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authorSergiu Moga <sergiu.moga@microchip.com>2022-08-24 17:29:03 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-08-30 14:33:08 +0200
commit692a8ebcfc24f4a5bea0eb2967e450f584193da6 (patch)
treeeebc7a322b0de6d6dc20875f5bbdb85cadbd6f22
parentd5a2e0834364377a5d5a2fff1890a0b3f0bafd1f (diff)
tty: serial: atmel: Preserve previous USART mode if RS485 disabled
Whenever the atmel_rs485_config() driver method would be called, the USART mode is reset to normal mode before even checking if RS485 flag is set, thus resulting in losing the previous USART mode in the case where the checking fails. Some tools, such as `linux-serial-test`, lead to the driver calling this method when doing the setup of the serial port: after setting the port mode (Hardware Flow Control, Normal Mode, RS485 Mode, etc.), `linux-serial-test` tries to enable/disable RS485 depending on the commandline arguments that were passed. Example of how this issue could reveal itself: When doing a serial communication with Hardware Flow Control through `linux-serial-test`, the tool would lead to the driver roughly doing the following: - set the corresponding bit to 1 (ATMEL_US_USMODE_HWHS bit in the ATMEL_US_MR register) through the atmel_set_termios() to enable Hardware Flow Control - disable RS485 through the atmel_config_rs485() method Thus, when the latter is called, the mode will be reset and the previously set bit is unset, leaving USART in normal mode instead of the expected Hardware Flow Control mode. This fix ensures that this reset is only done if the checking for RS485 succeeds and that the previous mode is preserved otherwise. Fixes: e8faff7330a35 ("ARM: 6092/1: atmel_serial: support for RS485 communications") Cc: stable <stable@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com> Link: https://lore.kernel.org/r/20220824142902.502596-1-sergiu.moga@microchip.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/atmel_serial.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 30ba9eef7b39..7450d3853031 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -294,9 +294,6 @@ static int atmel_config_rs485(struct uart_port *port, struct ktermios *termios,
mode = atmel_uart_readl(port, ATMEL_US_MR);
- /* Resetting serial mode to RS232 (0x0) */
- mode &= ~ATMEL_US_USMODE;
-
if (rs485conf->flags & SER_RS485_ENABLED) {
dev_dbg(port->dev, "Setting UART to RS485\n");
if (rs485conf->flags & SER_RS485_RX_DURING_TX)
@@ -306,6 +303,7 @@ static int atmel_config_rs485(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_TTGR,
rs485conf->delay_rts_after_send);
+ mode &= ~ATMEL_US_USMODE;
mode |= ATMEL_US_USMODE_RS485;
} else {
dev_dbg(port->dev, "Setting UART to RS232\n");