On Thu, 28 Oct 2010, Ohad Ben-Cohen wrote: > On Thu, Oct 28, 2010 at 5:39 PM, Kishore Kadiyala > <kishorek.kadiyala@xxxxxxxxx> wrote: > > Wouldn't adapting the host driver just to PM-Runtime will answer the > > above issues? > > It's not enough. > > When the card is runtime suspended, sure, the host controller will > immediately get idle notification by runtime PM core. > > But you may still want to gate the clock to the host controller on bus > inactivity, even if the card is not runtime suspended. The decision to > do this should come from the mmc core. This is not clear that this is something that the core can effectively help with. Opportunistic power saving at the host controller level is pretty much hardware dependent and may wildly vary in capabilities... and bugs. So in this later case I think the driver for the host controller is the best place to just set up a timer and gate the clock after a certain period of inactivity for example. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
