AM5729: basic qt application cpu load 100% issue

Lee Seung-Geun

Part Number: AM5729

I ran a basic qt application with the eglfs platform, 
but there is a CPU load 100% issue. 
What's the reason?

1. environment

- am5729 cpu (dual core)

- tisdk-06.03.00.106

- embedded linux

- eglfs platform

2. helloqt qml source

Window {
  id: window
  visible: true
  width: 1920
  height: 720
  title: qsTr("Hello Qt")
  color: "black"
  visibility: Window.FullScreen

Rectangle {
id: button
property bool lighten: true

  width: 200
  height: 80
  color: lighten ? "red" : "green"
  radius: 5
  anchors.centerIn: parent

Text {
  id: buttonText
  text: qsTr("Hello Qt")
  color: button.lighten ? "white" : "black"
  anchors.centerIn: parent
  font.pixelSize: 40
font.family: "NanumGothicExtraBold"
}

MouseArea {
anchors.fill: parent
onClicked: parent.lighten = !parent.lighten
}
}
}

3. cpu load 100%

4. board env

/ # env
TSLIB_TSDEVICE=/dev/input/touchscreen0
SHLVL=2
HOME=/
SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
QT_QPA_EGLFS_ALWAYS_SET_MODE=1
QT_WAYLAND_SHELL_INTEGRATION=wl-shell
TERM=linux
QT_QPA_EGLFS_INTEGRATION=eglfs_kms
TSLIB_CONFFILE=/etc/ts.conf
QT_QPA_GENERIC_PLUGINS=tslib
QT_QPA_EGLFS_KMS_CONFIG=/etc/qt5/eglfs_kms_cfg.json
PWD=/
QT_QPA_PLATFORM=eglfs
TSLIB_CALIBFILE=/etc/pointercal

5. qtbase config.opt

Command line: -v -opensource -confirm-license

-no-use-gold-linker
-shared
-silent
-no-pch
-no-rpath
-pkg-config
-accessibility
-no-cups
-dbus
-no-directfb
-no-eglfs
-evdev
-make examples
-compile-examples
-fontconfig
-system-freetype
-gbm
-no-feature-getentropy
-gif
-opengl es2
-no-glib
-no-gtk
-qt-harfbuzz
-no-ico
-no-iconv
-icu
-no-journald
-system-libjpeg
-kms
-libinput
-system-libpng
-no-libproxy
-make libs
-linuxfb
-no-mtdev
-openssl
-qt-pcre
-release
-no-sm
-no-sql-db2
-no-sql-ibase
-no-sql-mysql
-no-sql-oci
-no-sql-odbc
-no-sql-psql
-no-sql-sqlite
-no-sql-sqlite2
-no-sql-tds
-shared
-make tests
-make tools
-tslib
-libudev
-widgets
-no-xcb
-no-xinput2
-no-xkb
-no-xkbcommon
-xkbcommon-evdev
-system-zlib
-eglfs
-qpa eglfs

Please Help me.

Best regards.

over 3 years ago

0 Lee Seung-Geun over 3 years ago

Prodigy 20 points

After removing 0001-eglfs_kms-enhance-the-QPA-for-multiple-display-and-u.patch,

CPU LOAD is about 1-2%.

But I need the above patch

because I will implement a camera viewer through multi-layer.

Can you fix the error(?) for the above patch?

Please Help me.

Best regards.

0 Takuma Fujiwara over 3 years ago in reply to Lee Seung-Geun

TI__Guru 51913 points

Hi Lee,

I have been checking internally on this patch, but it seems like there is some history behind this particular patch. This patch had been removed in the SDK for Sitara devices (which also uses the same underlying Linux distro).

As the removal of the patch was 3 years ago and the engineers tagged in the ticket I have found have left TI, I will need some more time to locate an engineer that can comment on this issue. At the latest, please expect a response back from me a week later.

Regards,

Takuma

0 Takuma Fujiwara over 3 years ago in reply to Takuma Fujiwara

TI__Guru 51913 points

For clarification, do you need this patch because you are wanting to connect multiple displays? Or it is one display that has multiple images layered on top of each other (like a section for text overlay, layering an image of a car on top of a camera feed, etc).

Regards,

Takuma

0 Lee Seung-Geun over 3 years ago in reply to Takuma Fujiwara

Prodigy 20 points

Hi Takuma Fujiwara,

What our products are trying to make are:

1. We don't need multi-display.
2. We need multi-layers.
3. We need a layer to view the 4 channel camera and a GUI layer.

We used the Video Graphics Test sample code mentioned in the following link.

https://software-dl.ti.com/processor-sdk-linux/esd/docs/06_03_00_106/linux/Examples_and_Demos/Application_Demos/Video_Graphics_Test.html

It has the following form:

Best regards.

0 Takuma Fujiwara over 3 years ago in reply to Lee Seung-Geun

TI__Guru 51913 points

Hi Lee,

To update you on the issue, I have located an engineer that can comment on this issue, but they are have been out on vacation and will come back the end of this week.

After they come back from vacation, I can update this thread on the status of this patch, so please expect a response beginning of next week.

Regards,

Takuma

0 Takuma Fujiwara over 3 years ago in reply to Takuma Fujiwara

TI__Guru 51913 points

Hi Lee,

Apologies for the delay and I am afraid to say I will need more time for this issue. I have consulted the engineer, but the response was that all the engineers that have worked on this patch has left the development team.

To set expectations, this is going to take a significantly longer time as the patch is a very large patch, and again, the engineers that have worked on this patch is no longer in development. I will continue to try to pull in time/resource to pull in, and will update the thread next week at the latest.

Sorry for the inconvenience, and thank you for your patience.

Regards,

Takuma

0 Takuma Fujiwara over 3 years ago in reply to Takuma Fujiwara

TI__Guru 51913 points

Hi Lee,

One thing the engineer I consulted mentioned is that the patch was working on SDK 5.3. If possible, could you try running the QT application using SDK 5.3?

Regards,

Takuma

0 Takuma Fujiwara over 3 years ago in reply to Takuma Fujiwara

TI__Guru 51913 points

Hi Lee,

I was able to have a discussion about the patch with the developer that made the patch.

Unfortunately, the patch has been deprecated and there are no plans from TI to maintain the patch. If the features that are needed in the patch is required, customers will need to resolve any issues on their end.

The only suggestion I can provide from the original developer is that the issue could be interrupt or there could be some part of the application waiting and polling for frames. I can also provide documentation for what the patch should allow that I can link as well: https://software-dl.ti.com/processor-sdk-linux/esd/AM57X/08_02_01_00/exports/docs/linux/Examples_and_Demos/Application_Demos/Video_Graphics_Test.html?highlight=video%20graphics

I have suggested previously, but you can also see if you can move to an older version of the SDK - although, the risk would be that there may be fixes for other parts of the SDK that your application needs between previous and current version of the SDK

Apologies for the inconvenience.

Regards,

Takuma

Processors

Processors forum

AM5729: basic qt application cpu load 100% issue