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authorJulien BLACHE <jblache@debian.org>2006-07-09 20:40:17 +0200
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-07-09 21:11:09 +0100
commitc65b15cfd6b8b74c6f2b3635bf47ee661d351ef3 (patch)
tree605df0aef4afe1df87f42835e66cb27a2f1d6e58 /include/linux
parentd608ab9917fbe9926704c07b27df72ac78133870 (diff)
[SERIAL] IP22: fix serial console hangs
The patch below fixes serial console hangs as seen on IP22 machines. Typically, while booting, the machine hangs for ~1 minute displaying "INIT: ", then the same thing happens again when init enters in the designated runlevel and finally the getty process on ttyS0 hangs indefinitely (though strace'ing it helps). strace (-e raw=ioctl, otherwise the ioctl() translation is utterly bogus) reveals that getty hangs on ioctl() 0x540f which happens to be TCSETSW (I saw it hang on another console ioctl() but couldn't reproduce that one). A diff between ip22zilog and sunzilog revealed the following differences: 1. the channel A flag being set on up.port.flags instead of up.flags 2. the channel A flag being set on what is marked as being channel B 3. sunzilog has a call to uart_update_timeout(port, termios->c_cflag, baud); at the end of sunzilog_set_termios(), which ip22zilog lacks (on purpose ?) The patch below addresses point 1 and fixes the serial console hangs just fine. However point 2 should be investigated by someone familiar with the IP22 Zilog; it's probably OK as is but even if it is, a comment in ip22zilog.c is badly needed. Point 3 is left as an exercise for whoever feels like digging into ip22zilog :) These are the main obvious differences between ip22zilog and sunzilog. Newer versions of sunzilog (Linus's git tree as of today) are more close to ip22zilog as the sbus_{write,read}b have been changed into simple {write,read}b, which shrinks the diff by a fair amount. Resyncing both drivers should be doable in a few hours time now for someone familiar with the IP22 Zilog hardware. Signed-off-by: Julien BLACHE <jb@jblache.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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