Hi Daniel, On 05/13/2014 06:08 PM, Daniel Thompson wrote:
On my test platform (B2020/STiH416) the serial port issues bad characters during the initial message avalanche as the console comes up. The problem also occurs when dense(ish) I/O is done using the polled I/O interface. The problem is fixed for me by using the FIFO half-empty bit rather than FIFO full bit. Note that using the half-empty bit causes the FIFO to be managed in a similar way to interrupt based I/O (i.e. where the hardware gets best test coverage). Running the FIFO half full will have no impact (good or bad) on console performance. The UART will still remain fully saturated and the busy-wait until the FIFO is empty in asc_console_write() will complete at the same time. Signed-off-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx> --- drivers/tty/serial/st-asc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
Acked-by: Maxime Coquelin <maxime.coquelin@xxxxxx> Thanks! Maxime -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
