Revert "serial: sc16is7xx: Clear RS485 bits in the shutdown"

This reverts commit 927728a34f11b5a27f4610bdb7068317d6fdc72a.

Once the uart_port->rs485->flag is set to SER_RS485_ENABLED, the port
should always work in RS485 mode. If users want the port to leave
RS485 mode, they need to call ioctl() to clear SER_RS485_ENABLED.

So here we shouldn't clear the RS485 bits in the shutdown().

Fixes: 927728a34f11 ("serial: sc16is7xx: Clear RS485 bits in the shutdown")
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20220418094339.678144-1-hui.wang@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index e857fb61efbfc4207fffee2b50324f66ad60a768..5fb201c1b563b3550f4caf4cb3e48070a1d5e9a6 100644 (file)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1238,12 +1238,10 @@ static void sc16is7xx_shutdown(struct uart_port *port)
 
        /* Disable all interrupts */
        sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
-       /* Disable TX/RX, clear auto RS485 and RTS invert */
+       /* Disable TX/RX */
        sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
                              SC16IS7XX_EFCR_RXDISABLE_BIT |
-                             SC16IS7XX_EFCR_TXDISABLE_BIT |
-                             SC16IS7XX_EFCR_AUTO_RS485_BIT |
-                             SC16IS7XX_EFCR_RTS_INVERT_BIT,
+                             SC16IS7XX_EFCR_TXDISABLE_BIT,
                              SC16IS7XX_EFCR_RXDISABLE_BIT |
                              SC16IS7XX_EFCR_TXDISABLE_BIT);