linux-kernel - Re: [ 116/167] [PATCH] USB: EHCI: fix crash during suspend on ASUS computers

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Message-ID: <4FAA0DC8.5050602@fisher-privat.net>
Date:	Wed, 09 May 2012 08:25:12 +0200
From:	Oleksij Rempel <bug-track@...her-privat.net>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrey Rahmatullin <wrar@...r.name>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 116/167] [PATCH] USB: EHCI: fix crash during suspend on ASUS
 computers

What is actually with acpi fix of this problem? Will be this patch
removed and acpi fix applied instead?

Am 09.05.2012 07:52, schrieb Ben Hutchings:
> 3.2-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Alan Stern <stern@...land.harvard.edu>
> 
> commit 151b61284776be2d6f02d48c23c3625678960b97 upstream.
> 
> This patch (as1545) fixes a problem affecting several ASUS computers:
> The machine crashes or corrupts memory when going into suspend if the
> ehci-hcd driver is bound to any controllers.  Users have been forced
> to unbind or unload ehci-hcd before putting their systems to sleep.
> 
> After extensive testing, it was determined that the machines don't
> like going into suspend when any EHCI controllers are in the PCI D3
> power state.  Presumably this is a firmware bug, but there's nothing
> we can do about it except to avoid putting the controllers in D3
> during system sleep.
> 
> The patch adds a new flag to indicate whether the problem is present,
> and avoids changing the controller's power state if the flag is set.
> Runtime suspend is unaffected; this matters only for system suspend.
> However as a side effect, the controller will not respond to remote
> wakeup requests while the system is asleep.  Hence USB wakeup is not
> functional -- but of course, this is already true in the current state
> of affairs.
> 
> This fixes Bugzilla #42728.
> 
> Signed-off-by: Alan Stern <stern@...land.harvard.edu>
> Tested-by: Steven Rostedt <rostedt@...dmis.org>
> Tested-by: Andrey Rahmatullin <wrar@...r.name>
> Tested-by: Oleksij Rempel (fishor) <bug-track@...her-privat.net>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> [bwh: Backported to 3.2: adjust context]
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
>  drivers/usb/core/hcd-pci.c  |    9 +++++++++
>  drivers/usb/host/ehci-pci.c |    8 ++++++++
>  include/linux/usb/hcd.h     |    2 ++
>  3 files changed, 19 insertions(+)
> 
> --- linux.orig/drivers/usb/core/hcd-pci.c
> +++ linux/drivers/usb/core/hcd-pci.c
> @@ -495,6 +495,15 @@
>  
>  	pci_save_state(pci_dev);
>  
> +	/*
> +	 * Some systems crash if an EHCI controller is in D3 during
> +	 * a sleep transition.  We have to leave such controllers in D0.
> +	 */
> +	if (hcd->broken_pci_sleep) {
> +		dev_dbg(dev, "Staying in PCI D0\n");
> +		return retval;
> +	}
> +
>  	/* If the root hub is dead rather than suspended, disallow remote
>  	 * wakeup.  usb_hc_died() should ensure that both hosts are marked as
>  	 * dying, so we only need to check the primary roothub.
> --- linux.orig/drivers/usb/host/ehci-pci.c
> +++ linux/drivers/usb/host/ehci-pci.c
> @@ -144,6 +144,14 @@
>  			hcd->has_tt = 1;
>  			tdi_reset(ehci);
>  		}
> +		if (pdev->subsystem_vendor == PCI_VENDOR_ID_ASUSTEK) {
> +			/* EHCI #1 or #2 on 6 Series/C200 Series chipset */
> +			if (pdev->device == 0x1c26 || pdev->device == 0x1c2d) {
> +				ehci_info(ehci, "broken D3 during system sleep on ASUS\n");
> +				hcd->broken_pci_sleep = 1;
> +				device_set_wakeup_capable(&pdev->dev, false);
> +			}
> +		}
>  		break;
>  	case PCI_VENDOR_ID_TDI:
>  		if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
> --- linux.orig/include/linux/usb/hcd.h
> +++ linux/include/linux/usb/hcd.h
> @@ -128,6 +128,8 @@
>  	unsigned		wireless:1;	/* Wireless USB HCD */
>  	unsigned		authorized_default:1;
>  	unsigned		has_tt:1;	/* Integrated TT in root hub */
> +	unsigned		broken_pci_sleep:1;	/* Don't put the
> +			controller in PCI-D3 for system sleep */
>  
>  	int			irq;		/* irq allocated */
>  	void __iomem		*regs;		/* device memory/io */
> 
> 


-- 
Regards,
Oleksij
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