On Mon, 28 Jul 2008, Robert Jarzmik wrote: > Guennadi Liakhovetski <g.liakhovetski@xxxxxx> writes: > > > On Sun, 27 Jul 2008, Robert Jarzmik wrote: > > > > Yes, this is the difference. The sensor is attached to the camera host > > only on open. In fact, I am not sure, how video applications should behave > > during a suspend / resume cycle. If you suspend, while, say, recording > > from your camera, should you directly continue recording after a wake up? > > How do currect drivers implement this? Or, in general, for example with > > audio - if you suspend while listening to a stream over the net, or to a > > CD, or to a mp3-file on your local disk, should the sound resume after a > > wake up? I added linux-pm for some authoritative answers:-) > AFAIK, on resume, sound streams continues. So the normal behaviour would be to > continue video stream too (as done in ALSA). This supposes the whole video chip > state is saved on suspend and restored on resume, of course. Ok, that's what I also thought. > > If you know how a v4l2 device should handle suspend/resume, or when we get > > some answers, let's try to do it completely- > Of course. In a week or two, my mt9m111 driver will be ready for submission, and > in the review process I'll post a submission for complete suspend/resume. > > >> For the camera part, by now, I'm using standard suspend/resume functions of the > >> platform driver (mt9m111.c). It does work, but it's not clean ATM. The chaining > >> between the driver resume function and the availability of the I2C bus are not > >> properly chained. I'm still working on it. > > > > Yes, we have to clarify this too. > Yes. > > So, to sum up : > - I finish the mt9m111 driver > - I submit it > - I cook up a clean suspend/resume (unless you did it first of course :) Good plan! You don't have to worry - I will not do this before you:-) And, I am still waiting for the patch to move .power and .reset to camera-link (see my another post on the V4L ML today). With that patch in place your power-management would also become easier and more logical. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
