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    SubjectRe: ehci-hcd affects hda speed
    On 18-03-08 00:23, Rene Herman wrote:

    > On 17-03-08 22:00, David Brownell wrote:
    >
    >>> On 15-03-08 23:46, Lev A. Melnikovsky wrote:
    >>>
    >>>> changing the bit 5 (EHCI sleep time select: 0=1us 1=10us)
    >>>> of register 0x4B seems to resolve my own problem.
    >>
    >> Note that 10 usec is the value used in the EHCI spec.
    >>
    >> And yes, waiting only 1 usec between schedule scans is
    >> absolutely certain to hammer on the PCI bus quite rudely,
    >> preventing other devices from getting Real Work done.
    >>
    >> Could someone put together an EHCI patch to make sure
    >> that bit is set on vt6212 parts? For the VT8235 that
    >> register seems to be marked (in an old document someone
    >> forwarded to me) as "reserved, do not program"; so this
    >> should be specific to vt6212 EHCI. (PCI vendor 0x1106,
    >> device 0x3104, revision 0x60 ... the revision being what
    >> says "vt6212" vs "vt8235" or "vt8237" etc.
    >
    > Just something like this? Completely untested as I've not the hardware
    > anymore. Googling for an old lspci, I had a revision 0x63, and Lev has a
    > revision 0x65. The VT6212(L) should be 0x60+ it seems.
    >
    > The "CC:" should be a "Tested-by:" if that's actually the case.
    >
    > But yes, as he also asked, should this be the fix at all?

    And, as usual, I can not reach Lev as some mailer along the way is telling
    me his address is unroutable.

    Rene.


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