Hi, On Tue, 21 Feb 2017, Ajay kumar wrote: > Hi Everyone, > > On Fri, Feb 17, 2017 at 7:27 PM, Thomas Axelsson > <Thomas.Axelsson@xxxxxxxxxxxx> wrote: > > Hi, > > > > I have a v4l2_subdev that provides multiple MIPI CSI-2 Virtual > > Channels. I want to configure each virtual channel individually (e.g. > > set_fmt), but the v4l2 interface does not seem to have a clear way to > > access configuration on a virtual channel level, but only the > > v4l2_subdev as a whole. Using one v4l2_subdev for multiple virtual > > channels by extending the "reg" tag to be an array looks like the > > correct way to do it, based on the mipi-dsi-bus.txt document and > > current device tree endpoint structure. > > > > However, I cannot figure out how to extend e.g. set_fmt/get_fmt subdev > > ioctls to specify which virtual channel the call applies to. Does > > anyone have any advice on how to handle this case? > This would be helpful for my project as well since even I need to > support multiple streams using Virtual Channels. > Can anyone point out to some V4L2 driver, if this kind of support is > already implemented? My understanding is, that MIPI CSI virtual channel handling requires extensions to the V4L2 subdev API. These extensions have been discussed at a media mini-summit almost a year ago, slides are available at [1], but as my priorities shifted away from this work, don't think those extensions ever got implemented. Thanks Guennadi [1] https://linuxtv.org/downloads/presentations/media_summit_2016_san_diego/v4l2-multistream.pdf > > Thanks. > > > > Previous thread: "Device Tree formatting for multiple virtual channels in ti-vpe/cal driver?" > > > > > > Best Regards, > > Thomas Axelsson > > > > PS. First e-mail seems to have gotten caught in the spam filter. I apologize if this is a duplicate. >
