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From c3181f01d21953bff9971e141a193c445099e90f Mon Sep 17 00:00:00 2001
From: Nathan Rossi <nathan.rossi@xilinx.com>
Date: Mon, 24 Nov 2014 15:11:43 +1000
Subject: [PATCH] tty: xuartps: Fix RX hang, and TX corruption in set_termios
Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
---
drivers/tty/serial/xilinx_uartps.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 7f8027f..74dd5c9 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -628,10 +628,12 @@ static void cdns_uart_set_termios(struct uart_port *port,
spin_lock_irqsave(&port->lock, flags);
- /* Empty the receive FIFO 1st before making changes */
- while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
- CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
- cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
+ /* Wait for the transmit FIFO to empty before making changes */
+ if (!(cdns_uart_readl(CDNS_UART_CR_OFFSET) & CDNS_UART_CR_TX_DIS)) {
+ while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_TXEMPTY)) {
+ cpu_relax();
+ }
}
/* Disable the TX and RX to set baud rate */
--
2.1.1
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