Prevent writing to the fifo if the controller is disabled.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xxxxxxxxxx>
---
drivers/tty/serial/xilinx_uartps.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 81ba69c57716..f629c4ca940f 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1150,6 +1150,13 @@ static struct uart_driver cdns_uart_uart_driver;
*/
static void cdns_uart_console_putchar(struct uart_port *port, unsigned char ch)
{
+ unsigned int ctrl_reg;
+
+ ctrl_reg = readl(port->membase + CDNS_UART_CR);
+ while (ctrl_reg & CDNS_UART_CR_TX_DIS) {
+ ctrl_reg = readl(port->membase + CDNS_UART_CR);
+ cpu_relax();
+ }
while (readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)
cpu_relax();
writel(ch, port->membase + CDNS_UART_FIFO);
--
2.25.1
