Qt-embedded touch screen can't work on IMX6 platform

Rock_Lee

Hi,

I build Yocto with QT as below:

        DISTRO=fsl-imx-fb MACHINE=imx6sllevk bitbake fsl-image-qt5-validation-imx

Burn this image in IMX6SLL board, and run below QT test app, but touch screen have no any response:

       root@imx6sllevk:~# /usr/share/examples/widgets/widgets/calculator/calculator

The QT env settings are:

      export QT_QPA_PLATFORM=linuxfb:fb=/dev/fb0
      export QTDIR=/usr/lib
      export QT_QPA_FONTDIR=$QTDIR/fonts
      export QT_QPA_PLATFORM_PLUGIN_PATH=$QTDIR/plugins/platforms

      export QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/event1
      export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event1

The touch event does work when touch in console command:

       root@(none):/# cat /dev/input/event1 | hexdump
          0000000 a265 4eff a510 0000 0001 0145 0001 0000
          0000010 a265 4eff a510 0000 0001 014a 0001 0000
          0000020 a265 4eff a510 0000 0003 0039 0000 0000

How can I debug this issue "why touch can't work in QT app" ?

When add QT debug message :

          export QT_LOGGING_RULES=qt.qpa.input=true

Have touch message show:

root@(none):/# /usr/share/examples/widgets/widgets/calculator/calculator
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
qt.qpa.input: evdevkeyboard: Using device discovery
qt.qpa.input: udev device discovery for type QFlags<QDeviceDiscovery::QDeviceType>(Device_Keyboard)
Failed to scan devices
qt.qpa.input: evdevmouse: Using device discovery
qt.qpa.input: udev device discovery for type QFlags<QDeviceDiscovery::QDeviceType>(Device_Mouse|Device_Touchpad)
Failed to scan devices
qt.qpa.input: evdevtouch: Adding device at /dev/input/event1
qt.qpa.input: evdevtouch: Adding device at /dev/input/event1
qt.qpa.input: evdevtouch: Using device /dev/input/event1
qt.qpa.input: evdevtouch: /dev/input/event1: Protocol type A  (multi), filtered=no
qt.qpa.input: evdevtouch: /dev/input/event1: min X: 0 max X: 1447
qt.qpa.input: evdevtouch: /dev/input/event1: min Y: 0 max Y: 1071
qt.qpa.input: evdevtouch: /dev/input/event1: min pressure: 0 max pressure: 0
qt.qpa.input: evdevtouch: /dev/input/event1: device name: cyttsp5_mt
qt.qpa.input: evdevtouch: Using device /dev/input/event1
qt.qpa.input: evdevtouch: /dev/input/event1: Protocol type A  (multi), filtered=no
qt.qpa.input: evdevtouch: /dev/input/event1: min X: 0 max X: 1447
qt.qpa.input: evdevtouch: /dev/input/event1: min Y: 0 max Y: 1071
qt.qpa.input: evdevtouch: /dev/input/event1: min pressure: 0 max pressure: 0
qt.qpa.input: evdevtouch: /dev/input/event1: device name: cyttsp5_mt
qt.qpa.input: evdevtouch: Updating QInputDeviceManager device count: 1 touch devices, 0 pending handler(s)
qt.qpa.input: evdevtouch: Updating QInputDeviceManager device count: 1 touch devices, 0 pending handler(s)