On 22/07/2019 17:37, Lorenzo Pieralisi wrote: > PSCI firmware is the standard power management control for > all ARM64 based platforms and it is also deployed on some > ARM 32 bit platforms to date. > > Idle state entry in PSCI is currently achieved by calling > arm_cpuidle_init() and arm_cpuidle_suspend() in a generic > idle driver, which in turn relies on ARM/ARM64 CPUidle back-end > to relay the call into PSCI firmware if PSCI is the boot method. > > Given that PSCI is the standard idle entry method on ARM64 systems > (which means that no other CPUidle driver are expected on ARM64 > platforms - so PSCI is already a generic idle driver), in order to > simplify idle entry and code maintenance, it makes sense to have a PSCI > specific idle driver so that idle code that it is currently living in > drivers/firmware directory can be hoisted out of it and moved > where it belongs, into a full-fledged PSCI driver, leaving PSCI code > in drivers/firmware as a pure firmware interface, as it should be. > > Implement a PSCI CPUidle driver. By default it is a silent Kconfig entry > which is left unselected, since it selection would clash with the > generic ARM CPUidle driver that provides a PSCI based idle driver > through the arm/arm64 arches back-ends CPU operations. > > Signed-off-by: Lorenzo Pieralisi <[email protected]> > Cc: Ulf Hansson <[email protected]> > Cc: Sudeep Holla <[email protected]> > Cc: Daniel Lezcano <[email protected]> > Cc: Mark Rutland <[email protected]> > Cc: "Rafael J. Wysocki" <[email protected]> > ---
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