linux-kernel - [PATCH] usb: Enable LPM for USB 2.01+ full-speed devices

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Date:	Wed, 25 Mar 2015 12:23:19 +0530
From:	rtatiya@...eaurora.org
To:	sarah.a.sharp@...ux.intel.com, linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Rupesh Tatiya <rtatiya@...eaurora.org>
Subject: [PATCH] usb: Enable LPM for USB 2.01+ full-speed devices

From: Rupesh Tatiya <rtatiya@...eaurora.org>

USB 2.01+ full-speed devices can have extended descriptor as well
and can support LPM.

Change-Id: Ic055d51c02651810d3eb7141bab20a090fe8453b
Signed-off-by: Rupesh Tatiya <rtatiya@...eaurora.org>
---
 drivers/usb/core/hub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 9ef2d2c..1ed7b5d 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -140,7 +140,7 @@ static int usb_device_supports_lpm(struct usb_device *udev)
 	/* USB 2.1 (and greater) devices indicate LPM support through
 	 * their USB 2.0 Extended Capabilities BOS descriptor.
 	 */
-	if (udev->speed == USB_SPEED_HIGH) {
+	if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) {
 		if (udev->bos->ext_cap &&
 			(USB_LPM_SUPPORT &
 			 le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, 
a Linux Foundation Collaborative Project

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