mediatek: mt7623: fix thermal zone

Raising the temperatures for passive and active trips. @VA1DER
proposed at issue 9396 to remove passive trip. This commit relates to
his suggestion.

Without this patch. the CPU will be throttled all the way down to 98MHz
if the temperature rises even a degree above the trip point, and it was
further discovered that if the internal temperature of the device is
above the first trip point temperature when it boots then it will start
in a throttled state and even
$ echo disabled > /sys/class/thermal/thermal_zone0/mode
will have no effect.

The patch increases the passive trip point and active cooling map. The
throttling temperature will then be at 77°C and 82°C, which is still a
low enough temperature for ARM devices to not be in the real danger
zone, and gives some operational headroom.

Signed-off-by: Bruno Umuarama <anonimou_eu@hotmail.com>

diff --git a/target/linux/mediatek/patches-5.15/193-dts-mt7623-thermal_zone_fix.patch b/target/linux/mediatek/patches-5.15/193-dts-mt7623-thermal_zone_fix.patch
new file mode 100644 (file)
index 0000000..1cfb53d
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/193-dts-mt7623-thermal_zone_fix.patch
@@ -0,0 +1,48 @@
+From 824d56e753a588fcfd650db1822e34a02a48bb77 Mon Sep 17 00:00:00 2001
+From: Bruno Umuarama <anonimou_eu@hotmail.com>
+Date: Thu, 13 Oct 2022 21:18:21 +0000
+Subject: [PATCH] mediatek: mt7623: fix thermal zone
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Raising the temperatures for passive and active trips. @VA1DER
+proposed at issue 9396 to remove passive trip. This commit relates to
+his suggestion.
+
+Without this patch. the CPU will be throttled all the way down to 98MHz
+if the temperature rises even a degree above the trip point, and it was
+further discovered that if the internal temperature of the device is
+above the first trip point temperature when it boots then it will start
+in a throttled state and even
+$ echo disabled > /sys/class/thermal/thermal_zone0/mode
+will have no effect.
+
+The patch increases the passive trip point and active cooling map. The
+throttling temperature will then be at 77°C and 82°C, which is still a
+low enough temperature for ARM devices to not be in the real danger
+zone, and gives some operational headroom.
+
+Signed-off-by: Bruno Umuarama <anonimou_eu@hotmail.com>
+---
+ arch/arm/boot/dts/mt7623.dtsi | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/arch/arm/boot/dts/mt7623.dtsi
++++ b/arch/arm/boot/dts/mt7623.dtsi
+@@ -160,13 +160,13 @@
+ 
+                               trips {
+                                       cpu_passive: cpu-passive {
+-                                              temperature = <57000>;
++                                              temperature = <77000>;
+                                               hysteresis = <2000>;
+                                               type = "passive";
+                                       };
+ 
+                                       cpu_active: cpu-active {
+-                                              temperature = <67000>;
++                                              temperature = <82000>;
+                                               hysteresis = <2000>;
+                                               type = "active";
+                                       };