iMX8QM Multiple displays

[pierluigi_p]

Dear NXP team,

from the imx8qm-mek.dts sample device tree, I can guess that 2 distinct displays can be driven simultaneously when linked to 2 different DPUs.

If I understand correctly the imx8qm-ss-dc.dtsi device tree, each DPU provides 2 ports and each port (but port0 of dpu2) provides 2 endpoints: totally I can see 7 endpoints.

Can all the 7 endpoints be used simultaneously?

More generally, for a specific port, can I use both the endpoints?

If not, can I simultaneously use 1 endpoint for each port (4 endpoints)?

Is there any reference documentation about the possible use of DPUs/ports/endpoints?

Thanks

Best Regards

Pier

[Zhiming_Liu]

Hi @pierluigi_p 

Display Controller Supports single UltraHD 4Kp60 display or up to 4 independent FullHD 1080p60
displays

Display I/O

2× MIPI-DSI with 4 lanes each
1× HDMI-TX/DisplayPort compliant with:
• HDMI
• eDP 1.4
• DP 1.3
This high performance serializer supports a pair of LVDS displays with 8 lanes each.
Each port can be configured for 2x Tx with 4 lanes each.

dpu1 and dpu2 are two different definitions. You can't use dpu2 when using dpu1.

So the max number of screen is 4 if you want to display 4 different contents.

The lvds0 ch0 and ch1 share same rgb data, you can use connect 2 display devices to lvds0. But they display same content.

Is there any reference documentation about the possible use of DPUs/ports/endpoints?

--->See i.mx8qm datasheet

[pierluigi_p]

Hi @Zhiming_Liu,

according the iMX8QM datasheet, I understand I can get 4 displays, one for each port, 2 from dpu1 and 2 from dpu2, is this correct?

How can I get 4 displays if I "can't use dpu2 when using dpu1" ?

Thanks

Best Regards

Pier