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USB: EHCI: work around bug in the Philips ISP1562 controller

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This patch (as1556) works around a bug in the Philips ISP1562 EHCI
controller.  Although the controller claims to support frame-list
lengths smaller than the default of 1024 for its periodic schedule, in
fact smaller values don't work.  A new quirk flag is added to indicate
when the bug is present, and if it is then the schedule size is left
at the default value.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2012-05-14 13:48:16 -04:00
committed by Greg Kroah-Hartman
parent 65b8e5cbdd
commit 1996e6c572
3 changed files with 9 additions and 1 deletions
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2
drivers/usb/host/ehci-hcd.c
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@@ -639,7 +639,7 @@ static int ehci_init(struct usb_hcd *hcd)
INIT_LIST_HEAD(&ehci->cached_itd_list);
INIT_LIST_HEAD(&ehci->cached_sitd_list);
if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
if (HCC_PGM_FRAMELISTLEN(hcc_params) && !ehci->sched_size_bug) {
/* periodic schedule size can be smaller than default */
switch (EHCI_TUNE_FLS) {
case 0: ehci->periodic_size = 1024; break;