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| author | Bernhard Bender <bernhard.bender@bytecmed.com> | 2015-07-23 13:58:08 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-10 12:20:30 -0700 |
| commit | 15d6dd8f74b03fcdfbb66fa45f3c3dfdaccb3f75 (patch) | |
| tree | 21684a7e1ee5c1dbb7661afe0e549cf6d19f73cb /drivers/input/tablet | |
| parent | 9fbf45ec96502ed1f3d6498c142e7e18f0cec9b2 (diff) | |
Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
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 <jakob.mustafa@bytecmed.com>
Signed-off-by: Bernhard Bender <bernhard.bender@bytecmed.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/input/tablet')
0 files changed, 0 insertions, 0 deletions