The RXWATER value must be greater than 0 according to the LPUART
reference manual. And when the number of datawords in the receive
FIFO is greater than RXWATER, an interrupt or a DMA request is
generated, so no need to set the different value for lpuart interrupt
case and dma case. Here delete the wrong RXWATER setting for dma case
directly.
Fixes: 42b68768e51b ("serial: fsl_lpuart: DMA support for 32-bit variant")
Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 868c2783d2c7..ba6ade784ac5 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1729,12 +1729,6 @@ static void lpuart32_configure(struct lpuart_port *sport)
{
unsigned long temp;
- if (sport->lpuart_dma_rx_use) {
- /* RXWATER must be 0 */
- temp = lpuart32_read(&sport->port, UARTWATER);
- temp &= ~(UARTWATER_WATER_MASK << UARTWATER_RXWATER_OFF);
- lpuart32_write(&sport->port, temp, UARTWATER);
- }
temp = lpuart32_read(&sport->port, UARTCTRL);
if (!sport->lpuart_dma_rx_use)
temp |= UARTCTRL_RIE | UARTCTRL_ILIE;
--
2.17.1
