Comment # 87
on bug 110674
from Tom B
> 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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