1 files changed, 27 insertions, 7 deletions

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index d192dcbb82f5..f80904145fd4 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -46,6 +46,13 @@
 
 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
 
+/* SCR register bitmasks */
+#define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK               (1 << 7)
+
+/* FCR register bitmasks */
+#define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT                6
+#define OMAP_UART_FCR_RX_FIFO_TRIG_MASK                 (0x3 << 6)
+
 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 
 /* Forward declaration of functions */
@@ -129,6 +136,7 @@ static void serial_omap_enable_ms(struct uart_port *port)
 static void serial_omap_stop_tx(struct uart_port *port)
 {
         struct uart_omap_port *up = (struct uart_omap_port *)port;
+        struct omap_uart_port_info *pdata = up->pdev->dev.platform_data;
 
         if (up->use_dma &&
                 up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
@@ -151,6 +159,9 @@ static void serial_omap_stop_tx(struct uart_port *port)
                 serial_out(up, UART_IER, up->ier);
         }
 
+        if (!up->use_dma && pdata->set_forceidle)
+                pdata->set_forceidle(up->pdev);
+
         pm_runtime_mark_last_busy(&up->pdev->dev);
         pm_runtime_put_autosuspend(&up->pdev->dev);
 }
@@ -279,6 +290,7 @@ static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
 static void serial_omap_start_tx(struct uart_port *port)
 {
         struct uart_omap_port *up = (struct uart_omap_port *)port;
+        struct omap_uart_port_info *pdata = up->pdev->dev.platform_data;
         struct circ_buf *xmit;
         unsigned int start;
         int ret = 0;
@@ -286,6 +298,8 @@ static void serial_omap_start_tx(struct uart_port *port)
         if (!up->use_dma) {
                 pm_runtime_get_sync(&up->pdev->dev);
                 serial_omap_enable_ier_thri(up);
+                if (pdata->set_noidle)
+                        pdata->set_noidle(up->pdev);
                 pm_runtime_mark_last_busy(&up->pdev->dev);
                 pm_runtime_put_autosuspend(&up->pdev->dev);
                 return;
@@ -726,8 +740,7 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
         quot = serial_omap_get_divisor(port, baud);
 
         /* calculate wakeup latency constraint */
-        up->calc_latency = (1000000 * up->port.fifosize) /
-                                (1000 * baud / 8);
+        up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
         up->latency = up->calc_latency;
         schedule_work(&up->qos_work);
 
@@ -811,14 +824,21 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
         up->mcr = serial_in(up, UART_MCR);
         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
         /* FIFO ENABLE, DMA MODE */
-        serial_out(up, UART_FCR, up->fcr);
-        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+        up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
 
         if (up->use_dma) {
                 serial_out(up, UART_TI752_TLR, 0);
-                up->scr |= (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8);
+                up->scr |= UART_FCR_TRIGGER_4;
+        } else {
+                /* Set receive FIFO threshold to 1 byte */
+                up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
+                up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT);
         }
 
+        serial_out(up, UART_FCR, up->fcr);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
         serial_out(up, UART_OMAP_SCR, up->scr);
 
         serial_out(up, UART_EFR, up->efr);
@@ -1160,7 +1180,7 @@ static struct uart_driver serial_omap_reg = {
         .cons           = OMAP_CONSOLE,
 };
 
-#ifdef CONFIG_SUSPEND
+#ifdef CONFIG_PM_SLEEP
 static int serial_omap_suspend(struct device *dev)
 {
         struct uart_omap_port *up = dev_get_drvdata(dev);
@@ -1521,6 +1541,7 @@ static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
         }
 }
 
+#ifdef CONFIG_PM_RUNTIME
 static void serial_omap_restore_context(struct uart_omap_port *up)
 {
         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
@@ -1550,7 +1571,6 @@ static void serial_omap_restore_context(struct uart_omap_port *up)
                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
 }
 
-#ifdef CONFIG_PM_RUNTIME
 static int serial_omap_runtime_suspend(struct device *dev)
 {
         struct uart_omap_port *up = dev_get_drvdata(dev);