On Wed, Mar 04, 2015 at 12:27:34PM +0000, Dave Martin wrote:

Getting the TX IRQ re-asserted from scratch can be inefficient in
some setups.

This patch avoids clearing the TX IRQ across pl011_shutdown()...
pl011_startup(), so that if the port is closed and reopened, the
IRQ will still work afterwards without having to bootstrap it again.

So if a port is being used as the console, we end up spraying the system
with transmit interrupts?  This can't be right.

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