path: root/include
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authorAlan Stern <stern@rowland.harvard.edu>2015-12-10 15:27:21 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-12-11 15:40:51 -0800
commitad87e03213b552a5c33d5e1e7a19a73768397010 (patch)
treeabe42750b32a52d20a35bbd5635279a06d12390c /include
parentf69115fdbc1ac0718e7d19ad3caa3da2ecfe1c96 (diff)
USB: add quirk for devices with broken LPM
Some USB device / host controller combinations seem to have problems with Link Power Management. For example, Steinar found that his xHCI controller wouldn't handle bandwidth calculations correctly for two video cards simultaneously when LPM was enabled, even though the bus had plenty of bandwidth available. This patch introduces a new quirk flag for devices that should remain disabled for LPM, and creates quirk entries for Steinar's devices. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: Steinar H. Gunderson <sgunderson@bigfoot.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h
index 9948c874e3f1..1d0043dc34e4 100644
--- a/include/linux/usb/quirks.h
+++ b/include/linux/usb/quirks.h
@@ -47,4 +47,7 @@
/* device generates spurious wakeup, ignore remote wakeup capability */
+/* device can't handle Link Power Management */
+#define USB_QUIRK_NO_LPM BIT(10)
#endif /* __LINUX_USB_QUIRKS_H */