23.10.2020 13:26, Chanwoo Choi пишет: > The devfreq governor is able to have the specific flag as follows > in order to implement the specific feature. For example, devfreq allows > user to change the governors on runtime via sysfs interface. > But, if devfreq device uses 'passive' governor, don't allow user to change > the governor. For this case, define the DEVFREQ_GOV_FLAG_IMMUTABLE > and set it to flag of passive governor. > > [Definition for governor flag] > - DEVFREQ_GOV_FLAG_IMMUTABLE > : If immutable flag is set, governor is never changeable to other governors. > - DEVFREQ_GOV_FLAG_IRQ_DRIVEN > : Devfreq core won't schedule polling work for this governor if value is set. > > [Table of governor flag for devfreq governors] > ------------------------------------------------------------------------------ > | simple | perfor | power | user | passive | tegra30 > | ondemand | mance | save | space| | > ------------------------------------------------------------------------------ > immutable | X | X | X | X | O | O > interrupt_driven | X(polling)| X | X | X | X | O (irq) > ------------------------------------------------------------------------------ > > Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> > --- Reviewed-by: Dmitry Osipenko <digetx@xxxxxxxxx> Tested-by: Dmitry Osipenko <digetx@xxxxxxxxx>
