• Benjamin Herrenschmidt's avatar
    [PATCH] ppc32: Fix cpufreq vs. sleep issue · b16eeb47
    Benjamin Herrenschmidt authored
    
    
    Recent kernels occasionally trigger a PMU timeout on some mac laptops,
    typically on wakeup from sleep.  This seem to be caused by either a too big
    latency caused by the cpufreq switch on wakeup from sleep or by an
    interrupt beeing lost due to the reset of the interrupt controller done
    during wakeup.
    
    This patch makes that code more robust by stopping PMU auto poll activity
    around cpufreq changes on machines that use the PMU for such changes (long
    latency switching involving a CPU hard reset and flush of all caches) and
    by removing the reset of the open pic interrupt controller on wakeup (that
    can cause the loss of an interrupt and Darwin doesn't do it, so it must not
    be necessary).
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    b16eeb47
open_pic.c 27.9 KB