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[PATCH] Re: Missing USB devices.


From: Aleš Nesrsta
Subject: [PATCH] Re: Missing USB devices.
Date: Sat, 31 Aug 2013 20:14:19 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130806 Thunderbird/17.0.8

Sorry, I missed the patch... :-)
There it is.

28.8.2013 08:59, Melki Christian (consultant) wrote:
I'm thinking of the EHCI hand-over. In the case of EHCI handover
beeing successful within the timeout, you never clear the USBLEGCTLSTS
register (SMI's). You do that in the other cases however. Why? I can
not think of any case of a successful handover with SMI's still
enabled. To what purpose? A buggy BIOS would maybe act upon such
stuff? Maybe thats a case for lost devices etc?
Ok, I made a short look into Linux USB source code and I saw there is
USBLEGCTLSTS register reset in any case.
(What is maybe more interesting, Linux driver DOES NOT handover on some
(broken) devices, only reset SMI...)

So I prepared simple "SMI" patch (attached).

BR,
Ales

Attachment: usb_patch_130831.diff
Description: Text Data


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