mb/google/brya/variants/hades: Add CPU power limits

Add CPU power limits support and values for RPL on Hades

BUG=b:269371363
TEST=builds


Change-Id: I22ef56152abe5a23067c5e923b07d60dc9fac8e7
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73895
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/baseboard/hades/Makefile.inc

@@ -1 +1,2 @@
 romstage-y += memory.c
+ramstage-y += ramstage.c

src/mainboard/google/brya/variants/baseboard/hades/ramstage.c

@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi_device.h>
+#include <baseboard/variants.h>
+#include <console/console.h>
+#include <device/pci_ops.h>
+#include <soc/pci_devs.h>
+
+#include <drivers/intel/dptf/chip.h>
+#include <intelblocks/power_limit.h>
+
+WEAK_DEV_PTR(dptf_policy);
+
+void variant_update_power_limits(const struct cpu_power_limits *limits, size_t num_entries)
+{
+	if (!num_entries)
+		return;
+
+	const struct device *policy_dev = DEV_PTR(dptf_policy);
+	if (!policy_dev)
+		return;
+
+	struct drivers_intel_dptf_config *config = policy_dev->chip_info;
+
+	uint16_t mchid = pci_s_read_config16(PCI_DEV(0, 0, 0), PCI_DEVICE_ID);
+
+	u8 tdp = get_cpu_tdp();
+
+	for (size_t i = 0; i < num_entries; i++) {
+		if (mchid == limits[i].mchid && tdp == limits[i].cpu_tdp) {
+			struct dptf_power_limits *settings = &config->controls.power_limits;
+			config_t *conf = config_of_soc();
+			struct soc_power_limits_config *soc_config = conf->power_limits_config;
+			settings->pl1.min_power = limits[i].pl1_min_power;
+			settings->pl1.max_power = limits[i].pl1_max_power;
+			settings->pl2.min_power = limits[i].pl2_min_power;
+			settings->pl2.max_power = limits[i].pl2_max_power;
+			soc_config->tdp_pl4 = DIV_ROUND_UP(limits[i].pl4_power,
+				MILLIWATTS_TO_WATTS);
+			printk(BIOS_INFO, "Overriding power limits PL1 (%u, %u) PL2 (%u, %u) PL4 (%u)\n",
+				limits[i].pl1_min_power,
+				limits[i].pl1_max_power,
+				limits[i].pl2_min_power,
+				limits[i].pl2_max_power,
+				limits[i].pl4_power);
+		}
+	}
+}

src/mainboard/google/brya/variants/hades/Makefile.inc

@@ -1,3 +1,4 @@
 bootblock-y += gpio.c
 romstage-y += gpio.c
 ramstage-y += gpio.c
+ramstage-y += ramstage.c

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

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <device/pci_ids.h>
+
+const struct cpu_power_limits limits[] = {
+	/* SKU_ID, TDP (Watts), pl1_min, pl1_max, pl2_min, pl2_max, pl4 */
+	/* Following values are for performance config as per document #686872 */
+	{ PCI_DID_INTEL_RPL_P_ID_1, 45, 18000, 45000, 115000, 115000, 210000 },
+	{ PCI_DID_INTEL_RPL_P_ID_2, 28, 10000, 28000,  64000,  64000, 126000 },
+	{ PCI_DID_INTEL_RPL_P_ID_3, 15,  6000, 15000,  55000,  55000, 114000 },
+};
+
+void variant_devtree_update(void)
+{
+	size_t total_entries = ARRAY_SIZE(limits);
+	variant_update_power_limits(limits, total_entries);
+}