diff options
| -rw-r--r-- | drivers/serial/serial_zynq.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c index fd999368ab7..6bb003dc155 100644 --- a/drivers/serial/serial_zynq.c +++ b/drivers/serial/serial_zynq.c @@ -21,6 +21,7 @@ #define ZYNQ_UART_SR_TXACTIVE BIT(11) /* TX active */ #define ZYNQ_UART_SR_TXFULL BIT(4) /* TX FIFO full */ +#define ZYNQ_UART_SR_TXEMPTY BIT(3) /* TX FIFO empty */ #define ZYNQ_UART_SR_RXEMPTY BIT(1) /* RX FIFO empty */ #define ZYNQ_UART_CR_TX_EN BIT(4) /* TX enabled */ @@ -107,8 +108,13 @@ static void _uart_zynq_serial_init(struct uart_zynq *regs) static int _uart_zynq_serial_putc(struct uart_zynq *regs, const char c) { - if (readl(®s->channel_sts) & ZYNQ_UART_SR_TXFULL) - return -EAGAIN; + if (CONFIG_IS_ENABLED(DEBUG_UART_ZYNQ)) { + if (!(readl(®s->channel_sts) & ZYNQ_UART_SR_TXEMPTY)) + return -EAGAIN; + } else { + if (readl(®s->channel_sts) & ZYNQ_UART_SR_TXFULL) + return -EAGAIN; + } writel(c, ®s->tx_rx_fifo); |