We recently added support to send more than one character at a
time for UARTDM hardware but we didn't add the same support in
the console code path. Add support here to speed up console
messages on UARTDM hardware.
Cc: David Brown <davidb@xxxxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
---
drivers/tty/serial/msm_serial.c | 59 +++++++++++++++++++++++++++++++----------
1 file changed, 45 insertions(+), 14 deletions(-)
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 2094eb5..128b222 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -761,32 +761,63 @@ static inline struct uart_port *get_port_from_line(unsigned int line)
}
#ifdef CONFIG_SERIAL_MSM_CONSOLE
-
-static void msm_console_putchar(struct uart_port *port, int c)
-{
- struct msm_port *msm_port = UART_TO_MSM(port);
-
- if (msm_port->is_uartdm)
- reset_dm_count(port, 1);
-
- while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
- ;
- msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
-}
-
static void msm_console_write(struct console *co, const char *s,
unsigned int count)
{
+ int i;
struct uart_port *port;
struct msm_port *msm_port;
+ int num_newlines = 0;
+ bool replaced = false;
BUG_ON(co->index < 0 || co->index >= UART_NR);
port = get_port_from_line(co->index);
msm_port = UART_TO_MSM(port);
+ /* Account for newlines that will get a carriage return added */
+ for (i = 0; i < count; i++)
+ if (s[i] == '\n')
+ num_newlines++;
+ count += num_newlines;
+
spin_lock(&port->lock);
- uart_console_write(port, s, count, msm_console_putchar);
+ if (msm_port->is_uartdm)
+ reset_dm_count(port, count);
+
+ i = 0;
+ while (i < count) {
+ int j;
+ unsigned int num_chars;
+ char buf[4] = { 0 };
+ unsigned int *bf = (unsigned int *)&buf;
+
+ if (msm_port->is_uartdm)
+ num_chars = min(count - i, (unsigned int)sizeof(buf));
+ else
+ num_chars = 1;
+
+ for (j = 0; j < num_chars; j++) {
+ char c = *s;
+
+ if (c == '\n' && !replaced) {
+ buf[j] = '\r';
+ j++;
+ replaced = true;
+ }
+ if (j < num_chars) {
+ buf[j] = c;
+ s++;
+ replaced = false;
+ }
+ }
+
+ while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
+ cpu_relax();
+
+ msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ i += num_chars;
+ }
spin_unlock(&port->lock);
}
--
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