• Hans Verkuil's avatar
    [media] cx88: convert to vb2 · 0b6b6302
    Hans Verkuil authored
    As usual, this patch is very large due to the fact that half a vb2 conversion
    isn't possible. And since this affects blackbird, alsa, core, dvb, vbi and
    video the changes are all over.
    
    What made this more difficult was the peculiar way the risc program was setup.
    The driver allowed for running out of buffers in which case the DMA would stop
    and restart when the next buffer was queued. There was also a complicated
    timeout system for when buffers weren't filled. This was replaced by a much
    simpler scheme where there is always one buffer around and the DMA will just
    cycle that buffer until a new buffer is queued. In that case the previous
    buffer will be chained to the new buffer. An interrupt is generated at the
    start of the new buffer telling the driver that the previous buffer can be
    passed on to userspace.
    
    Much simpler and more robust.
    Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
    0b6b6302
cx88-mpeg.c 21.6 KB