diff options
| author | Bernhard Bender <bernhard.bender@bytecmed.com> | 2015-07-23 13:58:08 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-07-23 14:43:17 -0700 |
| commit | 968491709e5b1aaf429428814fff3d932fa90b60 (patch) | |
| tree | 370200624d8cbde19c03e053fa0dcac8370db16d /mm/cma.c | |
| parent | d98399e688f8c4f42f4270c2dfe1293f69247c5b (diff) | |
Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
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.
Cc: stable@vger.kernel.org
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>
Diffstat (limited to 'mm/cma.c')
0 files changed, 0 insertions, 0 deletions