Original question:
Hi expert,
Hardware platform:J721EXSOMG01EVM + J721EXCP01EVM
Software:ti-processor-sdk-linux-j7-evm-08_06_00_11
rootfs: tisdk-default-image-j7-evm.tar.xz
When using DP0 connect to a monitor, there is a problem "tidss 4a00000.dss: CRTC0 SYNC LOST: (irq 80)".
Please Help, Thanks!
Hi Takuma,
Thanks for your reply.
When changed mhdp phy to rate 2700, 'CRTC0 SYNC LOST' disappear, but the monitor didn't show any image, the log as below:
Can you tell what's wrong?
First time working with dss, is there any documents or classes or videos talking about tidss's details and how to config tidss with dts, what's the meaning of every one parameter within dts about dss\serdes etc.
Thanks a lot.
Best Regards!
Hi Xi,
It could be that there are other issues that have been fixed in newer SDK release. Could you move to 9.2 SDK release and see if the display gets detected?
As for documentation, for Linux in general, information about dts can be found under Documentation/devicetree/bindings. Specifically for display, they can be found under Documentation/devicetree/bindings/display/ti/ti,j721e-dss.yaml. You can search for other documentation by searching for files that reference the compatible field in dts. For example, the dp bridge information can be found if you search for ti,j721e-mhdp8546.
Regards,
Takuma
Hi Takuma,
I moved to ti-processor-sdk-linux-adas-j721e-evm-09_02_00_05 , create a SD card with prebuilt files, but form the kernel log there seems to have no tidss.
Did I use the wrong version of SDK ?
Thanks,Best Regard!
Hi,
The full logs are as follow:
I've tried edgeai 09.02 image with J721EXSOMG01EVM , it works fine.
Using the same edgeai 09.02 image with ourselves designed board, When connect the board with monitor, there is no image on the monitor.
Some logs as below when connect the board with monitor:
Using 25GHz oscilloscope capture the DP0 signal at C422 and C423, get nothing.
Please help to think out what maybe wrong that here is no signal at C422 and C423.
Thanks, Best Regards!
