Created attachment 141517 [details]
GKL fails HDMI 2.0 compliance test HF1-23 E-DDC protocol- Read request- Clock stretching.
Created attachment 141518 [details]
Please try to reproduce the error using drm-tip (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e log_buf_len=4M, and if the problem persists attach the full dmesg from boot.
The SOC DDC controller does support clock stretching. My QD980B does not have the required test package to test HF1-23. Can another team reproduce this issue?
Created attachment 142073 [details]
HF1-23 results with latest QD980B firmware
Latest version of QD980B firmware has a fix for a known issue with the HF1-23 compliance test. Using FW version 5.01.06_23474_201808100859 results in passing results as seen in attachment.
Update QD980B to Version 5.01.06_23474_201808100859 FW or later