@@ -2415,7 +2415,7 @@ static void serial_console_write(struct console *co, const char *s,
{
struct sci_port *sci_port = &sci_ports[co->index];
struct uart_port *port = &sci_port->port;
- unsigned short bits, ctrl;
+ unsigned short bits, ctrl, ctrl_temp;
unsigned long flags;
int locked = 1;
@@ -2427,9 +2427,11 @@ static void serial_console_write(struct console *co, const char *s,
else
spin_lock(&port->lock);
- /* first save the SCSCR then disable the interrupts */
+ /* first save SCSCR then disable interrupts, keep clock source */
ctrl = serial_port_in(port, SCSCR);
- serial_port_out(port, SCSCR, sci_port->cfg->scscr);
+ ctrl_temp = (sci_port->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)) |
+ (ctrl & (SCSCR_CKE1 | SCSCR_CKE0));
+ serial_port_out(port, SCSCR, ctrl_temp);
uart_console_write(port, s, count, serial_console_putchar);
Blindly writing the default configuration value into the SCSCR register may change the clock selection bits, breaking the serial console if the current driver settings differ from the default settings. Keep the current clock selection bits to prevent this from happening on e.g. r8a7791/koelsch when support for the BRG will be added. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/tty/serial/sh-sci.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)