Hi Florian, Am Donnerstag, 16. Februar 2012, 03:27:25 schrieb Florian Tobias Schandinat: > Hi Heiko, > > sorry for the long delay. no problem > On 12/31/2011 10:45 AM, Heiko Stübner wrote: > > With this optional callback the driver is notified when the first page > > is entered into the pagelist and a new deferred_io call is scheduled. > > > > A possible use-case for this is runtime-pm. In the first_io call > > > > pm_runtime_get() > > > > could be called, which starts an asynchronous runtime_resume of the > > device. In the deferred_io callback a call to > > > > pm_runtime_barrier() > > > > makes the sure, the device is resumed by then and a > > > > pm_runtime_put() > > > > may put the device back to sleep. > > > > Also, some SoCs may use the runtime-pm system to determine if they > > are able to enter deeper idle states. Therefore it is necessary to > > keep the use-count from the first written page until the conclusion > > of the screen update, to prevent the system from going to sleep before > > completing the pending update. > > > > Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> > > while I consider this patch acceptable, I don't see any reason to apply it > as long as there is no driver actually using it. ok, so I will keep sitting on it until my driver for the AUO-K190x epd controller is ready for primetime and resubmit this patch in conjunction with it. Heiko -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
