linux-kernel - [PATCH] usb: Increase quirk delay for USB devices

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Date:   Tue,  5 Sep 2017 11:40:56 +0300
From:   Dmitry Fleytman <dmitry@...nix.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Dmitry Fleytman <dmitry@...nix.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Samuel Thibault <samuel.thibault@...-lyon.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Johan Hovold <johan@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Eugene Korenevsky <ekorenevsky@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: Increase quirk delay for USB devices

Commit e0429362ab15
("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e")
introduced quirk to workaround an issue with some Logitech webcams.

The workaround is introducing delay for some USB operations.

According to our testing, delay introduced by original commit
is not long enough and in rare cases we still see issues described
by the aforementioned commit.

This patch increases delays introduced by original commit.
Having this patch applied we do not see those problems anymore.

Signed-off-by: Dmitry Fleytman <dmitry@...nix.com>
---
 drivers/usb/core/config.c | 2 +-
 drivers/usb/core/hub.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 4be52c6..854c8d6 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -852,7 +852,7 @@ int usb_get_configuration(struct usb_device *dev)
 		}
 
 		if (dev->quirks & USB_QUIRK_DELAY_INIT)
-			msleep(100);
+			msleep(200);
 
 		result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
 		    bigbuffer, length);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 822f8c5..78c2aca 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4825,7 +4825,7 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
 			goto loop;
 
 		if (udev->quirks & USB_QUIRK_DELAY_INIT)
-			msleep(1000);
+			msleep(2000);
 
 		/* consecutive bus-powered hubs aren't reliable; they can
 		 * violate the voltage drop budget.  if the new child has
-- 
2.7.4