serial: 8250_dw: proper support for UARTs without busy functionality

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If the DW_apb_uart is configured with UART_16550_COMPATIBLE
configuration parameter set, then the Busy Functionality is
not available. These UARTs will never generate the Busy
detect indication interrupt, and therefore don't need
handling for it.

This creates a small optimization for the DW_apb_uarts
configured without the busy functionality, but more
importantly, it removes the small but real risk of hitting
potential issues caused by busy functionality handling when
no busy functionality exist.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Heikki Krogerus 2015-09-21 14:17:29 +03:00 • committed by Greg Kroah-Hartman

parent 9e08fa50b2

commit c73942e22a

2 changed files with 15 additions and 1 deletions

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3

Documentation/devicetree/bindings/serial/snps-dw-apb-uart.txt

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13

drivers/tty/serial/8250/8250_dw.c

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