Mainline:Broadcom Kona/Clocks: Difference between revisions
import from my personal docs |
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Before making any changes to the policy or one of the controls below, the policy engine must first be stopped. Restarting the policy engine will apply the changes to it. | Before making any changes to the policy or one of the controls below, the policy engine must first be stopped. Restarting the policy engine will apply the changes to it. | ||
Starting the policy engine is done by writing to the policy control offset, either: * the ATL (active load) bit for synchronous requests (we wait for the frequency and voltage to stabilize); * or clearing it for asynchronous requests, going into target mode (where the voltage ramps in the background, then the target load is copied to the active load triggering a frequency change). | Starting the policy engine is done by writing to the policy control offset, either: | ||
* the ATL (active load) bit for synchronous requests (we wait for the frequency and voltage to stabilize); | |||
* or clearing it for asynchronous requests, going into target mode (where the voltage ramps in the background, then the target load is copied to the active load triggering a frequency change). | |||
The above is more or less abridged from the mainline driver's docs: | The above is more or less abridged from the mainline driver's docs: | ||