mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-10 18:53:38 +00:00
Code Issues Releases Wiki Activity

arm64: dts: marvell: Enable AP806 thermal throttling with CPUfreq

Browse source 
Avoid critical temperatures in the AP806 by adding the relevant trip
points/cooling-maps using CPUfreq as cooling device.

So far, when the temperature reaches 100°C in the thermal IP of the
AP806 (close enough from the 2/4 cores) an overheat interrupt is
raised. The thermal core then shutdowns the system to avoid damaging
the hardware.

Adding CPUfreq as a cooling device could help avoiding such very
critical situation. For that, we enable thermal throttling by
defining, for each CPU, two trip points with the corresponding cooling
'intensity'. CPU0 and CPU1 are in the same cluster and are driven by
the same clock. Same applies for CPU2 and CPU3, if available. So
changing the frequency of one will also change the frequency of the
other one, hence the use of two cooling devices per core.

The heat map is as follow:
- Below 85°C: the cluster runs at the highest frequency
  (e.g: 1200MHz).
- Between 85°C and 95°C: there are two trip points at half
  (e.g: 600MHz) and a third (e.g: 400MHz) of the highest frequency.
- Above 95°C the cluster runs at a quarter of the highest frequency
  (e.g: 300MHz).
- At 100°C the platform is shutdown.

Suggested-by: Omri Itach <omrii@marvell.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
This commit is contained in:
Miquel Raynal 2019-05-21 16:25:04 +02:00 committed by Gregory CLEMENT
parent b172733dd1
commit fe7f7f229f
3 changed files with 107 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/arm64/boot/dts/marvell/armada-ap806-dual.dtsi
View file

@ -20,12 +20,14 @@ cpu0: cpu@0 {
compatible = "arm,cortex-a72";
reg = <0x000>;
enable-method = "psci";
#cooling-cells = <2>;
};
cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0x001>;
enable-method = "psci";
#cooling-cells = <2>;
};
};
};

5
arch/arm64/boot/dts/marvell/armada-ap806-quad.dtsi
View file

@ -20,24 +20,29 @@ cpu0: cpu@0 {
compatible = "arm,cortex-a72";
reg = <0x000>;
enable-method = "psci";
#cooling-cells = <2>;
};
cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0x001>;
enable-method = "psci";
#cooling-cells = <2>;
};
cpu2: cpu@100 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0x100>;
enable-method = "psci";
#cooling-cells = <2>;
};
cpu3: cpu@101 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0x101>;
enable-method = "psci";
#cooling-cells = <2>;
};
};
};

110
arch/arm64/boot/dts/marvell/armada-ap806.dtsi
View file

@ -297,8 +297,6 @@ ap_thermal: thermal-sensor@80 {
*
* Only one thermal zone per AP/CP may trigger interrupts at a time, the
* first one that will have a critical trip point will be chosen.
*
* The cooling maps are always empty as there are no cooling devices.
*/
thermal-zones {
ap_thermal_ic: ap-thermal-ic {
@ -324,8 +322,31 @@ ap_thermal_cpu0: ap-thermal-cpu0 {
thermal-sensors = <&ap_thermal 1>;
trips { };
cooling-maps { };
trips {
cpu0_hot: cpu0-hot {
temperature = <85000>;
hysteresis = <2000>;
type = "passive";
};
cpu0_emerg: cpu0-emerg {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};
};
cooling-maps {
map0_hot: map0-hot {
trip = <&cpu0_hot>;
cooling-device = <&cpu0 1 2>,
<&cpu1 1 2>;
};
map0_emerg: map0-ermerg {
trip = <&cpu0_emerg>;
cooling-device = <&cpu0 3 3>,
<&cpu1 3 3>;
};
};
};
ap_thermal_cpu1: ap-thermal-cpu1 {
@ -334,8 +355,31 @@ ap_thermal_cpu1: ap-thermal-cpu1 {
thermal-sensors = <&ap_thermal 2>;
trips { };
cooling-maps { };
trips {
cpu1_hot: cpu1-hot {
temperature = <85000>;
hysteresis = <2000>;
type = "passive";
};
cpu1_emerg: cpu1-emerg {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};
};
cooling-maps {
map1_hot: map1-hot {
trip = <&cpu1_hot>;
cooling-device = <&cpu0 1 2>,
<&cpu1 1 2>;
};
map1_emerg: map1-emerg {
trip = <&cpu1_emerg>;
cooling-device = <&cpu0 3 3>,
<&cpu1 3 3>;
};
};
};
ap_thermal_cpu2: ap-thermal-cpu2 {
@ -344,8 +388,31 @@ ap_thermal_cpu2: ap-thermal-cpu2 {
thermal-sensors = <&ap_thermal 3>;
trips { };
cooling-maps { };
trips {
cpu2_hot: cpu2-hot {
temperature = <85000>;
hysteresis = <2000>;
type = "passive";
};
cpu2_emerg: cpu2-emerg {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};
};
cooling-maps {
map2_hot: map2-hot {
trip = <&cpu2_hot>;
cooling-device = <&cpu2 1 2>,
<&cpu3 1 2>;
};
map2_emerg: map2-emerg {
trip = <&cpu2_emerg>;
cooling-device = <&cpu2 3 3>,
<&cpu3 3 3>;
};
};
};
ap_thermal_cpu3: ap-thermal-cpu3 {
@ -354,8 +421,31 @@ ap_thermal_cpu3: ap-thermal-cpu3 {
thermal-sensors = <&ap_thermal 4>;
trips { };
cooling-maps { };
trips {
cpu3_hot: cpu3-hot {
temperature = <85000>;
hysteresis = <2000>;
type = "passive";
};
cpu3_emerg: cpu3-emerg {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};
};
cooling-maps {
map3_hot: map3-bhot {
trip = <&cpu3_hot>;
cooling-device = <&cpu2 1 2>,
<&cpu3 1 2>;
};
map3_emerg: map3-emerg {
trip = <&cpu3_emerg>;
cooling-device = <&cpu2 3 3>,
<&cpu3 3 3>;
};
};
};
};
};