1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/serial/pxa.c b/drivers/serial/pxa.c
index b8629d74f6a2..1102a39b44f5 100644
--- a/drivers/serial/pxa.c
+++ b/drivers/serial/pxa.c
@@ -44,6 +44,7 @@
 #include <linux/serial_core.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/slab.h>
 
 struct uart_pxa_port {
         struct uart_port        port;
@@ -438,6 +439,7 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
         unsigned char cval, fcr = 0;
         unsigned long flags;
         unsigned int baud, quot;
+        unsigned int dll;
 
         switch (termios->c_cflag & CSIZE) {
         case CS5:
@@ -534,10 +536,18 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
         else
                 up->mcr &= ~UART_MCR_AFE;
 
-        serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+        serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
         serial_out(up, UART_DLL, quot & 0xff);          /* LS of divisor */
+
+        /*
+         * work around Errata #75 according to Intel(R) PXA27x Processor Family
+         * Specification Update (Nov 2005)
+         */
+        dll = serial_in(up, UART_DLL);
+        WARN_ON(dll != (quot & 0xff));
+
         serial_out(up, UART_DLM, quot >> 8);            /* MS of divisor */
-        serial_out(up, UART_LCR, cval);         /* reset DLAB */
+        serial_out(up, UART_LCR, cval);                 /* reset DLAB */
         up->lcr = cval;                                 /* Save LCR */
         serial_pxa_set_mctrl(&up->port, up->port.mctrl);
         serial_out(up, UART_FCR, fcr);
@@ -747,7 +757,7 @@ static int serial_pxa_resume(struct device *dev)
         return 0;
 }
 
-static struct dev_pm_ops serial_pxa_pm_ops = {
+static const struct dev_pm_ops serial_pxa_pm_ops = {
         .suspend        = serial_pxa_suspend,
         .resume         = serial_pxa_resume,
 };