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-rw-r--r--hw/char/cadence_uart.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c
index 3eeadb18fd..3bcaf2905d 100644
--- a/hw/char/cadence_uart.c
+++ b/hw/char/cadence_uart.c
@@ -233,8 +233,16 @@ static void uart_parameters_setup(UartState *s)
static int uart_can_receive(void *opaque)
{
UartState *s = (UartState *)opaque;
+ int ret = MAX(RX_FIFO_SIZE, TX_FIFO_SIZE);
+ uint32_t ch_mode = s->r[R_MR] & UART_MR_CHMODE;
- return RX_FIFO_SIZE - s->rx_count;
+ if (ch_mode == NORMAL_MODE || ch_mode == ECHO_MODE) {
+ ret = MIN(ret, RX_FIFO_SIZE - s->rx_count);
+ }
+ if (ch_mode == REMOTE_LOOPBACK || ch_mode == ECHO_MODE) {
+ ret = MIN(ret, TX_FIFO_SIZE - s->tx_count);
+ }
+ return ret;
}
static void uart_ctrl_update(UartState *s)