mb/google/brya/var/kinox: Support DPTF oem_variables

Enable DPTF oem_variables and override based on charger type.

BUG=b:230803675
TEST=1. With 90W adapter, check ACPI object ODVX and oem_variable[0]=1
Name (ODVX, Package (0x06)
{
   0x00000001,
   0x00000000,
   0x00000000,
   0x00000000,
   0x00000000,
   0x00000000
})
2. With 65W adapter, check ACPI object ODVX and oem_variable[0]=0
Name (ODVX, Package (0x06)
{
   0x00000000,
   0x00000000,
   0x00000000,
   0x00000000,
   0x00000000,
   0x00000000
})

Signed-off-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Change-Id: I78929ecbc9db56aa234b3f46c641d1f2f3b7cba8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65251
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>

src/mainboard/google/brya/variants/kinox/overridetree.cb

@@ -177,6 +177,10 @@ chip soc/intel/alderlake
 						}
 				}"
 
+				register "oem_data.oem_variables" = "{
+						[0] = 0x0
+				}"
+
 				## Charger Performance Control (Control, mA)
 				register "controls.charger_perf" = "{
 					[0] = { 255, 1700 },

src/mainboard/google/brya/variants/kinox/ramstage.c

@@ -6,9 +6,12 @@
 #include <device/device.h>
 #include <device/pci_ids.h>
 #include <device/pci_ops.h>
+#include <drivers/intel/dptf/chip.h>
 #include <ec/google/chromeec/ec.h>
 #include <intelblocks/power_limit.h>
 
+WEAK_DEV_PTR(dptf_policy);
+
 const struct cpu_power_limits baseline_limits[] = {
 	/* SKU_ID, TDP (Watts), pl1_min, pl1_max, pl2_min, pl2_max, pl4 */
 	{ PCI_DID_INTEL_ADL_P_ID_10, 15, 12000, 25000,  39000,  39000, 72500 },
@@ -79,6 +82,20 @@ const struct psys_config psys_config = {
 	.bj_volts_mv = 20000
 };
 
+static void update_oem_variables_perf(void)
+{
+	const struct device *policy_dev;
+	struct drivers_intel_dptf_config *config;
+
+	policy_dev = DEV_PTR(dptf_policy);
+	if (!policy_dev)
+		return;
+
+	config = policy_dev->chip_info;
+	config->oem_data.oem_variables[0] = 1;
+	printk(BIOS_INFO, "PL124: Update oem_variables to Performance value.\n");
+}
+
 static const struct cpu_power_limits *get_power_limit(size_t *total_entries)
 {
 	enum usb_chg_type type;
@@ -94,6 +111,7 @@ static const struct cpu_power_limits *get_power_limit(size_t *total_entries)
 	if (type == USB_CHG_TYPE_PROPRIETARY) {
 		if (watts == CHARGER_170W) {
 			printk(BIOS_INFO, "PL124: Performance.\n");
+			update_oem_variables_perf();
 			*total_entries = ARRAY_SIZE(perf_limits);
 			return perf_limits;
 		} else {
@@ -104,6 +122,7 @@ static const struct cpu_power_limits *get_power_limit(size_t *total_entries)
 	} else {
 		if (watts >= CHARGER_90W) {
 			printk(BIOS_INFO, "PL124: Performance.\n");
+			update_oem_variables_perf();
 			*total_entries = ARRAY_SIZE(perf_limits);
 			return perf_limits;
 		} else {