HDMI audio does not work on Geminilake in certain circumstances

My setup is a bit different from the typical distribution and I think that triggers the problem.

This is on a Pentium Silver N5030 (DMI: ECS LIVA Q2/PB02CF, BIOS LIVAQ2.03 01/21/2022) with a single HDMI output.

What happens at boot time is this:

1. the i915 module is loaded. It reads the state from the hardware.

   Note, that at that point EDID is not read. I don't have fbdev emulation or an initramfs userspace that could trigger this. This is probably the main difference that triggers the issue.

2. the audio driver is loaded. This is a Geminilake CPU so it does a atomic commit in glk_force_audio_cdclk(enable=true)

3. now Weston starts. It causes EDID to be loaded and does its first atomic commit. It uses the same mode. And as far as I can tell, here is where the problem starts:

   In intel_atomic_check() old_crtc_state->inherited is now false for the only crtc. As a result, intel_crtc_needs_modeset() returns false and so intel_modeset_pipe_config() is not called.

The end result is, that audio is not enabled for the output. The dmesg for this with drm.debug=0x1e is attached drm-debug.txt.

I've done some more testing and noted a few things:

If I do a commit with a different mode then intel_modeset_pipe_config() is called and audio starts working.

If I wait longer after step 2. then runtime PM calls (indirectly) glk_force_audio_cdclk(enable=false). In this case I get this in the log:

[   21.344594] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, switching to polling mode: last cmd=0x20bf8100
[   22.374413] snd_hda_intel 0000:00:0e.0: No response from codec, disabling MSI: last cmd=0x20bf8100
[   23.404608] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, switching to single_cmd mode: last cmd=0x20bf8100
[   23.808907] snd_hda_codec_hdmi hdaudioC0D2: Unable to sync register 0x2f0d00. -5

At that point, audio is broken until I reboot.

As far as I can tell, all of this happens every single time. And I've tested this with 5.15.x and drm-tip from today (v5.17-rc7-1525-g3e6b6cad3c11).