From: "Aleš Nesrsta" <starous@volny.cz>
To: The development of GNU GRUB <grub-devel@gnu.org>
Subject: Re: Missing USB devices.
Date: Sat, 31 Aug 2013 20:10:56 +0200 [thread overview]
Message-ID: <522231B0.8080106@volny.cz> (raw)
In-Reply-To: <BBCDB0B9B472124D9EED8CB900AA04CA1F91C35E@corpappl747.corp.saab.se>
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
next prev parent reply other threads:[~2013-08-31 18:11 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 8:16 Missing USB devices Melki Christian (consultant)
2013-08-07 16:11 ` Andrey Borzenkov
2013-08-08 7:22 ` Melki Christian (consultant)
2013-08-09 18:27 ` Aleš Nesrsta
2013-08-09 22:24 ` Aleš Nesrsta
2013-08-27 11:37 ` Melki Christian (consultant)
2013-08-27 20:21 ` Aleš Nesrsta
2013-08-27 21:38 ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-08-30 22:07 ` Aleš Nesrsta
2013-09-02 7:01 ` Melki Christian (consultant)
2013-09-02 21:33 ` USB controller hand-back (original thread: Missing USB devices.) Aleš Nesrsta
2013-09-02 22:52 ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-09-03 6:52 ` Melki Christian (consultant)
2013-08-28 6:59 ` Missing USB devices Melki Christian (consultant)
2013-08-31 18:10 ` Aleš Nesrsta [this message]
2013-08-31 18:14 ` [PATCH] " Aleš Nesrsta
2013-08-31 21:12 ` Aleš Nesrsta
2013-09-02 7:17 ` Melki Christian (consultant)
2013-09-23 12:47 ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-09-23 18:38 ` Aleš Nesrsta
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