]

Martin L Roth has submitted this change. ( https://review.coreboot.org/c/coreboot/+/71654 )

Change subject: soc/intel/meteorlake: Add support to configure package c-state demotion
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soc/intel/meteorlake: 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.

Port of commit 4be8d9e80deb ("soc/intel/adl: Add support to configure
package c-state demotion")

BUG=none
TEST=Boot to the OS on Google/Rex.

Snippet from FSP log:
[SPEW ]   PkgCState Demotion : 0x1

Signed-off-by: Kapil Porwal 
Change-Id: I0a4b0b181349ce41035524482add4336cf83a68b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71654
Tested-by: build bot (Jenkins) 
Reviewed-by: Subrata Banik 
---
M src/soc/intel/meteorlake/chip.h
M src/soc/intel/meteorlake/fsp_params.c
2 files changed, 33 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Subrata Banik: Looks good to me, approved

diff --git a/src/soc/intel/meteorlake/chip.h b/src/soc/intel/meteorlake/chip.h
index ad382e3..dfd5c36 100644
--- a/src/soc/intel/meteorlake/chip.h
+++ b/src/soc/intel/meteorlake/chip.h
@@ -347,6 +347,13 @@
    uint8_t lan_clk;

/*
+	 * 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;
+
+	/*
     * Enable or Disable Skipping MBP HOB.
     * Default is set to 0 and set to 1 to skip the MBP HOB.
     */
diff --git a/src/soc/intel/meteorlake/fsp_params.c b/src/soc/intel/meteorlake/fsp_params.c
index acf376b..e850eaa 100644
--- a/src/soc/intel/meteorlake/fsp_params.c
+++ b/src/soc/intel/meteorlake/fsp_params.c
@@ -642,6 +642,7 @@
    /* Enable the energy efficient turbo mode */
    s_cfg->EnergyEfficientTurbo = 1;
    s_cfg->PmcLpmS0ixSubStateEnableMask = get_supported_lpm_mask();
+	s_cfg->PkgCStateDemotion = !config->disable_package_c_state_demotion;
 }