From: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xxxxxxxxxx> 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: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx> Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx> [stelford@xxxxxxxxxxx: cherry picked from https://github.com/Xilinx/linux-xlnx commit 0db7a24fb219e740b4615f9506b0185f5abddc84] Signed-off-by: Scott Telford <stelford@xxxxxxxxxxx> --- drivers/tty/serial/xilinx_uartps.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 8a79eeb..ac4e3a5 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -675,6 +675,9 @@ 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. @@ -774,6 +777,10 @@ 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. -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
