SK-AM62-LP: Multi-screen display combination

Hello,

On the product page, I see the following disclaimer: This LCD can support Raspberry Pi OS / Ubuntu / Kali / Retropie systems. When the LCD works on systems such as Raspberry Pi OS, the resolution must be set manually, otherwise, it will cause an abnormal display.

You will probably need to set resolution/edid manually. I personally have not tried it but here are some references to follow:

https://www.marcusfolkesson.se/blog/custom-edid-in-linux/

 https://bbs.archlinux.org/viewtopic.php?id=283456

Regards,
Krunal

Hi Krunal Bhargav34

Thank you for your discussion and suggestions.

I have considered whether it is an EDID issue, so I conducted cross-testing with a regular display. My understanding is that EDID communicates and establishes a value during HDMI detection.

Regarding this issue, the experiment was mainly conducted for multi-monitor testing. I used a more common Raspberry Pi module for the experiment.

I should clarify that this was just to set up a basic multi-screen display experimental testing environment, and ultimately, I will not be using the Raspberry Pi module.

The use of a regular HDMI display is normal, and I don't believe there is an issue with TI SOC HDMI compatibility. Let's discuss a couple of issues related to the 7-inch HDMI LCD with a resolution of 1024×600.

1. Is there a minimum resolution limit for the SOC HDMI (perhaps this is the issue)?

2. I checked the linux-ti-staging/drivers/gpu/drm/tilcdc file and found the following line:
#define TILCDC_DEFAULT_MAX_BANDWIDTH (1280*1024*60)

linux-ti-staging/drivers/gpu/drm/tilcdc

It does not mention support for 1024x600.

Regarding the above issues, is there a minimum resolution support limit?

Hello,

1. No, there is no minimum resolution limit and the SoC can supply max pixel clock of 165MHz. Also, keep in mind that we do not natively support HDMI. There is a SIL9022A bridge and I am not sure if that works fluently with resolution such as 1024x600.

2. TILCDC is for AM335x and if you are using AM62x, it's TIDSS.

Regards,
Krunal

Hi Krunal Bhargav34

Thank you for addressing my inquiry in a professional manner. I have read relevant information regarding the SIL9022A bridge

SiI9022A/SiI9024A HDMI Transmitter (lcsc.com)

www.ti.com/.../spruj51

I have a question regarding the possibilities of design combinations:

1. LVDS dual link + HDMI

This is the current basic combination for dual-screen setup.

2. LVDS0 + LVDS1 + HDMI

Is there a possibility for a three-screen setup with this combination?

3. About the SIL9022A bridge

The main function is to convert LCD data to HDMI output. In this design, is it possible to modify it for use with a general LCD panel?