linux-kernel - [PATCH 61/70] mxser: decrypt FCR values

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Date:   Fri, 18 Jun 2021 08:15:07 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 61/70] mxser: decrypt FCR values

Currently, some of the values written to FCR are magic constants. But
they are composed of well-defined bits. Use these named macros in place
of the constants.

No changes in objdump -d.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/tty/mxser.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 1a8698e58b1c..c8ba062d8824 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -1580,7 +1580,9 @@ static u8 mxser_receive_chars_old(struct tty_struct *tty,
 
 		ch = inb(port->ioaddr + UART_RX);
 		if (hwid && (status & UART_LSR_OE))
-			outb(0x23, port->ioaddr + UART_FCR);
+			outb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
+					MOXA_MUST_FCR_GDA_MODE_ENABLE,
+					port->ioaddr + UART_FCR);
 		status &= port->read_status_mask;
 		if (status & port->ignore_status_mask) {
 			if (++ignored > 100)
@@ -1693,7 +1695,9 @@ static bool mxser_port_isr(struct mxser_port *port)
 	tty = tty_port_tty_get(&port->port);
 	if (!tty || port->closing || !tty_port_initialized(&port->port)) {
 		status = inb(port->ioaddr + UART_LSR);
-		outb(0x27, port->ioaddr + UART_FCR);
+		outb(MOXA_MUST_FCR_GDA_MODE_ENABLE | UART_FCR_ENABLE_FIFO |
+				UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+				port->ioaddr + UART_FCR);
 		inb(port->ioaddr + UART_MSR);
 
 		error = true;
-- 
2.32.0