This reverts commit 9ad9df8447547febe9dd09b040f4528a09e495f0.
LSUART's datasheet incorrectly states that RXWATER must be greater than
0. Having that set to 1 is causing a one character delay on the receive
path.
Signed-off-by: Robert Hodaszi <robert.hodaszi@xxxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 7486a2b8556c..8f1bb0a378d4 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1762,6 +1762,12 @@ 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;
--
2.34.1
