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>
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index 16fecb8..35288bc 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -49,9 +49,12 @@
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 @@
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;