linux-kernel - [PATCH 13/33] serial: 8250: extract serial8250_startup

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Message-ID: <20250611100319.186924-14-jirislaby@kernel.org>
Date: Wed, 11 Jun 2025 12:02:59 +0200
From: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 13/33] serial: 8250: extract serial8250_startup_special()

Let the serial8250_do_startup() code handle the special ports (16C950,
DA830, RSA) startup in a separate function:
serial8250_startup_special().

And instead of multiple if-else-if, use switch-case. So that it can be
easily checked for PORT_RSA now too.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/serial/8250/8250_port.c | 53 +++++++++++++++++------------
 1 file changed, 32 insertions(+), 21 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 476f5fc50237..21ff56a31b56 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2111,27 +2111,13 @@ static void serial8250_put_poll_char(struct uart_port *port,
 
 #endif /* CONFIG_CONSOLE_POLL */
 
-int serial8250_do_startup(struct uart_port *port)
+static void serial8250_startup_special(struct uart_port *port)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned long flags;
-	unsigned char iir;
-	int retval;
-	u16 lsr;
-
-	if (!port->fifosize)
-		port->fifosize = uart_config[port->type].fifo_size;
-	if (!up->tx_loadsz)
-		up->tx_loadsz = uart_config[port->type].tx_loadsz;
-	if (!up->capabilities)
-		up->capabilities = uart_config[port->type].flags;
-	up->mcr = 0;
-
-	if (port->iotype != up->cur_iotype)
-		set_io_from_upio(port);
 
-	serial8250_rpm_get(up);
-	if (port->type == PORT_16C950) {
+	switch (port->type) {
+	case PORT_16C950:
 		/*
 		 * Wake up and initialize UART
 		 *
@@ -2148,9 +2134,8 @@ int serial8250_do_startup(struct uart_port *port)
 		serial_port_out(port, UART_EFR, UART_EFR_ECB);
 		serial_port_out(port, UART_LCR, 0);
 		uart_port_unlock_irqrestore(port, flags);
-	}
-
-	if (port->type == PORT_DA830) {
+		break;
+	case PORT_DA830:
 		/*
 		 * Reset the port
 		 *
@@ -2167,9 +2152,35 @@ int serial8250_do_startup(struct uart_port *port)
 				UART_DA830_PWREMU_MGMT_UTRST |
 				UART_DA830_PWREMU_MGMT_URRST |
 				UART_DA830_PWREMU_MGMT_FREE);
+		break;
+	case PORT_RSA:
+		rsa_enable(up);
+		break;
 	}
+}
+
+int serial8250_do_startup(struct uart_port *port)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+	unsigned long flags;
+	unsigned char iir;
+	int retval;
+	u16 lsr;
+
+	if (!port->fifosize)
+		port->fifosize = uart_config[port->type].fifo_size;
+	if (!up->tx_loadsz)
+		up->tx_loadsz = uart_config[port->type].tx_loadsz;
+	if (!up->capabilities)
+		up->capabilities = uart_config[port->type].flags;
+	up->mcr = 0;
+
+	if (port->iotype != up->cur_iotype)
+		set_io_from_upio(port);
+
+	serial8250_rpm_get(up);
 
-	rsa_enable(up);
+	serial8250_startup_special(port);
 
 	/*
 	 * Clear the FIFO buffers and disable them.
-- 
2.49.0