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authorAlan Stern <stern@rowland.harvard.edu>2015-12-10 15:27:21 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-01-22 20:54:10 -0800
commit04db25a46b25ac5c29082a61f96067c8cd5984ad (patch)
treee4ec2bc35533c78ad9204ae79798945a6b2654aa /include
parentee10f5fe09105cc5495f00156f9a7914bbfa1c32 (diff)
downloadlwn-04db25a46b25ac5c29082a61f96067c8cd5984ad.tar.gz
lwn-04db25a46b25ac5c29082a61f96067c8cd5984ad.zip
USB: add quirk for devices with broken LPM
commit ad87e03213b552a5c33d5e1e7a19a73768397010 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/usb/quirks.h3
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 */
#define USB_QUIRK_IGNORE_REMOTE_WAKEUP BIT(9)
+/* device can't handle Link Power Management */
+#define USB_QUIRK_NO_LPM BIT(10)
+
#endif /* __LINUX_USB_QUIRKS_H */