Messages in this thread | | | Date | Tue, 18 Mar 2008 00:26:50 +0100 | From | Rene Herman <> | Subject | Re: ehci-hcd affects hda speed |
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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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