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serial: imx: set_termios(): preserve RTS state 

imx_set_termios() cleared RTS on every call, now fixed.

Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sergey Organov <sorganov@gmail.com>
Link: https://lore.kernel.org/r/1561558293-7683-5-git-send-email-sorganov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergey Organov 2019-06-26 17:11:30 +03:00 committed by Greg Kroah-Hartman
parent ddf89e7503
commit 011bd05d1f
1 changed files with 9 additions and 5 deletions
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14
drivers/tty/serial/imx.c
View File

@ -1562,7 +1562,14 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
spin_lock_irqsave(&sport->port.lock, flags);
ucr2 = UCR2_SRST | UCR2_IRTS;
/*
* Read current UCR2 and save it for future use, then clear all the bits
* except those we will or may need to preserve.
*/
old_ucr2 = imx_uart_readl(sport, UCR2);
ucr2 = old_ucr2 & (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN | UCR2_CTS);
ucr2 |= UCR2_SRST | UCR2_IRTS;
if ((termios->c_cflag & CSIZE) == CS8)
ucr2 |= UCR2_WS;
@ -1631,7 +1638,6 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
imx_uart_writel(sport,
old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
UCR1);
old_ucr2 = imx_uart_readl(sport, UCR2);
imx_uart_writel(sport, old_ucr2 & ~UCR2_ATEN, UCR2);
while (!(imx_uart_readl(sport, USR2) & USR2_TXDC))
@ -1639,7 +1645,6 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
/* then, disable everything */
imx_uart_writel(sport, old_ucr2 & ~(UCR2_TXEN | UCR2_RXEN | UCR2_ATEN), UCR2);
old_ucr2 &= (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN);
/* custom-baudrate handling */
div = sport->port.uartclk / (baud * 16);
@ -1677,8 +1682,7 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
imx_uart_writel(sport, old_ucr1, UCR1);
/* set the parity, stop bits and data size */
imx_uart_writel(sport, ucr2 | old_ucr2, UCR2);
imx_uart_writel(sport, ucr2, UCR2);
if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
imx_uart_enable_ms(&sport->port);