Maybe I`ve found a nice old patch: https://github.com/Angstrom-distribution/meta-ti/blob/master/recipes-kernel/linux/linux-ti33x-psp-3.2/psp/0010-usb-musb-cppi41-enable-txfifo-empty-interrupt-logic.patch
Is "tx fifo empty interrupt" logic already used? So maybe for ISOC we can avoid the busy hrtimer loop. -- Sebastian Reimers
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