[PATCH v2 3/3] tty: serial: xuartps: Wait for rx and tx reset done status
From: Nava kishore Manne <hidden>
Date: 2016-09-15 09:16:12
Also in:
linux-arm-kernel, linux-devicetree, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
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 <redacted> --- Changes for v2: -Added New patch drivers/tty/serial/xilinx_uartps.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 527526e..b69dea3 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.
--
2.1.2