On Thu, Jul 23, 2015 at 05:01:31PM +0200, Bernhard Bender wrote: > From: Bernhard Bender <[email protected]> > > 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 <[email protected]> > Suggested-by: Jakob Mustafa <[email protected]>
Applied, thank you. > > --- > 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), > > > > Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte > Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail > irrtümlich erhalten haben, informieren Sie bitte sofort den Absender unter > [email protected] und löschen Sie diese Mail. Das unerlaubte Kopieren sowie > die unbefugte Weitergabe dieser Mail ist nicht gestattet. > > This message may contain privileged and confidential information intended > only for the use of the addressee named above. If you are not the intended > recipient of this message you are hereby notified that any use, > dissemination, distribution of reproduction of this message is prohibited. If > you have received this message in error please notify [email protected] > immediately. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
