[SERIAL] kernel console should send CRLF not LFCR

Glen Turner reported that writing LFCR rather than the more
traditional CRLF causes issues with some terminals.

Since this aflicts many serial drivers, extract the common code
to a library function (uart_console_write) and arrange for each
driver to supply a "putchar" function.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 16 deletions

diff --git a/drivers/serial/at91_serial.c b/drivers/serial/at91_serial.c
index 2113feb75c39..6547fe0cef96 100644
--- a/drivers/serial/at91_serial.c
+++ b/drivers/serial/at91_serial.c
@@ -711,6 +711,12 @@ void __init at91_register_uart(int idx, int port)
 }
 
 #ifdef CONFIG_SERIAL_AT91_CONSOLE
+static void at91_console_putchar(struct uart_port *port, int ch)
+{
+        while (!(UART_GET_CSR(port) & AT91_US_TXRDY))
+                barrier();
+        UART_PUT_CHAR(port, ch);
+}
 
 /*
  * Interrupts are disabled on entering
@@ -718,7 +724,7 @@ void __init at91_register_uart(int idx, int port)
 static void at91_console_write(struct console *co, const char *s, u_int count)
 {
         struct uart_port *port = at91_ports + co->index;
-        unsigned int status, i, imr;
+        unsigned int status, imr;
 
         /*
          *      First, save IMR and then disable interrupts
@@ -726,21 +732,7 @@ static void at91_console_write(struct console *co, const char *s, u_int count)
         imr = UART_GET_IMR(port);       /* get interrupt mask */
         UART_PUT_IDR(port, AT91_US_RXRDY | AT91_US_TXRDY);
 
-        /*
-         *      Now, do each character
-         */
-        for (i = 0; i < count; i++) {
-                do {
-                        status = UART_GET_CSR(port);
-                } while (!(status & AT91_US_TXRDY));
-                UART_PUT_CHAR(port, s[i]);
-                if (s[i] == '\n') {
-                        do {
-                                status = UART_GET_CSR(port);
-                        } while (!(status & AT91_US_TXRDY));
-                        UART_PUT_CHAR(port, '\r');
-                }
-        }
+        uart_console_write(port, s, count, at91_console_putchar);
 
         /*
          *      Finally, wait for transmitter to become empty