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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.


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