[PATCH 0/2] serial: pmac_zilog: two receive fixes

[Tim Douglas <me@timdoug.com>]

These two patches fix receive problems in pmac_zilog that I ran into
while bringing up the serial ports on a Performa 6200CD, a NuBus Power
Macintosh. The first stops data received on one port from being left in
its flip buffer while the other port is open. The second makes received
breaks visible; until now they arrived as plain NUL characters.

I tested both on the 6200, running 7.2.8 with an out-of-tree platform
port and a loopback plug on the printer port. Without the series, only 3
of 8 bytes written to ttyPZ1 came back while ttyPZ0 was open, and a
break sent with tcsendbreak() arrived as a NUL with no break counted.
With the series, all 8 bytes came back, the break was counted, and with
PARMRK set it read as FF 00 00.

The series also builds on v7.3-rc7 with pmac32_defconfig and W=1 without
warnings. I have not tested 68k Macs or macio Power Macs.

I found these bugs and wrote the patches with the help of Claude Opus
5.5. I have reviewed both patches and run the tests on the 6200 myself.

Tim Douglas (2):
  serial: pmac_zilog: push received data to the port that received it
  serial: pmac_zilog: report received breaks

 drivers/tty/serial/pmac_zilog.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)


base-commit: 24a19b953e2a3d0ea5a8c4951a0ab8f32720c907
-- 
2.54.0 (Apple Git-157)