From 23b42ce55598d9c4de8d55c7d6f0fbd4042c3c39 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 10 Dec 2015 15:27:21 -0500 Subject: 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 Reported-by: Steinar H. Gunderson Signed-off-by: Greg Kroah-Hartman [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques --- include/linux/usb/quirks.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 4a185a0f6242..8f4f2214652f 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -47,4 +47,7 @@ /* device can't handle device_qualifier descriptor requests */ #define USB_QUIRK_DEVICE_QUALIFIER 0x00000100 +/* device can't handle Link Power Management */ +#define USB_QUIRK_NO_LPM BIT(10) + #endif /* __LINUX_USB_QUIRKS_H */ -- cgit v1.2.3