From: Bernhard Bender <bernhard.bender@xxxxxxxxxxxx>
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.
Signed-off-by: Bernhard Bender <bernhard.bender@xxxxxxxxxxxx>
Suggested-by: Jakob Mustafa <jakob.mustafa@xxxxxxxxxxxx>
---
Bernhard Bender
Entwicklung
Bytec Medizintechnik GmbH
Hermann-Hollerith-Str. 11
52249 Eschweiler, Germany
Tel. +49 (2403) 7829-943
www.bytecmed.com
Handelsregister Aachen: HRB 11222
Ust-ID: DE 121732719
Geschäftsführer: Dipl.-Ing. Paul Willi Coenen
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
old mode 100644
new mode 100755
index a096633..4ebff01
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -625,6 +625,9 @@ static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
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),
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