linux-kernel - Re: [PATCH 1/1] drivers/usb/host/pci-quirks.c: wait for EHCI handoff far too long in quirk_usb_disable

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Date:	Mon, 8 Sep 2008 21:44:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Noonan <steven.noonan@...inklabs.net>
Cc:	linux-kernel@...r.kernel.org,
	Steven Noonan <steven@...inklabs.net>,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/1] drivers/usb/host/pci-quirks.c: wait for EHCI
 handoff far too long in quirk_usb_disable_ehci()


(cc linux-usb)

On Sat,  6 Sep 2008 17:29:53 -0700 Steven Noonan <steven.noonan@...inklabs.net> wrote:

> This patch fixes a very noticeable bootup delay on some
> systems (in my particular case, an HP dv5178us). The
> problem is caused by a buggy BIOS which doesn't properly
> announce that the handoff was completed.
> 
> The delay in the current version of pci-quirks.c is 5 seconds,
> which I've cut down to 0.5 seconds.
> 
> Signed-off-by: Steven Noonan <steven@...inklabs.net>
> ---
>  drivers/usb/host/pci-quirks.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index ae6e70e..9a3609a 100644
> --- a/drivers/usb/host/pci-quirks.c
> +++ b/drivers/usb/host/pci-quirks.c
> @@ -271,7 +271,7 @@ static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
>  			/* if boot firmware now owns EHCI, spin till
>  			 * it hands it over.
>  			 */
> -			msec = 5000;
> +			msec = 500;
>  			while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
>  				tried_handoff = 1;
>  				msleep(10);

I guess it risks breaking someone else's system.  Or perhaps the number
was just grabbed out of the air.

Can we do a separate quirk just for that machine (and ones with the
same bug)?

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