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serial: max310x: Properly set flags in AutoCTS mode 

Commit 391f93f2ec ("serial: core: Rework hw-assisted flow control
support") has changed the way the AutoCTS mode is handled.

According to that change, serial drivers which enable H/W AutoCTS mode must
set UPSTAT_AUTORTS, UPSTAT_AUTOCTS and UPSTAT_AUTOXOFF to prevent the
serial core from inadvertently disabling RX or TX. This patch adds proper
handling of UPSTAT_AUTORTS, UPSTAT_AUTOCTS and UPSTAT_AUTOXOFF flags.

Signed-off-by: Christoph Vogtländer <c.vogtlaender@sigma-surface-science.com>
Link: https://lore.kernel.org/r/20190904121141.4570-1-c.vogtlaender@sigma-surface-science.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Christoph Vogtländer 2019-09-04 14:11:41 +02:00 committed by Greg Kroah-Hartman
parent 8966110c56
commit 5a8c296f53
1 changed files with 10 additions and 2 deletions
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12
drivers/tty/serial/max310x.c
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@ -955,15 +955,23 @@ static void max310x_set_termios(struct uart_port *port,
/* Configure flow control */
max310x_port_write(port, MAX310X_XON1_REG, termios->c_cc[VSTART]);
max310x_port_write(port, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]);
if (termios->c_cflag & CRTSCTS)
port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
if (termios->c_cflag & CRTSCTS) {
/* Enable AUTORTS and AUTOCTS */
port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
flow |= MAX310X_FLOWCTRL_AUTOCTS_BIT |
MAX310X_FLOWCTRL_AUTORTS_BIT;
}
if (termios->c_iflag & IXON)
flow |= MAX310X_FLOWCTRL_SWFLOW3_BIT |
MAX310X_FLOWCTRL_SWFLOWEN_BIT;
if (termios->c_iflag & IXOFF)
if (termios->c_iflag & IXOFF) {
port->status |= UPSTAT_AUTOXOFF;
flow |= MAX310X_FLOWCTRL_SWFLOW1_BIT |
MAX310X_FLOWCTRL_SWFLOWEN_BIT;
}
max310x_port_write(port, MAX310X_FLOWCTRL_REG, flow);
/* Get baud rate generator configuration */