[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, 9 insertions, 17 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 7aca22c9976d..5996d3cd0ed8 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2182,6 +2182,14 @@ static inline void wait_for_xmitr(struct uart_8250_port *up, int bits)
         }
 }
 
+static void serial8250_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+        wait_for_xmitr(up, UART_LSR_THRE);
+        serial_out(up, UART_TX, ch);
+}
+
 /*
  *      Print a string to the serial port trying not to disturb
  *      any possible real use of the port...
@@ -2193,7 +2201,6 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
 {
         struct uart_8250_port *up = &serial8250_ports[co->index];
         unsigned int ier;
-        int i;
 
         touch_nmi_watchdog();
 
@@ -2207,22 +2214,7 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
         else
                 serial_out(up, UART_IER, 0);
 
-        /*
-         *      Now, do each character
-         */
-        for (i = 0; i < count; i++, s++) {
-                wait_for_xmitr(up, UART_LSR_THRE);
-
-                /*
-                 *      Send the character out.
-                 *      If a LF, also do CR...
-                 */
-                serial_out(up, UART_TX, *s);
-                if (*s == 10) {
-                        wait_for_xmitr(up, UART_LSR_THRE);
-                        serial_out(up, UART_TX, 13);
-                }
-        }
+        uart_console_write(&up->port, s, count, serial8250_console_putchar);
 
         /*
          *      Finally, wait for transmitter to become empty