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    SubjectRe: [PATCH 2/4 v4] i.MX31: Image Processing Unit DMA and IRQ drivers
    On Tue, Dec 23, 2008 at 11:50:06AM +0100, Sascha Hauer wrote:
    > > You mean an output v4l device? I think overlays are handled by framebuffer
    > > drivers... But I'm also not quite sure about it, however, handling overlay
    > > as another framebuffer seems logical to me.
    > Well the DMA engine seems to suggest that frames should be passed around
    > whereas the framebuffer API only has a single frame. That would fit
    > better into the v4l API. Also the IPU can do things like colourspace
    > conversion and hw scaling which would fit into the V4L API.

    Looks like a candidate for gstreamer on the userspace end. Can it be
    decoupled enough to make proper plugins out of it?

    > BTW is the overlay framebuffer useful in it's current implementation?
    > There seems to be no way to adjust the x/y offset or the blending
    > modes.

    The API Eric Miao just posted for the PXA looks sane to me.

    > > If there are no other problems with v5, could we maybe take it as a
    > > basis and then I would submit a patch to reduce the number of IRQs?
    > Please understand my concerns with this driver. It's a quite complex
    > beast and experience shows that once a driver is in the kernel it is
    > far more complicated to change it than to do it right the first way.

    Especially when it comes to userspace visible things.

    > You know that I'm also interested in having a MX31 framebuffer (and
    > camera) driver in kernel but I want to make sure that it works
    > properly and leaves room for feature enhancements without having to
    > refactor the whole driver.

    Yup, looks like it would be better to cook it another round instead of
    trying to bring in a half-tested driver with brute-force.

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