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"*ERROR* Failed to probe lspcon" when HDMI isn't plugged before boot

Submitted by Kai-Heng Feng

Assigned to Swati2 Sharma @swati2.sharma

Link to original bug (#109112)

Description

Kernel vision: drm-intel-nightly, cod/tip/drm-tip/2018-12-19.

When booting the system without HDMI cable plugged, the system can never detect HDMI cable afterward.

This issue is not observed when HDMI cable is plugged before boot, LSPCON gets probed successfully in this case. HDMI hotplug also works in this case.

I tried to increase both retry count and sleep time in lspcon_probe(), but it doesn't make any difference.

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