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arm: mach-k3: am62: fixup thermal cooling device cpus

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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>
This commit is contained in:
Parth Pancholi
2024-10-02 09:41:33 +02:00
committed by Tom Rini
parent 22371048ed
commit c01d6934a7
1 changed files with 36 additions and 0 deletions
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36
arch/arm/mach-k3/am62x/am625_fdt.c
View File

@@ -5,6 +5,7 @@
#include <asm/hardware.h>
#include <fdt_support.h>
#include <fdtdec.h>
#include "../common_fdt.h"
@@ -75,12 +76,47 @@ static void fdt_fixup_thermal_zone_nodes_am625(void *blob, int maxc)
}
}
static void fdt_fixup_thermal_cooling_device_cpus_am625(void *blob, int core_nr)
{
static const char * const thermal_path[] = {
"/thermal-zones/main0-thermal/cooling-maps/map0",
"/thermal-zones/main1-thermal/cooling-maps/map0"
};
int node, cnt, i, ret;
u32 cooling_dev[12];
for (i = 0; i < ARRAY_SIZE(thermal_path); i++) {
int new_count = core_nr * 3; /* Each CPU has 3 entries */
int j;
node = fdt_path_offset(blob, thermal_path[i]);
if (node < 0)
continue; /* Not found, skip it */
cnt = fdtdec_get_int_array_count(blob, node, "cooling-device",
cooling_dev, ARRAY_SIZE(cooling_dev));
if (cnt < 0)
continue;
for (j = 0; j < new_count; j++)
cooling_dev[j] = cpu_to_fdt32(cooling_dev[j]);
ret = fdt_setprop(blob, node, "cooling-device", cooling_dev,
new_count * sizeof(u32));
if (ret < 0)
printf("Error %s, cooling-device setprop failed %d\n",
thermal_path[i], ret);
}
}
int ft_system_setup(void *blob, struct bd_info *bd)
{
fdt_fixup_cores_nodes_am625(blob, k3_get_core_nr());
fdt_fixup_gpu_nodes_am625(blob, k3_has_gpu());
fdt_fixup_pru_node_am625(blob, k3_has_pru());
fdt_fixup_thermal_zone_nodes_am625(blob, k3_get_max_temp());
fdt_fixup_thermal_cooling_device_cpus_am625(blob, k3_get_core_nr());
fdt_fixup_reserved(blob, "tfa", CONFIG_K3_ATF_LOAD_ADDR, 0x80000);
fdt_fixup_reserved(blob, "optee", CONFIG_K3_OPTEE_LOAD_ADDR, 0x1800000);