linux-kernel - Re: quirk_usb_disable_ehci takes 2x 1.5s on boot

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Message-Id: <200901051444.41232.david-b@pacbell.net>
Date:	Mon, 5 Jan 2009 14:44:40 -0800
From:	David Brownell <david-b@...bell.net>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	USB list <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: quirk_usb_disable_ehci takes 2x 1.5s on boot

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.
> 
> 


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