Need support to Set the primary Display on IMX8QM

PunitTeksun — Sun, 09 Apr 2023 11:18:59 GMT

Hello Support Portal,

SOC: IMX8QM

We have connected the Dual Channel display on the LDB2 node and the Single Channel display on the LDB1 node.

Dual Channel Display: 1920X720

Single Channel Display: 1280X800

The android is detecting both the display

Currently Android considers Single channel 1280X800 Display as a primary display and a Dual channel 1920X720 display as a secondary display.

What we want :

Dual channel display - primary

Single channel display - secondary

We have tried following things

1) First we connect the Dual channel display and then after some time we connect the single-channel display but still, the single-channel display is considered as a primary display

Note: If we disable the single-channel display node from the device tree then the dual-channel display is considered the primary display.

Re: Need support to Set the primary Display on IMX8QM

Zhiming_Liu — Mon, 10 Apr 2023 06:25:34 GMT

This order is decided by the LDB driver probe order. The LDB1 connector should be first and then LDB2 connector.

You can find the display hal code in nxp-opensource/imx/display/display/DisplayManager.cpp

The code will set the first connector as primary device(using setPrimaryDisplay), you can judge the value of *id to decide which device should be primary.

for (int i = 0; i < res->count_connectors; i++) { display = mKmsDisplays[*id]; if (display->setDrm(drmFd, res->connectors[i]) != 0) { continue; } display->setDisplayLimitation(tileHwLimit); display->readType(); display->readConnection(); // primary display allow not connected. if (!display->connected() && (*foundPrimary || !main)) { (*id)++; continue; } if (display->openKms() != 0) { display->closeKms(); (*id)++; continue; } // primary display is fixed by name. if (!*foundPrimary && main) { ALOGI("%s set %d as primary display", __func__, (*id)); *foundPrimary = true; setPrimaryDisplay(*id); }

topic Re: Need support to Set the primary Display on IMX8QM in i.MX Processors

Need support to Set the primary Display on IMX8QM

Re: Need support to Set the primary Display on IMX8QM