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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: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Serge Semin 2019-05-14 13:14:14 +03:00 committed by Greg Kroah-Hartman
parent 68f22c0c99
commit 2b9e6f0a40
1 changed files with 16 additions and 0 deletions
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16
drivers/tty/serial/max310x.c
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@ -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,