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    SubjectRe: sdio: enhance IO_RW_EXTENDED support
    On Mon, 06 Aug 2007 11:31:19 +0100
    David Vrabel <> wrote:

    > I would expect the block size to be set once per card, and never be
    > changed and thus it's not logically a per-transfer operation. We
    > certainly wouldn't want to change the block size willy-nilly as it's
    > an expensive operation.

    Indeed. It would of course be optimized so that it doesn't change the
    size needlessly.

    The beauty is that drivers wouldn't have to care. Things just
    work<tm>. :)

    > > I suspect that some transactions might require a certain block size.
    > > But we could satisfy that by stating that any transfer small enough
    > > to fit into one block will not be split up.
    > I consider it unlikely that any card would want to do anything other
    > than always use the largest possible block size.

    I have a counter example. I have here a Marvell wifi card which needs a
    firmware upload. And it seems to be rather picky about parameters
    during that upload.

    I'm still experimenting with a clean way to do things for this card.
    I'll get back to you. :)

    -- Pierre Ossman

    Linux kernel, MMC maintainer
    PulseAudio, core developer
    rdesktop, core developer
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      Last update: 2007-08-06 17:15    [W:0.023 / U:22.232 seconds]
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