Device-dependent peak power throttling for battery-operated systems
An information handling system (IHS) includes a source load switch connected to a power management circuit, and a port for connection of a device. The IHS detects attachment of the device to the port, and determines whether the device is a current sink. When the device is a current sink, the IHS sets the peak processor power level to a reduced level, determines detachment of the device, and in response to determining detachment of the device, restores a maximum peak processor power level. When the device is not a current sink, the HIS starts charging, sets a dynamic peak processor power level to an AC+DC setting, determines detachment of the device, and in response to determining detachment of the device, sets the peak processor power level to a DC-only setting.
1. An information handling system (IHS) comprising:
a battery;
a power management circuit connected to the battery;
a source load switch connected to the power management circuit; and
a port for connection of a device, wherein the IHS detects attachment of the device to the port; determines whether the device is a current sink; when the device is a current sink, sets a peak processor power level to a reduced level, determines detachment of the device, and in response to determining detachment of the device, restores a maximum peak processor power level; and, when the device is not a current sink, starts charging, sets a dynamic peak processor power level to an AC+DC setting, determines detachment of the device, and in response to determining detachment of the device, sets the peak processor power level to a DC-only setting.
2. The IHS of claim 1 , wherein the IHS sets the peak processor power level to a reduced level by setting, by an enclosure controller (EC), the peak processor power level to the peak processor power level minus an amount of power.
3. The IHS of claim 1 , wherein the IHS sets the peak processor power level to a reduced level by triggering, by a power delivery (PD) circuit, a Soft PROCHOT# source mode and throttling, by a system-on-a-chip (SoC), the peak processor power level per settings in a register of the SoC.
4. The IHS of claim 1 , wherein, when the device is a current sink, the IHS turns on a source load switch.
5. The IHS of claim 1 , wherein the IHS performs power-data objects (PDO) negotiation.
6. The IHS of claim 1 , wherein, when the device is a current sink, the IHS adjusts the peak processor power level as needed.
7. The IHS of claim 1 , wherein the IHS inhibits immediate assertion of a native hardware processor-hot (PROCHOT#) signal.
8. A method comprising:
detecting attachment of a device;
determining whether the device is a current sink;
when the device is a current sink:
setting, by an enclosure controller (EC), a peak processor power level to the peak processor power level minus an amount of power;
determining detachment of the device; and
in response to determining detachment of the device, restoring a maximum peak processor power level; and
when the device is not a current sink:
starting charging;
setting a dynamic peak processor power level to an AC+DC setting;
determining detachment of the device; and
in response to determining detachment of the device, setting the peak processor power level to a DC-only setting.
9. The method of claim 8 , further comprising:
when the device is a current sink, turning on a source load switch.
10. The method of claim 8 , further comprising:
performing power-data objects (PDO) negotiation.
11. The method of claim 8 , further comprising:
when the device is a current sink, adjusting the peak processor power level as needed.
12. The method of claim 8 , wherein the method is implemented in a battery-operated system.
13. The method of claim 8 further comprising:
inhibiting immediate assertion of a native hardware processor-hot (PROCHOT#) signal.
14. A method comprising:
detecting attachment of a device;
if the device is a current sink, then:
triggering, by a power delivery (PD) circuit, a Soft PROCHOT# source mode;
throttling, by a system-on-a-chip (SoC), a peak processor power level per settings in a register of the SoC; and
if the device is detached, then restoring a maximum peak processor power level; and
otherwise:
starting charging;
setting a dynamic peak processor power level to an AC+DC setting; and
if the device is not detached, then setting the peak processor power level to a DC-only setting.
15. The method of claim 14 , further comprising:
when the device is a current sink, turning on a source load switch.
16. The method of claim 14 , further comprising:
performing power-data objects (PDO) negotiation.
17. The method of claim 14 , further comprising:
when the device is a current sink, adjusting the peak processor power level as needed.
18. The method of claim 14 , wherein the method is implemented in a battery-operated system.
19. The method of claim 14 , wherein the SoC comprises a secondary processor-hot circuit (PROCHOT2#).
20. The method of claim 14 further comprising:
inhibiting immediate assertion of a native hardware processor-hot (PROCHOT#) signal.