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authorLibin Yang <libin.yang@amd.com>2009-11-04 09:55:18 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-11-18 03:46:33 +0300
commita1f17a872bc7b1cb7efdd5486a2963e88a536e61 (patch)
treebfade484195ed46294ff0fbaa5e938fd052b1a47 /drivers/usb/host/ohci-q.c
parentac50e950784cae1c26ad9e09ebd8f8c706131eb3 (diff)
downloadlinux-a1f17a872bc7b1cb7efdd5486a2963e88a536e61.tar.xz
USB: ohci: quirk AMD prefetch for USB 1.1 ISO transfer
The following patch in the driver is required to avoid USB 1.1 device failures that may occur due to requests from USB OHCI controllers may be overwritten if the latency for any pending request by the USB controller is very long (in the range of milliseconds). Signed-off-by: Libin Yang <libin.yang@amd.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ohci-q.c')
-rw-r--r--drivers/usb/host/ohci-q.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index 16fecb8ecc39..35288bcae0db 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -49,9 +49,12 @@ __acquires(ohci->lock)
switch (usb_pipetype (urb->pipe)) {
case PIPE_ISOCHRONOUS:
ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs--;
- if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0
- && quirk_amdiso(ohci))
- quirk_amd_pll(1);
+ if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0) {
+ if (quirk_amdiso(ohci))
+ quirk_amd_pll(1);
+ if (quirk_amdprefetch(ohci))
+ sb800_prefetch(ohci, 0);
+ }
break;
case PIPE_INTERRUPT:
ohci_to_hcd(ohci)->self.bandwidth_int_reqs--;
@@ -680,9 +683,12 @@ static void td_submit_urb (
data + urb->iso_frame_desc [cnt].offset,
urb->iso_frame_desc [cnt].length, urb, cnt);
}
- if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0
- && quirk_amdiso(ohci))
- quirk_amd_pll(0);
+ if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0) {
+ if (quirk_amdiso(ohci))
+ quirk_amd_pll(0);
+ if (quirk_amdprefetch(ohci))
+ sb800_prefetch(ohci, 1);
+ }
periodic = ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs++ == 0
&& ohci_to_hcd(ohci)->self.bandwidth_int_reqs == 0;
break;