[Bug 210321] /display/dc/dcn20/dcn20_resource.c:3240 dcn20_validate_bandwidth_fp+0x8b/0xd0 [amdgpu]

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=210321

--- Comment #5 from Tristen Hayfield (tristen.hayfield@gmail.com) ---
I did some more digging into this. I put some logging inside the if block to
see if that branch is ever taken:

        if (voltage_supported && dummy_pstate_supported) {
                context->bw_ctx.bw.dcn.clk.p_state_change_support = false;
                goto restore_dml_state;
        }

in order to log when or if the fallback worked. The logs confirmed that the
fallback is often used and generally works. Upon starting up the system and
starting up Xorg I get about a dozen log messages indicating that it entered
the if block. The only exception seems to be as Florian describes above, that
when the display shuts off due to power-saving it triggers the assertion.

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