US Patent 10209758 Graphics processing system and power gating method thereof

A graphics processing system and power gating method thereof, the graphics processing system comprising: a graphics processing unit (GPU), a bus interface and a power management unit (PMU), the GPU comprising a control circuit and a plurality of partitions; the method includes: when the bus interface receives an external graphics command, utilizing the PMU to turn on a power supply of the control circuit; subsequently utilizing the control circuit to turn on power supplies of one or more partitions of the plurality of partitions corresponding to the external graphics command; when then control circuit detects any one of the plurality of partitions is in an idle state, utilizing the control circuit to turn off the power supply of the partition in the idle state; when the bus interface detects the plurality of partitions are in a full idle state, utilizing the bus interface to turn off the power supply of the control circuit via the PMU; and when the PMU turns off the power supply of the control circuit, the control circuit may also turn off the power supplies of the plurality of the partitions.