lkml.org 
[lkml]   [2014]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] serial: st-asc: Fix data corruption during long console bursts
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@linaro.org>
> ---
> drivers/tty/serial/st-asc.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>

Acked-by: Maxime Coquelin <maxime.coquelin@st.com>

Thanks!
Maxime


\
 
 \ /
  Last update: 2014-05-13 19:01    [W:0.051 / U:0.540 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site