mb/intel/adlrvp: create dynamic power limits mechanism for thermal

Add dynamic power limits selection mechanism for aldrvp board.

BUG=None
BRANCH=None
TEST=Build FW and test on adlrvp with DPTF tool
 On adlrvp (282):
  Overriding DPTF power limits PL1 (3000, 15000) PL2 (55000, 55000)
 On adlrvp (682):
  Overriding DPTF power limits PL1 (5000, 45000) PL2 (115000, 115000)

Change-Id: Id1aef0125c6e1e105665172f19bda271e232d94f
Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56880
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/intel/adlrvp/Makefile.inc

@@ -24,6 +24,7 @@ ramstage-y += ec.c
 ramstage-y += mainboard.c
 ramstage-y += board_id.c
 ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
+ramstage-y += ramstage.c
 
 CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
 

src/mainboard/intel/adlrvp/include/baseboard/variants.h

@@ -35,4 +35,17 @@ void variant_configure_early_gpio_pads(void);
 
 size_t variant_memory_sku(void);
 const struct mb_cfg *variant_memory_params(void);
+
+/* Modify devictree settings during ramstage */
+void variant_devtree_update(void);
+struct cpu_power_limits {
+	uint16_t mchid;
+	unsigned int pl1_min_power;
+	unsigned int pl1_max_power;
+	unsigned int pl2_min_power;
+	unsigned int pl2_max_power;
+};
+/* Modify Power Limit devictree settings during ramstage */
+void variant_update_power_limits(void);
+
 #endif /*__BASEBOARD_VARIANTS_H__ */

src/mainboard/intel/adlrvp/mainboard.c

@@ -28,6 +28,13 @@ static void mainboard_init(void *chip_info)
 
 	if (CONFIG(EC_GOOGLE_CHROMEEC))
 		mainboard_ec_init();
+
+	variant_devtree_update();
+}
+
+void __weak variant_devtree_update(void)
+{
+	/* Override dev tree settings per board */
 }
 
 #if CONFIG(BOARD_INTEL_ADLRVP_M_EXT_EC)

src/mainboard/intel/adlrvp/ramstage.c

@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi_device.h>
+#include <baseboard/variants.h>
+#include <console/console.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <soc/pci_devs.h>
+
+#include <drivers/intel/dptf/chip.h>
+
+const struct cpu_power_limits limits[] = {
+	/* SKU_ID, pl1_min, pl1_max, pl2_min, pl2_max */
+	/* PL2 values are for performance configuration */
+	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_7, 3000, 15000,  55000,  55000 },
+	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_5, 4000, 28000,  64000,  64000 },
+	{ PCI_DEVICE_ID_INTEL_ADL_P_ID_3, 5000, 45000, 115000, 115000 },
+};
+
+void variant_update_power_limits(void)
+{
+	const struct device_path policy_path[] = {
+		{ .type = DEVICE_PATH_PCI, .pci.devfn = SA_DEVFN_DPTF},
+		{ .type = DEVICE_PATH_GENERIC, .generic.id = 0}
+	};
+
+	const struct device *policy_dev = find_dev_nested_path(pci_root_bus(),
+							policy_path, ARRAY_SIZE(policy_path));
+	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);
+
+	for (size_t i = 0; i < ARRAY_SIZE(limits); i++) {
+		if (mchid == limits[i].mchid) {
+			struct dptf_power_limits *settings = &config->controls.power_limits;
+			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;
+			printk(BIOS_INFO, "sumeet: Overriding DPTF power limits PL1 (%u, %u) PL2 (%u, %u)\n",
+					limits[i].pl1_min_power,
+					limits[i].pl1_max_power,
+					limits[i].pl2_min_power,
+					limits[i].pl2_max_power);
+		}
+	}
+}
+
+void variant_devtree_update(void)
+{
+	variant_update_power_limits();
+}