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Subject[PATCH] Fix CTS handling in pmac-zilog.c
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(From: Paul Mackerras <paulus@samba.org>)

This patch fixes a bug in the pmac-zilog driver where if you enable
CRTSCTS mode, it won't output data when CTS is asserted. On
powermacs, the CTS input is inverted. It also fixes a logic bug in
testing for CTS and DCD changes.

diff -urN linux-2.5/drivers/serial/pmac_zilog.c pmac-2.5/drivers/serial/pmac_zilog.c
--- linux-2.5/drivers/serial/pmac_zilog.c 2004-04-01 06:59:37.000000000 +1000
+++ pmac-2.5/drivers/serial/pmac_zilog.c 2004-05-07 21:06:49.000000000 +1000
@@ -352,13 +352,14 @@
/* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
* But it does not tell us which bit has changed, we have to keep
* track of this ourselves.
+ * The CTS input is inverted for some reason. -- paulus
*/
- if ((status & DCD) ^ uap->prev_status)
+ if ((status ^ uap->prev_status) & DCD)
uart_handle_dcd_change(&uap->port,
(status & DCD));
- if ((status & CTS) ^ uap->prev_status)
+ if ((status ^ uap->prev_status) & CTS)
uart_handle_cts_change(&uap->port,
- (status & CTS));
+ !(status & CTS));

wake_up_interruptible(&uap->port.info->delta_msr_wait);
}
@@ -595,7 +596,7 @@
ret |= TIOCM_CAR;
if (status & SYNC_HUNT)
ret |= TIOCM_DSR;
- if (status & CTS)
+ if (!(status & CTS))
ret |= TIOCM_CTS;

return ret;
--
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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