topic Re: Does the dual screen display based on the IMX8MQ chip support dual interface display of QT softw in i.MX Processors

Does the dual screen display based on the IMX8MQ chip support dual interface display of QT software?

ximenbingmeng — Mon, 17 Jun 2024 03:17:28 GMT

Hello,

we can see from the reference manual that the block diagram for achieving "dual screen display" is as follows,

And I saw the following explanation,

So if QT is in a "flow" mode, wouldn't displaying two QT interfaces work? If feasible, are there any reference examples? The kernel version we are using is 5.10.72.
Looking forward to your reply, thank you very much!

Re: Does the dual screen display based on the IMX8MQ chip support dual interface display of QT softw

gary_bisson — Mon, 17 Jun 2024 08:18:17 GMT

Hi,

As far as I know it isn't possible as the i.MX 8MQ exposes 2 different DRM/KMS devices for each output, 1DCSS & 1LCDIF.

All Qt examples show multiple displays examples using 1 and only 1 DRM device:

https://doc.qt.io/qt-6/embedded-linux.html#active-outputs-and-qscreen-instances

That would work on the i.MX 8MP as it exposes 1 DRM/KMS device with several connectors/outputs (HDMI, LVDS, MIPI-DSI).

Regards

Re: Does the dual screen display based on the IMX8MQ chip support dual interface display of QT softw

ximenbingmeng — Tue, 18 Jun 2024 00:55:51 GMT

Can IMX8MQ's DCSS connect multiple outputs? For example, connecting HDMI and MIPI-DSI? Can this achieve multi screen display?

Re: Does the dual screen display based on the IMX8MQ chip support dual interface display of QT softw

gary_bisson — Wed, 19 Jun 2024 12:27:09 GMT

No the DCSS can only connect to 1 output at a time.