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serial: sc16is7xx: Clear RS485 bits in the shutdown

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[ Upstream commit 927728a34f11b5a27f4610bdb7068317d6fdc72a ]

We tested RS485 function on an EVB which has SC16IS752, after
finishing the test, we started the RS232 function test, but found the
RTS is still working in the RS485 mode.

That is because both startup and shutdown call port_update() to set
the EFCR_REG, this will not clear the RS485 bits once the bits are set
in the reconf_rs485(). To fix it, clear the RS485 bits in shutdown.

Cc: <stable@vger.kernel.org>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20220308110042.108451-1-hui.wang@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hui Wang
2022-03-08 19:00:42 +08:00
committed by Greg Kroah-Hartman
parent 5dce84f475
commit 170a08ad3d
1 changed files with 4 additions and 2 deletions
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6
drivers/tty/serial/sc16is7xx.c
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@@ -1055,10 +1055,12 @@ static void sc16is7xx_shutdown(struct uart_port *port)
/* Disable all interrupts */
sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
/* Disable TX/RX */
/* Disable TX/RX, clear auto RS485 and RTS invert */
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
SC16IS7XX_EFCR_RXDISABLE_BIT |
SC16IS7XX_EFCR_TXDISABLE_BIT,
SC16IS7XX_EFCR_TXDISABLE_BIT |
SC16IS7XX_EFCR_AUTO_RS485_BIT |
SC16IS7XX_EFCR_RTS_INVERT_BIT,
SC16IS7XX_EFCR_RXDISABLE_BIT |
SC16IS7XX_EFCR_TXDISABLE_BIT);