3.16.57-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Danilo Krummrich <danilokrummr...@dk-develop.de>
commit cb88a0588717ba6c756cb5972d75766b273a6817 upstream.
Corsair Strafe RGB keyboard does not respond to usb control messages
sometimes and hence generates timeouts.
Commit de3af5bf259d ("usb: quirks: add delay init quirk for Corsair
Strafe RGB keyboard") tried to fix those timeouts by adding
USB_QUIRK_DELAY_INIT.
Unfortunately, even with this quirk timeouts of usb_control_msg()
can still be seen, but with a lower frequency (approx. 1 out of 15):
[ 29.103520] usb 1-8: string descriptor 0 read error: -110
[ 34.363097] usb 1-8: can't set config #1, error -110
Adding further delays to different locations where usb control
messages are issued just moves the timeouts to other locations,
e.g.:
[ 35.400533] usbhid 1-8:1.0: can't add hid device: -110
[ 35.401014] usbhid: probe of 1-8:1.0 failed with error -110
The only way to reliably avoid those issues is having a pause after
each usb control message. In approx. 200 boot cycles no more timeouts
were seen.
Addionaly, keep USB_QUIRK_DELAY_INIT as it turned out to be necessary
to have the delay in hub_port_connect() after hub_port_init().
The overall boot time seems not to be influenced by these additional
delays, even on fast machines and lightweight distributions.
Fixes: de3af5bf259d ("usb: quirks: add delay init quirk for Corsair Strafe RGB
keyboard")
Signed-off-by: Danilo Krummrich <danilokrummr...@dk-develop.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
drivers/usb/core/message.c | 4 ++++
drivers/usb/core/quirks.c | 3 ++-
include/linux/usb/quirks.h | 3 +++
3 files changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -147,6 +147,10 @@ int usb_control_msg(struct usb_device *d
ret = usb_internal_control_msg(dev, pipe, dr, data, size, timeout);
+ /* Linger a bit, prior to the next control message. */
+ if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
+ msleep(200);
+
kfree(dr);
return ret;
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -226,7 +226,8 @@ static const struct usb_device_id usb_qu
{ USB_DEVICE(0x1b1c, 0x1b13), .driver_info = USB_QUIRK_DELAY_INIT },
/* Corsair Strafe RGB */
- { USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT },
+ { USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT |
+ USB_QUIRK_DELAY_CTRL_MSG },
/* Corsair K70 LUX */
{ USB_DEVICE(0x1b1c, 0x1b36), .driver_info = USB_QUIRK_DELAY_INIT },
--- a/include/linux/usb/quirks.h
+++ b/include/linux/usb/quirks.h
@@ -56,4 +56,7 @@
*/
#define USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL BIT(11)
+/* Device needs a pause after every control message. */
+#define USB_QUIRK_DELAY_CTRL_MSG BIT(13)
+
#endif /* __LINUX_USB_QUIRKS_H */
