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During modesetting, we need to wait for the hardware to report readiness by polling the registers. Normally, we call msleep() between reads, because some state changes may take a whole vblank or more to complete. However during a panic, we are in an atomic context and cannot sleep. Instead, busy spin polling the termination condition. References: https://bugzilla.kernel.org/show_bug.cgi?id=31772 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Keith Packard <keithp@keithp.com> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> |
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