[coreboot-gerrit] [S] Change in coreboot[master]: soc/intel/meteorlake: Add EPP override support

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74154 )

Change subject: soc/intel/meteorlake: Add EPP override support
......................................................................

soc/intel/meteorlake: Add EPP override support

This updates energy performance preference value to all logical CPUs
when the corresponding chip config is true.

This patch is backported from
commit hash 0bb2225718ef898c (soc/intel/alderlake: Add EPP override
support).

BUG=b:266522659
TEST=Able to build and boot google/rex.

Signed-off-by: Subrata Banik 
Change-Id: I8172276159fe3987dae36ec30ebceb76dd0ef326
---
M src/soc/intel/meteorlake/chip.h
M src/soc/intel/meteorlake/cpu.c
2 files changed, 44 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/54/74154/1

diff --git a/src/soc/intel/meteorlake/chip.h b/src/soc/intel/meteorlake/chip.h
index 9bafb22..9d9a600 100644
--- a/src/soc/intel/meteorlake/chip.h
+++ b/src/soc/intel/meteorlake/chip.h
@@ -346,6 +346,10 @@

/* Enable PCH to CPU energy report feature. */
    bool pch_pm_energy_report_enable;
+
+	/* Energy-Performance Preference (HWP feature) */
+	bool enable_energy_perf_pref;
+	uint8_t energy_perf_pref_value;
 };

typedef struct soc_intel_meteorlake_config config_t;
diff --git a/src/soc/intel/meteorlake/cpu.c b/src/soc/intel/meteorlake/cpu.c
index 31b7ef2..62639a1 100644
--- a/src/soc/intel/meteorlake/cpu.c
+++ b/src/soc/intel/meteorlake/cpu.c
@@ -124,6 +124,12 @@
    /* Set energy policy */
    set_energy_perf_bias(ENERGY_POLICY_NORMAL);

+	const config_t *conf = config_of_soc();
+	/* Set energy-performance preference */
+	if (conf->enable_energy_perf_pref)
+		if (check_energy_perf_cap())
+			set_energy_perf_pref(conf->energy_perf_pref_value);
+
    /* Enable Turbo */
    enable_turbo();

@@ -140,6 +146,19 @@
    smm_relocate();
 }

+static void pre_mp_init(void)
+{
+	soc_fsp_load();
+
+	const config_t *conf = config_of_soc();
+	if (conf->enable_energy_perf_pref) {
+		if (check_energy_perf_cap())
+			enable_energy_perf_pref();
+		else
+			printk(BIOS_WARNING, "Energy Performance Preference not supported!\n");
+	}
+}
+
 static void post_mp_init(void)
 {
    /* Set Max Ratio */
@@ -160,7 +179,7 @@
     * that are set prior to ramstage.
     * Real MTRRs programming are being done after resource allocation.
     */
-	.pre_mp_init = soc_fsp_load,
+	.pre_mp_init = pre_mp_init,
    .get_cpu_count = get_cpu_count,
    .get_smm_info = smm_info,
    .get_microcode_info = get_microcode_info,