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KMS: 4096x2160p60 causes hang/unresponsive pi unless overclocked #5034

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@alanbork

Description

@alanbork

Describe the bug

as of 1c56b3a58974f725e1ac63214eeaf914c5908302, I still get hangs/blank screens if I try to use 4096x2160p60 unless I overclock the cpu via config.txt (core_freq=600 core_freq_min=600)

dmesg reports:

vc4-drm gpu: [drm] ERROR Timed out waiting for commit
[ 273.107442] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] ERROR [CRTC:94:crtc-3] flip_done timed out

If I understand correctly this should be fixed by #4940.

Steps to reproduce the behaviour

reproducible using kms and modetest at the console (no x). Have not tried X but I see no reason to think it will do better.

Device (s)

Raspberry Pi 4 Mod. B

System

System updated using rpi-update to 1c56b3a58974f725e1ac63214eeaf914c5908302

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