On Mon, Jun 04, 2012 at 11:21:13PM +0800, Bhupesh SHARMA wrote: > Hi Felipe, > > > -----Original Message----- > > From: Felipe Balbi [mailto:balbi@xxxxxx] > > Sent: Monday, June 04, 2012 8:44 PM > > To: Bhupesh SHARMA > > Cc: laurent.pinchart@xxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; > > balbi@xxxxxx; linux-media@xxxxxxxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx > > Subject: Re: [PATCH 4/5] usb: gadget/uvc: Port UVC webcam gadget to use > > videobuf2 framework > > > > On Fri, Jun 01, 2012 at 03:08:57PM +0530, Bhupesh Sharma wrote: > > > This patch reworks the videobuffer management logic present in the > > UVC > > > webcam gadget and ports it to use the "more apt" videobuf2 framework > > > for video buffer management. > > > > > > To support routing video data captured from a real V4L2 video capture > > > device with a "zero copy" operation on videobuffers (as they pass > > from > > > the V4L2 domain to UVC domain via a user-space application), we need > > > to support USER_PTR IO method at the UVC gadget side. > > > > > > So the V4L2 capture device driver can still continue to use MMAO IO > > > method and now the user-space application can just pass a pointer to > > > the video buffers being DeQueued from the V4L2 device side while > > > Queueing them at the UVC gadget end. This ensures that we have a > > > "zero-copy" design as the videobuffers pass from the V4L2 capture > > device to the UVC gadget. > > > > > > Note that there will still be a need to apply UVC specific payload > > > headers on top of each UVC payload data, which will still require a > > > copy operation to be performed in the 'encode' routines of the UVC > > gadget. > > > > > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxx> > > > > this patch doesn't apply. Please refresh on top of v3.5-rc1 or my > > gadget branch which I will update in a while. > > > > I rebased and submitted my changes on your "gadget-for-v3.5" tag. > Should I now refresh my patches on top of your "v3.5-rc1" branch ? > > I am a bit confused on what is the latest gadget branch to be used now. > Thanks for helping out. The gadget branch is the branch called gadget on my kernel.org tree. For some reason this didn't apply. Probably some patches on drivers/usb/gadget/*uvc* went into v3.5 without my knowledge. Possibly because I was out for quite a while and asked Greg to help me out during the merge window. Anyway, I just pushed gadget with a bunch of new patches and part of your series. -- balbi
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