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kernel: Start the AOP firmware the way a fresh coprocessor is started - #134
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The AOP sensor coprocessor crashed at start in some boots of the iPad 6 (no rotation until the next boot). The driver sent the freshly loaded firmware a power request before it had said hello; it now waits for the hello, as Orchard's GPU and NVMe drivers do. All A9 and A10 boards with the AOP.
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The AOP driver cold-starts its firmware, then called apple_rtkit_wake(), which sends an IOP power request before the firmware's hello: the call for already-running firmware. Use apple_rtkit_boot() as nvme-apple and pvr_apple (T8010 GPU) do for a coprocessor they start themselves. Targets the iPad 6 AOP start crash (co-processor has crashed 1 ms after start, firmware did not boot: -62, roughly one boot in six). Untested on hardware.