diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2017-03-20 11:11:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-23 10:13:21 +0300 |
| commit | 21a60f6e65181cad64fd66ccc8080d413721ba27 (patch) | |
| tree | d28050eba5889bbfff01052dd4a88223de7db4c4 /drivers/usb/host/ohci.h | |
| parent | d3d6ef1fb908b286a610fe063613e519bc50178b (diff) | |
| download | linux-21a60f6e65181cad64fd66ccc8080d413721ba27.tar.xz | |
ohci-pci: add qemu quirk
On a loaded virtualization host (dozen guests booting at the same time)
it may happen that the ohci controller emulation doesn't manage to do
timely frame processing, with the result that the io watchdog fires and
considers the controller being dead, even though it's only the emulation
being unusual slow due to the load peak.
So, add a quirk for qemu and don't use the watchdog in case we figure we
are running on emulated ohci. The virtual ohci controller masquerades
as apple ohci controller, but we can identify it by subsystem id.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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/ohci.h')
| -rw-r--r-- | drivers/usb/host/ohci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h index 382444c8b44c..12742d002d2d 100644 --- a/drivers/usb/host/ohci.h +++ b/drivers/usb/host/ohci.h @@ -418,6 +418,7 @@ struct ohci_hcd { #define OHCI_QUIRK_AMD_PLL 0x200 /* AMD PLL quirk*/ #define OHCI_QUIRK_AMD_PREFETCH 0x400 /* pre-fetch for ISO transfer */ #define OHCI_QUIRK_GLOBAL_SUSPEND 0x800 /* must suspend ports */ +#define OHCI_QUIRK_QEMU 0x1000 /* relax timing expectations */ // there are also chip quirks/bugs in init logic |