• Mark Brown's avatar
    regulator: Do bulk enables of regulators in parallel · f21e0e81
    Mark Brown authored
    In order to reduce the impact of ramp times rather than enabling the
    regulators for a device in series use async tasks to run the actual
    enables. This means that the delays which the enables implement can all
    run in parallel, though it does mean that the order in which the
    supplies come on may be unstable.
    
    For super bonus fun points if any of the regulators are shared between
    multiple supplies on the same device (as is rather likely) then this
    will test our locking.  Note that in this case we only delay once for
    each physical regulator so the threads shouldn't block each other while
    delaying.
    
    It'd be even nicer if we could coalesce writes to a shared enable registers
    in PMICs but that's definitely future work, and it may also be useful
    and is certainly more achievable to optimise out the parallelism if none
    of the regulators implement ramp delays.
    Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
    f21e0e81
core.c 75.8 KB