Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jiri Slaby <jslaby@suse.cz>
To:     gregkh@linuxfoundation.org
Cc:     =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>,
        linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jiri Slaby <jslaby@suse.cz>
Subject: [PATCH v4 04/10] tty: serial: extract lqasc_tx_ready() from lqasc_tx_chars()
Date:   Tue, 20 Sep 2022 07:20:44 +0200
Message-Id: <20220920052049.20507-5-jslaby@suse.cz>
In-Reply-To: <20220920052049.20507-1-jslaby@suse.cz>
References: <20220920052049.20507-1-jslaby@suse.cz>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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

(Put it before lqasc_start_tx(), so that we can use it there later.)

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---

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

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

diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 6637b3caa6b7..6da1b7496c6c 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -139,6 +139,13 @@ lqasc_stop_tx(struct uart_port *port)
 	return;
 }
 
+static bool lqasc_tx_ready(struct uart_port *port)
+{
+	u32 fstat = __raw_readl(port->membase + LTQ_ASC_FSTAT);
+
+	return (fstat & ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF;
+}
+
 static void
 lqasc_start_tx(struct uart_port *port)
 {
@@ -228,8 +235,7 @@ lqasc_tx_chars(struct uart_port *port)
 		return;
 	}
 
-	while (((__raw_readl(port->membase + LTQ_ASC_FSTAT) &
-		ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) {
+	while (lqasc_tx_ready(port)) {
 		if (port->x_char) {
 			writeb(port->x_char, port->membase + LTQ_ASC_TBUF);
 			port->icount.tx++;
-- 
2.37.3