tty: serial: msm: Remove 115.2 Kbps maximum baud rate limitation

UART controller is capable to perform transfers up to 4 Mbps.
Remove artificial 115.2 Kbps limitation.

Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 3efb80f..dcde955 100644 (file)
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -882,6 +882,7 @@ msm_find_best_baud(struct uart_port *port, unsigned int baud)
                {    3, 0xdd,  8 },
                {    2, 0xee, 16 },
                {    1, 0xff, 31 },
+               {    0, 0xff, 31 },
        };
 
        divisor = uart_get_divisor(port, baud);
@@ -893,16 +894,29 @@ msm_find_best_baud(struct uart_port *port, unsigned int baud)
        return entry; /* Default to smallest divider */
 }
 
-static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
+static int msm_set_baud_rate(struct uart_port *port, unsigned int baud,
+                            unsigned long *saved_flags)
 {
        unsigned int rxstale, watermark, mask;
        struct msm_port *msm_port = UART_TO_MSM(port);
        const struct msm_baud_map *entry;
+       unsigned long flags;
 
        entry = msm_find_best_baud(port, baud);
 
        msm_write(port, entry->code, UART_CSR);
 
+       if (baud > 460800)
+               port->uartclk = baud * 16;
+
+       flags = *saved_flags;
+       spin_unlock_irqrestore(&port->lock, flags);
+
+       clk_set_rate(msm_port->clk, port->uartclk);
+
+       spin_lock_irqsave(&port->lock, flags);
+       *saved_flags = flags;
+
        /* RX stale watermark */
        rxstale = entry->rxstale;
        watermark = UART_IPR_STALE_LSB & rxstale;
@@ -1026,8 +1040,8 @@ static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
                msm_stop_dma(port, dma);
 
        /* calculate and set baud rate */
-       baud = uart_get_baud_rate(port, termios, old, 300, 115200);
-       baud = msm_set_baud_rate(port, baud);
+       baud = uart_get_baud_rate(port, termios, old, 300, 4000000);
+       baud = msm_set_baud_rate(port, baud, &flags);
        if (tty_termios_baud_rate(termios))
                tty_termios_encode_baud_rate(termios, baud, baud);