Display Port mhdp8546 dmesg storm

beagleboard / beaglebone-ai-64

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Display Port mhdp8546 dmesg storm #10

Closed RobertCNelson closed 9 months ago

RobertCNelson commented 3 years ago

[  519.896125] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.907369] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.915595] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.926264] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.934877] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.945132] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.954368] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0
[  519.964880] cdns-mhdp8546 a000000.dp-bridge: Failed to read DPCD addr 0

mingzhangqun commented 3 years ago

I think you should try a 1080p monitor. e4826346fa3890d947abd4bd178fadc https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/07_03_00_05/exports/docs/linux/How_to_Guides/Hardware_Setup_with_CCS/J721E_EVM_Hardware_Setup.html?highlight=1080p

RobertCNelson commented 3 years ago

and ti has a special build of this firmware too, which makes things fun:

https://git.ti.com/gitweb?p=processor-firmware/ti-linux-firmware.git;a=history;f=cadence/mhdp8546.bin;h=bbb1009a22ac01d6a28c09d8acd2ae73b820bb9f;hb=refs/tags/08.00.00.004

We are grabbing them from TI' SDK to stay in sync.. But mainline linux-firmware is different..

Eventually mainline "linux-firmware" must work..

Regards,

jadonk commented 3 years ago

@FionaYu20180326 lets stick with miniDP, but we need to find a list of what monitors work and which don't.

mingzhangqun commented 3 years ago

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/06_02_00_21/exports/docs/psdk_rtos_auto/docs/user_guide/evm_setup_j721e.html#evm-setup-for-j721e

jim255 commented 3 years ago

Ordered a miniDP to VGA cable ( less than $10 US ) to see if that works.

jim255 commented 3 years ago

https://www.amazon.com/BENFEI-DisplayPort-Display-Gold-Plated-Compatible/dp/B0823Q2W6N?ref_=ast_sto_dp&th=1 Finally arrived at 9:00PM last night.. I have a VGA monitor running. It has a few bugs, but it does work

jim255 commented 3 years ago

https://www.amazon.com/gp/product/B07BBFR1FJ/ also works as reported on Slack by Nishanth Menon

nmenon commented 3 years ago

https://www.amazon.com/gp/product/B07K36QBYX/ as well.

jim255 commented 2 years ago

In reviewing https://www.amazon.com/dp/B089GF8M87 or https://www.amazon.com/gp/product/B07BBFR1FJ/ mentioned previously.: The first monitor I tested supports all 9 given selections from 800 x 600 to 1920 x 1080. The second monitor had only 8 selections in the same range, tested each, works fine. An "Active" converter to an HDMI monitor, or a DP compatible monitor should be the recommended configuration.

nmenon commented 2 years ago

@jim255 what is ""Active" converter to an HDMI monitor" , any examples?

jim255 commented 2 years ago

HDMI and Display Port are high speed digital protocols, the driver can ask the monitor "What resolutions can you support?". Active adapters support this, passive adapters do not. The two devices listed in my previous post have been successfully tested on multiple devices. I honestly wish I had the budget to test every adapter I found on Amazon.

jadonk commented 2 years ago

https://www.startech.com/en-us/faq/displayport-converter-dp-multi-mode