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Blackfin Serial Driver: handle anomaly 05000231 

05000231 - UART STB Bit Incorrectly Affects Receiver Setting
For processors affected by this, we cannot safely allow CSTOPB to be set
as the UART will then be unable to properly clock in bytes.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sonic Zhang 2009-06-11 13:50:20 +01:00 committed by Linus Torvalds
parent 0efa4f2c94
commit 84507794a9
1 changed files with 10 additions and 2 deletions
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12
drivers/serial/bfin_5xx.c
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@ -828,8 +828,16 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
__func__);
}
if (termios->c_cflag & CSTOPB)
lcr |= STB;
/* Anomaly notes:
* 05000231 - STOP bit is always set to 1 whatever the user is set.
*/
if (termios->c_cflag & CSTOPB) {
if (ANOMALY_05000231)
printk(KERN_WARNING "STOP bits other than 1 is not "
"supported in case of anomaly 05000231.\n");
else
lcr |= STB;
}
if (termios->c_cflag & PARENB)
lcr |= PEN;
if (!(termios->c_cflag & PARODD))