On Wed, 31 Oct 2012 15:41:03 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote: > Communicating via the mailbox registers with the PCU can take quite > awhile. And updating the ring frequency or enabling turbo is not > something that needs to happen synchronously, so take it out of our init > and resume paths to speed things up (~200ms on my T420). > > v2: add comment about why we use a work queue (Daniel) > make sure work queue is idle on suspend (Daniel) > use a delayed work queue since there's no hurry (Daniel) > v3: make cleanup symmetric and just call cancel work directly (Daniel) > > References: https://bugs.freedesktop.org/show_bug.cgi?id=54089 Use round_jiffies_up_relative(HZ) to compute the delay to align the wakeup with others. -Chris -- Chris Wilson, Intel Open Source Technology Centre
