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c01d6934a7
AM62x devices now support CPU throttling based on thermal alerts
with a Linux commit 10e7bfd8114c ("arm64: dts: ti: k3-am62: Enable
CPU freq throttling on thermal alert"). However, this functionality
does not work correctly across all variants of the AM62x SoCs
which have different numbers of Cortex-A CPU cores: AM62x1 (1 core),
AM62x2 (2 cores), and AM62x4 (4 cores). On single-core and dual-core
AM62x devices, the following error is observed in the Linux kernel:
OF: /thermal-zones/main0-thermal/cooling-maps/map0: could not find
phandle 94
OF: /thermal-zones/main1-thermal/cooling-maps/map0: could not find
phandle 94
This commit adds a fixup to dynamically adjust the cooling-device
nodes in the thermal zones based on the actual number of CPU cores
available. This resolves the issue of CPU throttling not working
correctly on single-core and dual-core AM62x devices, while
maintaining the functionality for AM62x quad-core devices.
A similar approach is implemented for example on i.MX8MM SoC.
Signed-off-by: Parth Pancholi <parth.pancholi@toradex.com>
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2023 Toradex - https://www.toradex.com/
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*/
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#include <asm/hardware.h>
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#include <fdt_support.h>
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#include <fdtdec.h>
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#include "../common_fdt.h"
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static void fdt_fixup_cores_nodes_am625(void *blob, int core_nr)
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{
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char node_path[32];
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if (core_nr < 1)
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return;
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for (; core_nr < 4; core_nr++) {
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snprintf(node_path, sizeof(node_path), "/cpus/cpu@%d", core_nr);
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fdt_del_node_path(blob, node_path);
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snprintf(node_path, sizeof(node_path), "/cpus/cpu-map/cluster0/core%d", core_nr);
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fdt_del_node_path(blob, node_path);
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snprintf(node_path, sizeof(node_path), "/bus@f0000/watchdog@e0%d0000", core_nr);
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fdt_del_node_path(blob, node_path);
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}
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}
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static void fdt_fixup_gpu_nodes_am625(void *blob, int has_gpu)
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{
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if (!has_gpu) {
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fdt_del_node_path(blob, "/bus@f0000/gpu@fd00000");
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fdt_del_node_path(blob, "/bus@f0000/watchdog@e0f0000");
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}
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}
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static void fdt_fixup_pru_node_am625(void *blob, int has_pru)
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{
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if (!has_pru)
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fdt_del_node_path(blob, "/bus@f0000/pruss@30040000");
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}
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static int fdt_fixup_trips_node(void *blob, int zoneoffset, int maxc)
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{
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int node, trip;
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node = fdt_subnode_offset(blob, zoneoffset, "trips");
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if (node < 0)
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return -1;
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fdt_for_each_subnode(trip, blob, node) {
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const char *type = fdt_getprop(blob, trip, "type", NULL);
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if (!type || (strncmp(type, "critical", 8) != 0))
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continue;
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if (fdt_setprop_u32(blob, trip, "temperature", 1000 * maxc) < 0)
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return -1;
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}
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return 0;
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}
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static void fdt_fixup_thermal_zone_nodes_am625(void *blob, int maxc)
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{
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int node, zone;
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node = fdt_path_offset(blob, "/thermal-zones");
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if (node < 0)
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return;
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fdt_for_each_subnode(zone, blob, node) {
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if (fdt_fixup_trips_node(blob, zone, maxc) < 0)
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printf("Failed to set temperature in %s critical trips\n",
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fdt_get_name(blob, zone, NULL));
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}
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}
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static void fdt_fixup_thermal_cooling_device_cpus_am625(void *blob, int core_nr)
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{
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static const char * const thermal_path[] = {
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"/thermal-zones/main0-thermal/cooling-maps/map0",
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"/thermal-zones/main1-thermal/cooling-maps/map0"
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};
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int node, cnt, i, ret;
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u32 cooling_dev[12];
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for (i = 0; i < ARRAY_SIZE(thermal_path); i++) {
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int new_count = core_nr * 3; /* Each CPU has 3 entries */
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int j;
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node = fdt_path_offset(blob, thermal_path[i]);
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if (node < 0)
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continue; /* Not found, skip it */
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cnt = fdtdec_get_int_array_count(blob, node, "cooling-device",
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cooling_dev, ARRAY_SIZE(cooling_dev));
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if (cnt < 0)
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continue;
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for (j = 0; j < new_count; j++)
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cooling_dev[j] = cpu_to_fdt32(cooling_dev[j]);
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ret = fdt_setprop(blob, node, "cooling-device", cooling_dev,
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new_count * sizeof(u32));
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if (ret < 0)
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printf("Error %s, cooling-device setprop failed %d\n",
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thermal_path[i], ret);
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}
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}
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int ft_system_setup(void *blob, struct bd_info *bd)
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{
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fdt_fixup_cores_nodes_am625(blob, k3_get_core_nr());
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fdt_fixup_gpu_nodes_am625(blob, k3_has_gpu());
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fdt_fixup_pru_node_am625(blob, k3_has_pru());
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fdt_fixup_thermal_zone_nodes_am625(blob, k3_get_max_temp());
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fdt_fixup_thermal_cooling_device_cpus_am625(blob, k3_get_core_nr());
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fdt_fixup_reserved(blob, "tfa", CONFIG_K3_ATF_LOAD_ADDR, 0x80000);
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fdt_fixup_reserved(blob, "optee", CONFIG_K3_OPTEE_LOAD_ADDR, 0x1800000);
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return 0;
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}
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