[PATCH REPOST 2/2] serial/amba-pl011: Leave the TX IRQ alone when the UART is not open

Russell King - ARM Linux linux at arm.linux.org.uk
Thu Mar 12 04:04:41 PDT 2015

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.

FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

More information about the linux-arm-kernel mailing list