Messages in this thread | | | From | Oliver Neukum <> | Subject | Re: ehci-hcd affects hda speed | Date | Thu, 17 Apr 2008 10:20:11 +0200 |
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Am Donnerstag, 17. April 2008 00:23:08 schrieb Lev A. Melnikovsky: > Oliver, > > ON> EHCI should not scan an empty async. However this manufacturer > ON> has shown a liberal attitude about conforming with specifications. > ON> If the root hub is suspended, it can't do DMA. So it might help. > Yes, it does, thank you. No DMA when suspended. Auto-suspend is executed > if external hub is the only attached device. Can this be used to block > spurious schedule traversal?
Obviously, yes, if only hubs are attached. The question is whether it should be. It would be better to find a way to fix the chip bug in the active state. However, as fixing all hardware bugs for that vendor may be difficult I wanted to test whether a partial work around is available.
Regards Oliver
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