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Commit 2b9e6f0a authored by Serge Semin's avatar Serge Semin Committed by Greg Kroah-Hartman
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tty: max310x: Optionally enable rs485 on startup 



UART port might be pre-configured with rs485 enabled flag at the
time of the port starting up process. In this case we need to
have the hardware rs485-related registers initialized in accordance
with the rs485 flags and settings provided by the configs descriptor.

Signed-off-by: default avatarSerge Semin <fancer.lancer@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 68f22c0c

drivers/tty/serial/max310x.c

+16 −0
Original line number Diff line number Diff line
@@ -1030,6 +1030,22 @@ static int max310x_startup(struct uart_port *port) 
	max310x_port_update(port, MAX310X_MODE2_REG,

			    MAX310X_MODE2_FIFORST_BIT, 0);



	/* Configure mode1/mode2 to have rs485/rs232 enabled at startup */

	val = (clamp(port->rs485.delay_rts_before_send, 0U, 15U) << 4) |

		clamp(port->rs485.delay_rts_after_send, 0U, 15U);

	max310x_port_write(port, MAX310X_HDPIXDELAY_REG, val);



	if (port->rs485.flags & SER_RS485_ENABLED) {

		max310x_port_update(port, MAX310X_MODE1_REG,

				    MAX310X_MODE1_TRNSCVCTRL_BIT,

				    MAX310X_MODE1_TRNSCVCTRL_BIT);



		if (!(port->rs485.flags & SER_RS485_RX_DURING_TX))

			max310x_port_update(port, MAX310X_MODE2_REG,

					    MAX310X_MODE2_ECHOSUPR_BIT,

					    MAX310X_MODE2_ECHOSUPR_BIT);

	}



	/* Configure flow control levels */

	/* Flow control halt level 96, resume level 48 */

	max310x_port_write(port, MAX310X_FLOWLVL_REG,