On 24-12-20, 16:00, Dmitry Osipenko wrote: > In a device driver I want to set PD to the lowest performance state by > removing the performance vote when dev_pm_opp_set_rate(dev, 0) is > invoked by the driver. > > The OPP core already does this, but if OPP levels don't start from 0 in > a device-tree for PD, then it currently doesn't work since there is a > need to get a rounded-up performance state because > dev_pm_opp_set_voltage() takes OPP entry for the argument (patches 9 and > 28). > > The PD powering off and performance-changes are separate from each other > in the GENPD core. The GENPD core automatically turns off domain when > all devices within the domain are suspended by system-suspend or RPM. > > The performance state of a power domain is controlled solely by a device > driver. GENPD core only aggregates the performance requests, it doesn't > change the performance state of a domain by itself when device is > suspended or resumed, IIUC this is intentional. And I want to put domain > into lowest performance state when device is suspended. Right, so if you really want to just drop the performance vote, then with a value of 0 for the performance state the call will reach to your genpd's callback ->set_performance_state(). Just as dev_pm_opp_set_rate() accepts the frequency to be 0, I would expect dev_pm_opp_set_rate() to accept opp argument as NULL and in that case set voltage to 0 and do regulator_disable() as well. Won't that work better than going for the lowest voltage ? -- viresh
