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HDMI can't show up behind a USB-C dock station

Description:

Plug a HDMI behind Dell Universal Dock - UD22, the HDMI can't work.

configuration:

kernel version: 6.9.0-rc2 (git-d08184aa) CPU: Intel(R) N100 Dock station: Dell Universal Dock - UD22 HDMI monitor: Asus PA24A (not specific)

Solution:

Refer to https://patchwork.freedesktop.org/series/132685

Re-train the main link once HPD happens without link status

The diff between w/ and w/o retrain is attached. retrain-log-diff.html

Edited by Gareth Yu
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