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.fi...@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;
}
--
2.25.1
