serial: 8250_mid: recognize interrupt source in handler

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There is a special register that shows interrupt status by source. In
particular case the source can be a combination of DMA Tx, DMA Rx, and UART.

Read the register and call the handlers only for sources that request an
interrupt.

Fixes: 6ede6dcd87 ("serial: 8250_mid: add support for DMA engine handling from UART MMIO")
Cc: stable@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Andy Shevchenko 2016-04-04 17:35:10 +03:00 • committed by Greg Kroah-Hartman

parent 107e15fc1f

commit c42850f1ae

1 changed files with 11 additions and 10 deletions

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drivers/tty/serial/8250/8250_mid.c

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