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From 4cbf3473ca25ac47d2d1e43113afce961d057b87 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 e46e9f3..eb00754 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -646,10 +646,12 @@ static void xuartps_set_termios(struct uart_port *port,
spin_lock_irqsave(&port->lock, flags);
- /* Empty the receive FIFO 1st before making changes */
- while ((xuartps_readl(XUARTPS_SR_OFFSET) &
- XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
- xuartps_readl(XUARTPS_FIFO_OFFSET);
+ /* Wait for the transmit FIFO to empty before making changes */
+ if (!(xuartps_readl(XUARTPS_CR_OFFSET) & XUARTPS_CR_TX_DIS)) {
+ while (!(xuartps_readl(XUARTPS_SR_OFFSET) &
+ XUARTPS_SR_TXEMPTY)) {
+ cpu_relax();
+ }
}
/* Disable the TX and RX to set baud rate */
--
2.1.1
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