linux-kernel - [PATCH v2 21/23] tty: serial: fsl_lpuart: Introduce lpuart*_setup_watermark

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Message-Id: <20190731173045.11718-22-andrew.smirnov@gmail.com>
Date:   Wed, 31 Jul 2019 10:30:43 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-serial@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Stefan Agner <stefan@...er.ch>,
        Chris Healy <cphealy@...il.com>,
        Cory Tusar <cory.tusar@....aero>,
        Lucas Stach <l.stach@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-imx@....com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 21/23] tty: serial: fsl_lpuart: Introduce lpuart*_setup_watermark_enable()

Most users of lpuart*_setup_watermark() enable identical set of flags
right after the call, so combine those two action into a subroutine
and make use of it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Stefan Agner <stefan@...er.ch>
Cc: Chris Healy <cphealy@...il.com>
Cc: Cory Tusar <cory.tusar@....aero>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: linux-imx@....com
Cc: linux-serial@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/tty/serial/fsl_lpuart.c | 50 ++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 22 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 5a6516f4bc93..8ab5f9939597 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1403,6 +1403,17 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
 	writeb(cr2_saved, sport->port.membase + UARTCR2);
 }
 
+static void lpuart_setup_watermark_enable(struct lpuart_port *sport)
+{
+	unsigned char cr2;
+
+	lpuart_setup_watermark(sport);
+
+	cr2 = readb(sport->port.membase + UARTCR2);
+	cr2 |= UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE;
+	writeb(cr2, sport->port.membase + UARTCR2);
+}
+
 static void lpuart32_setup_watermark(struct lpuart_port *sport)
 {
 	unsigned long val, ctrl;
@@ -1428,6 +1439,17 @@ static void lpuart32_setup_watermark(struct lpuart_port *sport)
 	lpuart32_write(&sport->port, ctrl_saved, UARTCTRL);
 }
 
+static void lpuart32_setup_watermark_enable(struct lpuart_port *sport)
+{
+	u32 temp;
+
+	lpuart32_setup_watermark(sport);
+
+	temp = lpuart32_read(&sport->port, UARTCTRL);
+	temp |= UARTCTRL_RE | UARTCTRL_TE | UARTCTRL_ILIE;
+	lpuart32_write(&sport->port, temp, UARTCTRL);
+}
+
 static void rx_dma_timer_init(struct lpuart_port *sport)
 {
 	timer_setup(&sport->lpuart_timer, lpuart_timer_func, 0);
@@ -1488,11 +1510,7 @@ static int lpuart_startup(struct uart_port *port)
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
-	lpuart_setup_watermark(sport);
-
-	temp = readb(sport->port.membase + UARTCR2);
-	temp |= UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE;
-	writeb(temp, sport->port.membase + UARTCR2);
+	lpuart_setup_watermark_enable(sport);
 
 	lpuart_rx_dma_startup(sport);
 	lpuart_tx_dma_startup(sport);
@@ -1538,11 +1556,7 @@ static int lpuart32_startup(struct uart_port *port)
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
-	lpuart32_setup_watermark(sport);
-
-	temp = lpuart32_read(&sport->port, UARTCTRL);
-	temp |= UARTCTRL_RE | UARTCTRL_TE | UARTCTRL_ILIE;
-	lpuart32_write(&sport->port, temp, UARTCTRL);
+	lpuart32_setup_watermark_enable(sport);
 
 
 	lpuart_rx_dma_startup(sport);
@@ -2560,22 +2574,14 @@ static int lpuart_resume(struct device *dev)
 {
 	struct lpuart_port *sport = dev_get_drvdata(dev);
 	bool irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq));
-	unsigned long temp;
 
 	if (sport->port.suspended && !irq_wake)
 		lpuart_enable_clks(sport);
 
-	if (lpuart_is_32(sport)) {
-		lpuart32_setup_watermark(sport);
-		temp = lpuart32_read(&sport->port, UARTCTRL);
-		temp |= UARTCTRL_RE | UARTCTRL_TE | UARTCTRL_ILIE;
-		lpuart32_write(&sport->port, temp, UARTCTRL);
-	} else {
-		lpuart_setup_watermark(sport);
-		temp = readb(sport->port.membase + UARTCR2);
-		temp |= UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE;
-		writeb(temp, sport->port.membase + UARTCR2);
-	}
+	if (lpuart_is_32(sport))
+		lpuart32_setup_watermark_enable(sport);
+	else
+		lpuart_setup_watermark_enable(sport);
 
 	if (sport->lpuart_dma_rx_use) {
 		if (irq_wake) {
-- 
2.21.0