08 May, 2009

16 commits


07 May, 2009

5 commits


03 May, 2009

14 commits


02 May, 2009

2 commits

  • Some arches don't supply their own clocksource. This is mainly the
    case in architectures that get their inter-tick times by reading the
    counter on their interval timer. Since these timers wrap every tick,
    they're not really useful as clocksources. Wrapping them to act like
    one is possible but not very efficient. So we provide a callout these
    arches can implement for use with the jiffies clocksource to provide
    finer then tick granular time.

    [ Impact: ease the migration to generic time keeping ]

    Signed-off-by: John Stultz
    Signed-off-by: Andrew Morton
    Signed-off-by: Thomas Gleixner

    john stultz
     
  • Setup clocksource mult_orig in clocksource_enable().

    Clocksource drivers can save power by using keeping the
    device clock disabled while the clocksource is unused.

    In practice this means that the enable() and disable()
    callbacks perform clk_enable() and clk_disable().

    The enable() callback may also use clk_get_rate() to get
    the clock rate from the clock framework. This information
    can then be used to calculate the shift and mult variables.

    Currently the mult_orig variable is setup from mult at
    registration time only. This is conflicting with the above
    case since the clock is disabled and the mult variable is
    not yet calculated at the time of registration.

    Moving the mult_orig setup code to clocksource_enable()
    allows us to both handle the common case with no enable()
    callback and the mult-changed-after-enable() case.

    [ Impact: allow dynamic clock source usage ]

    Signed-off-by: Magnus Damm
    LKML-Reference:
    Signed-off-by: Thomas Gleixner

    Magnus Damm
     

30 Apr, 2009

3 commits