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arm64: dts: apple: t6040-j616s: Shed CPU power at the GPU firmware limit #511

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arm64: dts: apple: t6040-j616s: Shed CPU power at the GPU firmware limit #511

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28 changes: 16 additions & 12 deletions arch/arm64/boot/dts/apple/t6040-j616s.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -311,11 +311,15 @@
* failure of that loop; they never act in normal use.
*
* The GPU has no cooling device of its own: its firmware sets the GPU
* performance state. The seven hottest GPU die sensors (Tg05, Tg0S,
* Tg0Y, Tg0k, Tg0z, Tg1V, Tg1l) shed package power through the CPU
* clusters from 105 C, above the 103.8 C peak measured during
* conformance runs, and shut down at 118 C. While the GPU is powered
* off its sensors report placeholder values from -4 to 4 C.
* performance state and starts limiting at 101 C. The SMC runs the
* fans in its own mode (3), only at their minimum speed in every load
* measured under Linux, and refuses manual fan modes from the OS. So
* when a GPU die sensor reaches the GPU firmware's limit, the seven
* hottest ones (Tg05, Tg0S, Tg0Y, Tg0k, Tg0z, Tg1V, Tg1l) also shed
* CPU power through the CPU clusters, from the same 101 C, leaving the
* shared heat budget to the GPU. They shut down at 118 C. While the
* GPU is powered off its sensors report placeholder values from -4 to
* 4 C.
*/
thermal-zones {
cpu-die-thermal {
Expand Down Expand Up @@ -884,7 +888,7 @@

trips {
gpu0_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down Expand Up @@ -935,7 +939,7 @@

trips {
gpu1_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down Expand Up @@ -986,7 +990,7 @@

trips {
gpu2_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down Expand Up @@ -1037,7 +1041,7 @@

trips {
gpu3_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down Expand Up @@ -1088,7 +1092,7 @@

trips {
gpu4_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down Expand Up @@ -1139,7 +1143,7 @@

trips {
gpu5_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down Expand Up @@ -1190,7 +1194,7 @@

trips {
gpu6_passive: trip-passive {
temperature = <105000>;
temperature = <101000>;
hysteresis = <5000>;
type = "passive";
};
Expand Down