[Bug 205915] AMDGPU: Screen flicker after resume from suspend

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205915

--- Comment #11 from Manuel Ullmann (labre at posteo.de) ---
Reverting 1ea8751bd28d1ec2b36a56ec6bc1ac28903d09b4 on HEAD, currently 5.5-rc7+,
seems to fix it. The revert should probably be limited to the 2 hunks in the
clock manager files to preserve the underflow avoidance:
-                       if (update_dppclk)
+                       // always update dtos unless clock is lowered and not
safe to lower
+                       if (new_clocks->dppclk_khz >=
dc->current_state->bw_ctx.bw.dcn.clk.dppclk_khz)

For the sake of comleteness:
Steps to reproduce:
1. Suspend with Navi and activated display core.
2. Resume.
3. Start glxgears.

Actual results:
Animation flickers. This happens on any OpenGL accelerated task, like Firefox
with hardware acceleration or similar.

Expected results:
Flicker-free rendering.

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