[PATCH v4 05/10] tty: serial: extract tx_ready() from __serial_lpc32xx_tx()

[Jiri Slaby]

The condition in __serial_lpc32xx_tx()'s loop is barely readable.
Extract it to a separate function. This will make the cleanup in the
next patches easier too.

Cc: Vladimir Zapolskiy <vz at mleia.com>
Cc: <linux-arm-kernel at lists.infradead.org>
Signed-off-by: Jiri Slaby <jslaby at suse.cz>
---

Notes:
    [v4] this is new in v4 -- extracted as a separate change

 drivers/tty/serial/lpc32xx_hs.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 0d5ef7df27d0..ed47f4768338 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -278,6 +278,13 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 
 static void serial_lpc32xx_stop_tx(struct uart_port *port);
 
+static bool serial_lpc32xx_tx_ready(struct uart_port *port)
+{
+	u32 level = readl(LPC32XX_HSUART_LEVEL(port->membase));
+
+	return LPC32XX_HSU_TX_LEV(level) < 64;
+}
+
 static void __serial_lpc32xx_tx(struct uart_port *port)
 {
 	struct circ_buf *xmit = &port->state->xmit;
@@ -293,8 +300,7 @@ static void __serial_lpc32xx_tx(struct uart_port *port)
 		goto exit_tx;
 
 	/* Transfer data */
-	while (LPC32XX_HSU_TX_LEV(readl(
-		LPC32XX_HSUART_LEVEL(port->membase))) < 64) {
+	while (serial_lpc32xx_tx_ready(port)) {
 		writel((u32) xmit->buf[xmit->tail],
 		       LPC32XX_HSUART_FIFO(port->membase));
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-- 
2.37.3