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authorAndiry Xu <andiry.xu@amd.com>2010-11-08 17:58:35 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-11-16 13:36:40 -0800
commit3d091a6f703906c5680855ff29bd94d051c8c6d8 (patch)
tree199509dfec473bd44e312862faf441b70eae952c /drivers/usb/host/ehci-pci.c
parent3d965875144b905d71dfb4d291c665c0794222c4 (diff)
downloadop-kernel-dev-3d091a6f703906c5680855ff29bd94d051c8c6d8.zip
op-kernel-dev-3d091a6f703906c5680855ff29bd94d051c8c6d8.tar.gz
USB: EHCI: AMD periodic frame list table quirk
On AMD SB700/SB800/Hudson-2/3 platforms, USB EHCI controller may read/write to memory space not allocated to USB controller if there is longer than normal latency on DMA read encountered. In this condition the exposure will be encountered only if the driver has following format of Periodic Frame List link pointer structure: For any idle periodic schedule, the Frame List link pointers that have the T-bit set to 1 intending to terminate the use of frame list link pointer as a physical memory pointer. Idle periodic schedule Frame List Link pointer shoule be in the following format to avoid the issue: Frame list link pointer should be always contains a valid pointer to a inactive QHead with T-bit set to 0. Signed-off-by: Andiry Xu <andiry.xu@amd.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-pci.c')
-rw-r--r--drivers/usb/host/ehci-pci.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index a1e8d27..01bb72b 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -103,6 +103,19 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
if (retval)
return retval;
+ if ((pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x7808) ||
+ (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x4396)) {
+ /* EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
+ * read/write memory space which does not belong to it when
+ * there is NULL pointer with T-bit set to 1 in the frame list
+ * table. To avoid the issue, the frame list link pointer
+ * should always contain a valid pointer to a inactive qh.
+ */
+ ehci->use_dummy_qh = 1;
+ ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI "
+ "dummy qh workaround\n");
+ }
+
/* data structure init */
retval = ehci_init(hcd);
if (retval)
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