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authorNava kishore Manne <nava.manne@xilinx.com>2016-09-15 14:45:31 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-22 11:46:12 +0200
commit27b17ae0732a607532e58b3d52b0b636d82269da (patch)
tree2791290bec876f6ebb1bcbf061893f99b0392d58 /drivers/tty
parent3816b2f886d0918d8a8ae593b2db203ab905a889 (diff)
downloadlinux-27b17ae0732a607532e58b3d52b0b636d82269da.tar.bz2
tty: serial: xuartps: Wait for rx and tx reset done status
After issuing the reset, driver is not checking the rx and tx reset done status. So, modified driver to wait for the reset done status. Signed-off-by: Nava kishore Manne <navam@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/xilinx_uartps.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index bf06d2c6b96e..e0c6a8619b9f 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -694,6 +694,10 @@ static void cdns_uart_set_termios(struct uart_port *port,
ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
writel(ctrl_reg, port->membase + CDNS_UART_CR);
+ while (readl(port->membase + CDNS_UART_CR) &
+ (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
+ cpu_relax();
+
/*
* Clear the RX disable and TX disable bits and then set the TX enable
* bit and RX enable bit to enable the transmitter and receiver.
@@ -797,6 +801,10 @@ static int cdns_uart_startup(struct uart_port *port)
writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST,
port->membase + CDNS_UART_CR);
+ while (readl(port->membase + CDNS_UART_CR) &
+ (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
+ cpu_relax();
+
/*
* Clear the RX disable bit and then set the RX enable bit to enable
* the receiver.