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RX 590 screen goes dark after switching monitor to different input and back

Brief summary of the problem:

I have an RX 590 graphics adapter connected via displayport to my monitor. When I switch the monitor to a different input and then back, the display remains dark. The following appears in the dmesg output:

Jan  4 10:28:04 localhost vmunix: [drm:dce112_get_pix_clk_dividers [amdgpu]] *ERROR* dce112_get_pix_clk_dividers: Invalid parameters!!
Jan  4 10:28:04 localhost vmunix: [drm:dm_restore_drm_connector_state [amdgpu]] *ERROR* Restoring old state failed with -22

This happens with kernel 5.4.86 but not 5.4.85 and can be reproduced reliably.

I have narrowed it down to the following change:

    commit e1b1f10c3404c8d40c45c3a6846d304fd403fa2c
    Author: Stylon Wang <stylon.wang@amd.com>
    Date:   Tue Nov 10 15:40:06 2020 +0800

        drm/amd/display: Fix memory leaks in S3 resume
        
        commit a135a1b4c4db1f3b8cbed9676a40ede39feb3362 upstream.

Hardware description:

  • CPU: Intel i7 4790K
  • GPU: Radeon RX 590 (Gigabyte)
  • System Memory: 24GB
  • Display(s): HP 25x
  • Type of Diplay Connection:DP

System infomration:

  • Distro name and Version: N/A
  • Kernel version: 5.4.86
  • Custom kernel: built from main kernel.org kernel
  • AMD package version: No package

How to reproduce the issue:

< TODO: Describe step-by-step how to reproduce the issue > < NOTE: Add as much detail as possible >

  1. Boot 5.4.86 kernel, start X
  2. Switch display input to HDMI
  3. Switch display input back to DP

Screen remains dark.

Kernel log contains:

Jan  4 10:28:04 localhost vmunix: [drm:dce112_get_pix_clk_dividers [amdgpu]] *ERROR* dce112_get_pix_clk_dividers: Invalid parameters!!
Jan  4 10:28:04 localhost vmunix: [drm:dm_restore_drm_connector_state [amdgpu]] *ERROR* Restoring old state failed with -22

Attached files:

None, please see kernel log lines above