linux-kernel - [PATCH] usb: gadget: composite: enable BESL support

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Message-ID: <0C18FE92A7765D4EB9EE5D38D86A563A01CDD6AE@SHSMSX103.ccr.corp.intel.com>
Date:	Tue, 28 Apr 2015 07:56:13 +0000
From:	"Du, Changbin" <changbin.du@...el.com>
To:	"stable@...r.kernel.org" <stable@...r.kernel.org>
CC:	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Cohen, David A" <david.a.cohen@...el.com>,
	"Wu, Hao" <hao.wu@...el.com>
Subject: [PATCH] usb: gadget: composite: enable BESL support

>From a6615937bcd9234e6d6bb817c3701fce44d0a84d Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi@...com>
Date: Tue, 30 Sep 2014 16:08:03 -0500
Subject: [PATCH] usb: gadget: composite: enable BESL support

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.

Cc: <stable@...r.kernel.org> # 3.14
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Du, Changbin <changbin.du@...el.com>
---
Hi,

This patch was introduced on v3.18. However the issue fixed already existed on
v3.14 and v3.14 is a long term support version.

So propose to backport it over there as well.

Du, Changbin
---
 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 a8c18df..f6a51fd 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
-- 
1.9.1

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