From: David Brownell <david-b@pacbell.net>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: USB list <linux-usb@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: quirk_usb_disable_ehci takes 2x 1.5s on boot
Date: Mon, 5 Jan 2009 14:44:40 -0800 [thread overview]
Message-ID: <200901051444.41232.david-b@pacbell.net> (raw)
In-Reply-To: <49620DF7.9040006@gmail.com>
On Monday 05 January 2009, Jiri Slaby wrote:
> Hi,
>
> I don't know since which moment (maybe I changed something in bios, but usb
> legacy kbd was ever enabled), but quirk_usb_disable_ehci takes for both of my
> ehci controllers 1.5 s.
>
> More precisely, the time is spent in
> pci_write_config_byte(pdev, offset + 3, 1);
> by
> outb((u8)value, 0xCFC + (reg & 3));
> from pci_conf1_write deep in the callstack.
>
> Is there any workaround known or something.
I've never heard of pci_write_config_byte() taking enough time
to be visible without a PCI bus analyser... sorry, no clue.
- Dave
> Turning legacy usb off is not an
> option, I want to control grub.
>
> Thanks.
>
>
next prev parent reply other threads:[~2009-01-05 22:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-05 13:41 quirk_usb_disable_ehci takes 2x 1.5s on boot Jiri Slaby
2009-01-05 22:44 ` David Brownell [this message]
2009-01-06 0:36 ` Robert Hancock
2009-02-24 13:32 ` Jiri Slaby
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