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Subject[PATCH 2/3] tty: serial: fsl_lpuart: remove RTS/CTS control from set/get_mctrl
Date
The LPUART does not provide manual control of RTS/CTS signals,
those can only be controlled by the hardware directly. Therefore
manual control of those signals through mctrl can not be provided.
The current implementation enables/disables the automatic control,
which is not what mctrl should do, hence remove the incorrect
implementation.

Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
---
drivers/tty/serial/fsl_lpuart.c | 56 ++++++++---------------------------------
1 file changed, 10 insertions(+), 46 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 08ce76f..357f623 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -822,64 +822,28 @@ static unsigned int lpuart32_tx_empty(struct uart_port *port)

static unsigned int lpuart_get_mctrl(struct uart_port *port)
{
- unsigned int temp = 0;
- unsigned char reg;
-
- reg = readb(port->membase + UARTMODEM);
- if (reg & UARTMODEM_TXCTSE)
- temp |= TIOCM_CTS;
-
- if (reg & UARTMODEM_RXRTSE)
- temp |= TIOCM_RTS;
-
- return temp;
+ return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
}

static unsigned int lpuart32_get_mctrl(struct uart_port *port)
{
- unsigned int temp = 0;
- unsigned long reg;
-
- reg = lpuart32_read(port->membase + UARTMODIR);
- if (reg & UARTMODIR_TXCTSE)
- temp |= TIOCM_CTS;
-
- if (reg & UARTMODIR_RXRTSE)
- temp |= TIOCM_RTS;
-
- return temp;
+ return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
}

static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
- unsigned char temp;
-
- temp = readb(port->membase + UARTMODEM) &
- ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
-
- if (mctrl & TIOCM_RTS)
- temp |= UARTMODEM_RXRTSE;
-
- if (mctrl & TIOCM_CTS)
- temp |= UARTMODEM_TXCTSE;
-
- writeb(temp, port->membase + UARTMODEM);
+ /*
+ * CTS/RTS can _only_ be handled
+ * automatically by the hardware.
+ */
}

static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
- unsigned long temp;
-
- temp = lpuart32_read(port->membase + UARTMODIR) &
- ~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
-
- if (mctrl & TIOCM_RTS)
- temp |= UARTMODIR_RXRTSE;
-
- if (mctrl & TIOCM_CTS)
- temp |= UARTMODIR_TXCTSE;
-
- lpuart32_write(temp, port->membase + UARTMODIR);
+ /*
+ * CTS/RTS can _only_ be handled
+ * automatically by the hardware.
+ */
}

static void lpuart_break_ctl(struct uart_port *port, int break_state)
--
2.1.0


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