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| author |   Alan Stern <stern@rowland.harvard.edu> | 2012-05-14 13:48:16 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-14 12:50:22 -0700 |
| commit | 1996e6c572969a8cf6d7fa97eef621219acd94a9 (patch) | |
| tree | 4a6bcdd32202438d6f8a4671a936319c0292dbf3 /drivers/usb/host/ehci-pci.c | |
| parent | USB: EHCI: improve full-speed isochronous scheduling routine (diff) | |
| download | linux-dev-1996e6c572969a8cf6d7fa97eef621219acd94a9.tar.xz linux-dev-1996e6c572969a8cf6d7fa97eef621219acd94a9.zip | |
USB: EHCI: work around bug in the Philips ISP1562 controller
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>
Diffstat (limited to 'drivers/usb/host/ehci-pci.c')
| -rw-r--r-- | drivers/usb/host/ehci-pci.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index bc94d7bf072d..4baafa3e80b2 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -97,6 +97,13 @@ static int ehci_pci_setup(struct usb_hcd *hcd) break; } break; + + case PCI_VENDOR_ID_PHILIPS: + /* + * Philips controllers set HCC_PGM_FRAMELISTLEN, but + * they don't implement schedule sizes shorter than 1024. + */ + ehci->sched_size_bug = 1; } /* cache this readonly data; minimize chip reads */ |