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:

quoted

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@sntech.de>

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