On 06/17/2014 02:48 PM, Laurent Vivier wrote:
Hi,
I'm not subscribed to these mailing lists, so CC: me.
I'm playing for some days with a kernel 3.15 on an old mac performa 575
and it seems that the serial port is broken. When I log on using the
console on the serial port it seems there is an screen refresh added
after each character I send.
What uart driver is this happening on?
This is a known bug being worked on for these uart drivers:
sunsab
sunzilog
ip22zilog
pmac_zilog
Regards,
Peter Hurley
A little demo :
http://asciinema.org/a/10211 [at 3:20]
I bisect and I found this commit :
commit 717f3bbab3c7628736ef738fdbf3d9a28578c26c
Author: Seth Bollinger <[email protected]>
Date: Tue Mar 25 12:55:37 2014 -0500
serial_core: Fix conditional start_tx on ring buffer not empty
If the serial_core ring buffer empties just as the tty layer receives
an XOFF, then start_tx will never be called when the tty layer
receives an XON as the serial_core ring buffer is empty. This will
possibly leave a few bytes trapped in the fifo for drivers that
disable the transmitter when flow controlled.
Signed-off-by: Seth Bollinger <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
If I revert it, all works fine :
http://asciinema.org/a/10212
Regards,
Laurent
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