On Nov 6, 2010, at 6:44 PM, Nicolas Pitre wrote: > On Sat, 6 Nov 2010, Philip Rakity wrote: > >> >> We need a way to specify >> >> a) Hardware can support clock gating setting the clock to 0 in the >> call to set_ios (with hardware clock gating enabled) becomes a no-op >> so some care is needed which is why I suggested another field in the >> ios structure. > > Why should the core code care? > > What difference is there with the core telling the controller driver to > set the clock to a frequency of 0 ? > > > Nicolas
When h/w clock gating is enabled then sd clocks are disabled/enabled by the sd controller; there is nothing for the core/ layer to do. I am concerned that having the core/ layer ask for clocks off and on is a) not needed when h/w clock gating is enabled b) may invoke bad behavior in the controller c) is not optimal since the h/w is already handling this. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
