linux-kernel - [PATCH 3.16.y-ckt 042/180] usb: gadget: composite: enable BESL support

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Message-Id: <1430991989-23170-43-git-send-email-luis.henriques@canonical.com>
Date:	Thu,  7 May 2015 10:44:11 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Felipe Balbi <balbi@...com>,
	"Du, Changbin" <changbin.du@...el.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 042/180] usb: gadget: composite: enable BESL support

3.16.7-ckt11 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felipe Balbi <balbi@...com>

commit a6615937bcd9234e6d6bb817c3701fce44d0a84d upstream.

According to USB 2.0 ECN Errata for Link Power
Management (USB2-LPM-Errata-final.pdf), BESL
must be enabled if LPM is enabled.

This helps with USB30CV TD 9.21 LPM L1
Suspend Resume Test.

Signed-off-by: Felipe Balbi <balbi@...com>
Cc: Du, Changbin <changbin.du@...el.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/usb/gadget/composite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index f80151932053..9536b6abf65b 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -560,7 +560,7 @@ static int bos_desc(struct usb_composite_dev *cdev)
 	usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
 	usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
 	usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
-	usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT);
+	usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);
 
 	/*
 	 * The Superspeed USB Capability descriptor shall be implemented by all
--
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