[PATCH] usb: fix SB700 usb subsystem hang bug

[Andiry Xu]

This patch is required for AMD SB700 south bridge revision A12 and A13 to avoid
USB subsystem hang symptom. The USB subsystem hang symptom is observed when the
system has multiple USB devices connected to it. In some cases a USB hub may be
required to observe this symptom.

This patch works around the problem by correcting the internal register setting
that will help by changing the behavior of the internal logic to avoid the
USB subsystem hang issue. The change in the behavior of the logic does not
impact the normal operation of the USB subsystem.

Signed-off-by: Andiry Xu <andi...@amd.com>
Signed-off-by: Libin Yang <libin...@amd.com>

diff -ruN a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
--- a/drivers/usb/host/ehci-pci.c 2008-11-13 23:15:51.000000000 +0800
+++ b/drivers/usb/host/ehci-pci.c 2008-11-13 23:17:01.000000000 +0800
@@ -66,6 +66,8 @@
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+ struct pci_dev *p_smbus;
+ u8 rev;
u32 temp;
int retval;

@@ -166,6 +168,25 @@
pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
}
break;
+ case PCI_VENDOR_ID_ATI:
+ /* SB700 old version has a bug in EHCI controller,
+ * which causes usb devices lose response in some cases.
+ */
+ if (pdev->device == 0x4396) {
+ p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
+ PCI_DEVICE_ID_ATI_SBX00_SMBUS,
+ NULL);
+ if (!p_smbus)
+ break;
+ rev = p_smbus->revision;
+ if ((rev == 0x3a) || (rev == 0x3b)) {
+ u8 tmp;
+ pci_read_config_byte(pdev, 0x53, &tmp);
+ pci_write_config_byte(pdev, 0x53, tmp | (1<<3));
+ }
+ pci_dev_put(p_smbus);
+ }
+ break;
}

ehci_reset(ehci);

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[Greg KH]

On Fri, Nov 14, 2008 at 11:18:28AM +0800, Andiry Xu wrote:
> This patch is required for AMD SB700 south bridge revision A12 and A13 to avoid
> USB subsystem hang symptom. The USB subsystem hang symptom is observed when the
> system has multiple USB devices connected to it. In some cases a USB hub may be
> required to observe this symptom.
>
> This patch works around the problem by correcting the internal register setting
> that will help by changing the behavior of the internal logic to avoid the
> USB subsystem hang issue. The change in the behavior of the logic does not
> impact the normal operation of the USB subsystem.
>
> Signed-off-by: Andiry Xu <andi...@amd.com>
> Signed-off-by: Libin Yang <libin...@amd.com>

Care to add the "Reported-by:" and "Tested-by:" lines for the people who
helped bring this to your attention and resend it?

thanks,

greg k-h

[Andiry Xu]

This patch is required for AMD SB700 south bridge revision A12 and A13 to avoid
USB subsystem hang symptom. The USB subsystem hang symptom is observed when the
system has multiple USB devices connected to it. In some cases a USB hub may be
required to observe this symptom.

This patch works around the problem by correcting the internal register setting
that will help by changing the behavior of the internal logic to avoid the
USB subsystem hang issue. The change in the behavior of the logic does not
impact the normal operation of the USB subsystem.

Signed-off-by: Andiry Xu <andi...@amd.com>
Signed-off-by: Libin Yang <libin...@amd.com>

Reported-by: Volker Armin Hemmann <volker.arm...@tu-clausthal.de>
Tested-by: Volker Armin Hemmann <volker.arm...@tu-clausthal.de>