On Sat, Aug 02, 2014 at 04:17:14PM +0100, Russell King - ARM Linux wrote: > On Sat, Aug 02, 2014 at 04:49:25PM +0200, Maxime Ripard wrote: > > In the case of the call to device_control, especially in the > > DMA_SLAVE_CONFIG case, but that also applies to pause/resume, are the > > changes supposed to be immediates or can they happen later? > > pause/resume are expected to operate synchronously on the channel. > When asking for the channel to pause, the channel must be stopped > before the call returns. > > In the case of channel configuration, that should have no effect on > any previously queued transfer - in other words, changing the channel > configuration only has an effect when subsequent transactions are > prepared. Ok, thanks! -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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