On 2013/3/29 3:38, Alan Stern wrote:
On Fri, 29 Mar 2013, Lan Tianyu wrote:
Ok. I just refresh patch "usb: introduce usb force power off mechanism"
Please have a look.
From 16f5c7c6dd00830530a9ac758af25b575e0b8731 Mon Sep 17 00:00:00 2001
From: Lan Tianyu <tianyu.lan@xxxxxxxxx>
Date: Tue, 26 Feb 2013 11:12:09 +0800
Subject: [PATCH] usb: introduce usb force power off mechanism
Some devices' firmware will be broken at some points. Power down
and power on device can help device to rework in this case.
This patch is to add ioctl cmd USBDEVFS_POWER_RESET for usbfs node
to repower usb device. First, call hub_port_logical_disconnect() to
disconnect device. Second, Power down and up usb port.
This patch is also helpful fo some QAs who want to do hcd's memleak
test(Plug and unplug device thousand times.)
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
...
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -185,6 +185,8 @@ extern void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
enum usb_port_connect_type type);
extern void usb_hub_adjust_deviceremovable(struct usb_device *hdev,
struct usb_hub_descriptor *desc);
+extern int usb_hub_port_power_reset(struct usb_device *hdev,
+ int port1);
This can all go on one line.
It looks okay. When you test it, does the attached device get detected
and initialized properly?
I test usb2.0 key on my machine. It works.
Alan Stern
--
Best Regards
Tianyu Lan
linux kernel enabling team
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