[Bug 110674] Crashes / Resets From AMDGPU / Radeon VII

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110674

--- Comment #87 from Tom B <tom at r.je> ---
> Could be we've got a race condition between the powerplay setup and amdgpu
handing off the card to drm_dev_register to advertise it for normal use.

The question then becomes: Why doesn't the race condition happen with only one
screen? Perhaps it's a matter of speed. With a single display, the driver
detect the displays, read/parse the EDID data, initialize in time. But then
that doesn't explain why the crash still occurs if you boot with one
DisplayPort monitor and attach another after X is running.

One thing I've been trying to work out is the difference between vega21_ppt.c
and   vega20_hwmgr.c is, as they both contain slightly different or identical
versions of the same functions. It looks like the functions in vega20_hwmgr.c 
take precedence but it's strange to see this duplication and both files are
worked on in the commit history.

Take a look at vega20_set_uclk_to_highest_dpm_level and
vega20_apply_clocks_adjust_rules in both for examples.

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