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kms/impl-device: Inhibit deadline timer on vc4 (Raspberry Pi)

Daniel van Vugt requested to merge vanvugt/mutter:vc4-disable-deadline into main

vc4's implementation of drmModeAtomicCommit seems to require a few milliseconds advanced notice or else it will miss the frame deadline. That's too high for our deadline evasion threshold which is measured in microseconds. Let's stop trying to use deadline timers on vc4 to avoid this conflict without having to disable atomic KMS.

Suggested-by: Jonas Ådahl jadahl@gmail.com
Closes: #2953 (closed)

Edited by Daniel van Vugt

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