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authorSonic Zhang <sonic.zhang@analog.com>2009-06-11 13:50:20 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-11 08:51:04 -0700
commit84507794a9d5d4decd6bc9c111480076dba0d301 (patch)
treebb27aec4bfe27c691ae2bf7740e2ed93ac41bdc6
parent0efa4f2c944fabffc81918cc86d4d17dba39a021 (diff)
downloadvexpress-lsk-84507794a9d5d4decd6bc9c111480076dba0d301.tar.gz
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>
-rw-r--r--drivers/serial/bfin_5xx.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index ab583ef3a30..64603f5bb70 100644
--- 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))