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serial: pmac_zilog: report received breaks

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pmz_status_handle() sets PMACZILOG_FLAG_BREAK from RR0, and
pmz_receive_chars() clears it on the null character that ends the
break without marking that character, then tests BRK_ABRT in RR1,
where the SCC does not set it in asynchronous mode. Breaks therefore
arrive as plain NULs: brk is never counted and BRKINT, PARMRK and SysRq
never see them.

Set BRK_ABRT in r1 for that character, as sunzilog does.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Assisted-by: LLM
Signed-off-by: Tim Douglas <me@timdoug.com>
Link: https://patch.msgid.link/20261013013541.4535-3-me@timdoug.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tim Douglas 2026-10-12 21:35:41 -04:00 committed by Greg Kroah-Hartman
parent f3dc727da3
commit 8db79ea07a
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/pmac_zilog.c
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@ -233,6 +233,7 @@ static bool pmz_receive_chars(struct uart_pmac_port *uap)
ch &= uap->parity_mask;
if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
uap->flags &= ~PMACZILOG_FLAG_BREAK;
r1 |= BRK_ABRT;
}
#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)