1 files changed, 27 insertions, 12 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 342e12fb1c25..8058533f8418 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1908,15 +1908,23 @@ static int serial8250_startup(struct uart_port *port)
                  * kick the UART on a regular basis.
                  */
                 if (!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) {
+                        up->bugs |= UART_BUG_THRE;
                         pr_debug("ttyS%d - using backup timer\n", port->line);
-                        up->timer.function = serial8250_backup_timeout;
-                        up->timer.data = (unsigned long)up;
-                        mod_timer(&up->timer, jiffies +
-                                poll_timeout(up->port.timeout) + HZ / 5);
                 }
         }
 
         /*
+         * The above check will only give an accurate result the first time
+         * the port is opened so this value needs to be preserved.
+         */
+        if (up->bugs & UART_BUG_THRE) {
+                up->timer.function = serial8250_backup_timeout;
+                up->timer.data = (unsigned long)up;
+                mod_timer(&up->timer, jiffies +
+                          poll_timeout(up->port.timeout) + HZ / 5);
+        }
+
+        /*
          * If the "interrupt" for this port doesn't correspond with any
          * hardware interrupt, we use a timer-based system.  The original
          * driver used to do this with IRQ0.
@@ -2203,9 +2211,9 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
                 serial_outp(up, UART_EFR, efr);
         }
 
-#ifdef CONFIG_ARCH_OMAP15XX
+#ifdef CONFIG_ARCH_OMAP
         /* Workaround to enable 115200 baud on OMAP1510 internal ports */
-        if (cpu_is_omap1510() && is_omap_port((unsigned int)up->port.membase)) {
+        if (cpu_is_omap1510() && is_omap_port(up)) {
                 if (baud == 115200) {
                         quot = 1;
                         serial_out(up, UART_OMAP_OSC_12M_SEL, 1);
@@ -2258,18 +2266,27 @@ serial8250_pm(struct uart_port *port, unsigned int state,
                 p->pm(port, state, oldstate);
 }
 
+static unsigned int serial8250_port_size(struct uart_8250_port *pt)
+{
+        if (pt->port.iotype == UPIO_AU)
+                return 0x100000;
+#ifdef CONFIG_ARCH_OMAP
+        if (is_omap_port(pt))
+                return 0x16 << pt->port.regshift;
+#endif
+        return 8 << pt->port.regshift;
+}
+
 /*
  * Resource handling.
  */
 static int serial8250_request_std_resource(struct uart_8250_port *up)
 {
-        unsigned int size = 8 << up->port.regshift;
+        unsigned int size = serial8250_port_size(up);
         int ret = 0;
 
         switch (up->port.iotype) {
         case UPIO_AU:
-                size = 0x100000;
-                /* fall thru */
         case UPIO_TSI:
         case UPIO_MEM32:
         case UPIO_MEM:
@@ -2303,12 +2320,10 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
 
 static void serial8250_release_std_resource(struct uart_8250_port *up)
 {
-        unsigned int size = 8 << up->port.regshift;
+        unsigned int size = serial8250_port_size(up);
 
         switch (up->port.iotype) {
         case UPIO_AU:
-                size = 0x100000;
-                /* fall thru */
         case UPIO_TSI:
         case UPIO_MEM32:
         case UPIO_MEM: