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| author |  Stefan Eichenberger <stefan.eichenberger@toradex.com>
| 2024-06-21 17:37:49 +0200 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2024-06-24 16:13:37 +0200 |
| commit | a81dbd0463eca317eee44985a66aa6cc2ce5c101 (patch) | |
| tree | b13423487321ef83371aa1df16c8840d30deb0ac /drivers/tty | |
| parent | tty: mcf: MCF54418 has 10 UARTS (diff) | |
| download | linux-a81dbd0463eca317eee44985a66aa6cc2ce5c101.tar.gz linux-a81dbd0463eca317eee44985a66aa6cc2ce5c101.tar.bz2 linux-a81dbd0463eca317eee44985a66aa6cc2ce5c101.zip | |
serial: imx: set receiver level before starting uart
Set the receiver level to something > 0 before calling imx_uart_start_rx
in rs485_config. This is necessary to avoid an interrupt storm that
might prevent the system from booting. This was seen on an i.MX7 device
when the rs485-rts-active-low property was active in the device tree.
Fixes: 6d215f83e5fc ("serial: imx: warn user when using unsupported configuration")
Cc: stable <stable@kernel.org>
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Link: https://lore.kernel.org/r/20240621153829.183780-1-eichest@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 2eb22594960f..f4f40c9373c2 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1952,8 +1952,10 @@ static int imx_uart_rs485_config(struct uart_port *port, struct ktermios *termio /* Make sure Rx is enabled in case Tx is active with Rx disabled */ if (!(rs485conf->flags & SER_RS485_ENABLED) || - rs485conf->flags & SER_RS485_RX_DURING_TX) + rs485conf->flags & SER_RS485_RX_DURING_TX) { + imx_uart_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); imx_uart_start_rx(port); + } return 0; } |