Read i.MX9 CPU temp grade from fuses and fixup thermal trips in Linux device-tree accordingly.
Based on commit 0543a1ed2787 ("imx8m: fixup thermal trips")
Signed-off-by: Primoz Fiser primoz.fiser@norik.com --- arch/arm/mach-imx/imx9/soc.c | 45 ++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)
diff --git a/arch/arm/mach-imx/imx9/soc.c b/arch/arm/mach-imx/imx9/soc.c index 86b45be3d804..f06339f13880 100644 --- a/arch/arm/mach-imx/imx9/soc.c +++ b/arch/arm/mach-imx/imx9/soc.c @@ -507,8 +507,53 @@ int print_cpuinfo(void) return 0; }
+static int fixup_thermal_trips(void *blob, const char *name) +{ + int minc, maxc; + int node, trip; + + node = fdt_path_offset(blob, "/thermal-zones"); + if (node < 0) + return node; + + node = fdt_subnode_offset(blob, node, name); + if (node < 0) + return node; + + node = fdt_subnode_offset(blob, node, "trips"); + if (node < 0) + return node; + + get_cpu_temp_grade(&minc, &maxc); + + fdt_for_each_subnode(trip, blob, node) { + const char *type; + int temp, ret; + + type = fdt_getprop(blob, trip, "type", NULL); + if (!type) + continue; + + temp = 0; + if (!strcmp(type, "critical")) + temp = 1000 * (maxc - 5); + else if (!strcmp(type, "passive")) + temp = 1000 * (maxc - 10); + if (temp) { + ret = fdt_setprop_u32(blob, trip, "temperature", temp); + if (ret) + return ret; + } + } + + return 0; +} + int ft_system_setup(void *blob, struct bd_info *bd) { + if (fixup_thermal_trips(blob, "cpu-thermal")) + printf("Failed to update cpu-thermal trip(s)"); + return 0; }