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>

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index ab583ef3a305aeb08fa833085d5fec3cd3efbd3f..64603f5bb7039efdedaa05810c0c99005cf3cf91 100644 (file)
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -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))