On Fri, 3 Feb 2012 20:56:07 -0700 (MST) Paul Walmsley [off-list ref] wrote:

On Sat, 4 Feb 2012, NeilBrown wrote:

quoted

I have to set autosuspend_delay_ms for omap_uart.3 as well before the
behaviour is significant.
But then I see no output corruption.  Lots of input corruption of course but
the output looks fine.

OK.  Is the input corruption at the beginning of the pasted buffer, or the 
middle?  And this is with CPUIdle enabled?

With CPUIdle disabled here, what I thought was output corruption occurs in 
the middle of the pasted buffer occasionally.  But it might be input 
corruption, if the CPU manages to empty the RX FIFO while the TX FIFO is 
empty.


- Paul

Yes, cpu-idle is enabled.

I think corruption is mostly early, though it isn't very consistent.

e.g.

# C!jHhzys/Y?omap/omap_uart.2/power/autosuspend_delay_ms
-bash: !jHhzys/Y?omap/omap_uart.2/power/autosuspend_delay_ms: event not found
# echo 0 > /sys/devices/platFK/////mpWWt.]au%e_mHHHhQ 5
-bash: /sys/devices/platFK/////mpWWt.]au%e_mHHHhQ: No such file or directory


NeilBrown