This is a note to let you know that I've just added the patch titled
Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-usbtouchscreen-avoid-unresponsive-tsc-30-touch-screen.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.
From 968491709e5b1aaf429428814fff3d932fa90b60 Mon Sep 17 00:00:00 2001
From: Bernhard Bender <redacted>
Date: Thu, 23 Jul 2015 13:58:08 -0700
Subject: Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
From: Bernhard Bender <redacted>
commit 968491709e5b1aaf429428814fff3d932fa90b60 upstream.
This patch fixes a problem in the usbtouchscreen driver for DMC TSC-30
touch screen. Due to a missing delay between the RESET and SET_RATE
commands, the touch screen may become unresponsive during system startup or
driver loading.
According to the DMC documentation, a delay is needed after the RESET
command to allow the chip to complete its internal initialization. As this
delay is not guaranteed, we had a system where the touch screen
occasionally did not send any touch data. There was no other indication of
the problem.
The patch fixes the problem by adding a 150ms delay between the RESET and
SET_RATE commands.
Suggested-by: Jakob Mustafa <redacted>
Signed-off-by: Bernhard Bender <redacted>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/input/touchscreen/usbtouchscreen.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -625,6 +625,9 @@ static int dmc_tsc10_init(struct usbtouc
goto err_out;
}
+ /* TSC-25 data sheet specifies a delay after the RESET command */
+ msleep(150);
+
/* set coordinate output rate */
buf[0] = buf[1] = 0xFF;
ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
Patches currently in stable-queue which might be from bernhard.bender@bytecmed.com are
queue-3.14/input-usbtouchscreen-avoid-unresponsive-tsc-30-touch-screen.patch