[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/amba-pl010.c b/drivers/serial/amba-pl010.c
index 321a3b3a5728..e04d5e82d9ae 100644
--- a/drivers/serial/amba-pl010.c
+++ b/drivers/serial/amba-pl010.c
@@ -591,12 +591,18 @@ static struct uart_amba_port amba_ports[UART_NR] = {
 
 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
 
+static void pl010_console_putchar(struct uart_port *port, int ch)
+{
+        while (!UART_TX_READY(UART_GET_FR(port)))
+                barrier();
+        UART_PUT_CHAR(port, ch);
+}
+
 static void
 pl010_console_write(struct console *co, const char *s, unsigned int count)
 {
         struct uart_port *port = &amba_ports[co->index].port;
         unsigned int status, old_cr;
-        int i;
 
         /*
          *      First save the CR then disable the interrupts
@@ -604,21 +610,7 @@ pl010_console_write(struct console *co, const char *s, unsigned int count)
         old_cr = UART_GET_CR(port);
         UART_PUT_CR(port, UART01x_CR_UARTEN);
 
-        /*
-         *      Now, do each character
-         */
-        for (i = 0; i < count; i++) {
-                do {
-                        status = UART_GET_FR(port);
-                } while (!UART_TX_READY(status));
-                UART_PUT_CHAR(port, s[i]);
-                if (s[i] == '\n') {
-                        do {
-                                status = UART_GET_FR(port);
-                        } while (!UART_TX_READY(status));
-                        UART_PUT_CHAR(port, '\r');
-                }
-        }
+        uart_console_write(port, s, count, pl010_console_putchar);
 
         /*
          *      Finally, wait for transmitter to become empty