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/openbmc/linux/drivers/tty/serial/8250/ |
H A D | 8250_core.c | 2797f6fb Thu Sep 05 09:34:52 CDT 2013 Heikki Krogerus <heikki.krogerus@linux.intel.com> serial: 8250: don't change the fifo trigger level when using dma
DMA engines usually expect the fifo trigger level to be aligned with the burst size. It should not be changed even with small baud rates. This will fix an issue with Designware DMA engine where the data can not be transferred over UART with lower baud rates then 2400.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2797f6fb Thu Sep 05 09:34:52 CDT 2013 Heikki Krogerus <heikki.krogerus@linux.intel.com> serial: 8250: don't change the fifo trigger level when using dma DMA engines usually expect the fifo trigger level to be aligned with the burst size. It should not be changed even with small baud rates. This will fix an issue with Designware DMA engine where the data can not be transferred over UART with lower baud rates then 2400. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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