On Tue, Jun 08, 2010 at 04:03:20PM -0700, Bryan Huntsman wrote: > >>http://lkml.org/lkml/2010/4/22/213 (I guess the details are in the > >>archives) I'm happy to re-visit it. > >> > > > >Interesting patch, it looks like having a "system wide bus" doesn't > >easily apply to msm and tegra platforms. > >An example of some things I would like to be able to control are i2c > >and memory bus. > > > >I'm tempted to suggest adding two types memory and i2c but I'm not > >sure how future proof this will be given the growing complexity in the > >embedded hardware road-map. > >What about the possibility of registering not one but several buses? > >You could add a bus qos param, with a type enum, or bind to some > >platform_driver or bus_driver > > > >Then there's the issue of having to deal with platform specific buses, > >do you add this type to pm qos with only one user? Or have some > >platform bus types defined somewhere. The generic code of min / max > >for resource X can be useful so everyone doesn't spin their own > >resource framework in their own architecture. > > > >-- Mike > > Mike, one idea I'm exploring is having platform-specific busses with > QoS constraints specified via runtime_pm as part of the LDM. Adding > dynamic class creation within pm_qos, or a type enum as you suggest, > would work. However, I think this kind of behavior would fit nicely > within runtime_pm. > Something like that is what Kevin Hilman was thinking too. It would bring a qos concept to the LDM for each bus driver object. Picking what qos parameters to use (I recommend latency and bandwidth) and how "local" the parameters effect of these bus_qos interfaces are. They are not the same as the more global system wide pm_qos parameters, and they would be unlikely things ever exposed to usermode. Yes I think something like this is inevitable and will happen. But we need some good applications to roll out the idea with. (I think.) --mgross _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
