Quoting Tvrtko Ursulin (2018-02-08 08:50:58) > > On 08/02/2018 08:00, Chris Wilson wrote: > > The other part of the puzzle was perhaps just using a timer to read the > > registers every 1/2 wrap period, but there was no clear picture on when > > to start and stop that timer for sysfs. However, with perf we can create > > and destroy a background timer on PMU open/destroy. > > > > Fancy hooking up a background timer? > > Could do, wasn't sure that the complication is worth it. Just thought about 10m work to make sure it's done and dusted. However, wait and see if Len's happy is a fair policy. > Idea would be to schedule a timer for instance, as you say, 1/2 wrap > period, and keep pushing it forward on manual reads. > > But then question of runtime suspend arises again. If we decide to > estimate the counter, as in the case of PMU, then I need to move that > code out of PMU and make intel_pm.c the one and only authoritative > source of RC6 data. The timer would also entail waking up the device every 30m. One more reason to loathe adding a timer (and trying to make sure the timer is only run as required). -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
