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From:   Serge Semin <Sergey.Semin@baikalelectronics.ru>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC:     Serge Semin <Sergey.Semin@baikalelectronics.ru>,
        Serge Semin <fancer.lancer@gmail.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Maxime Ripard <mripard@kernel.org>,
        Will Deacon <will@kernel.org>,
        Russell King <linux@armlinux.org.uk>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v9 3/4] serial: 8250_dw: Pass the same rate to the clk round and set rate methods
Date:   Thu, 23 Jul 2020 03:33:56 +0300
Message-ID: <20200723003357.26897-4-Sergey.Semin@baikalelectronics.ru>
In-Reply-To: <20200723003357.26897-1-Sergey.Semin@baikalelectronics.ru>
References: <20200723003357.26897-1-Sergey.Semin@baikalelectronics.ru>
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Sender: linux-kernel-owner@vger.kernel.org
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Indeed according to the clk API if clk_round_rate() has successfully
accepted a rate, then in order setup the clock with value returned by the
clk_round_rate() the clk_set_rate() method must be called with the
original rate value.

Suggested-by: Russell King <linux@armlinux.org.uk>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v8:
- This is a new patch created by the Russell King suggestion.
---
 drivers/tty/serial/8250/8250_dw.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 12866083731d..c1511f9244bb 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -275,15 +275,15 @@ dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
 static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
 			       struct ktermios *old)
 {
-	unsigned int baud = tty_termios_baud_rate(termios);
+	unsigned long newrate = tty_termios_baud_rate(termios) * 16;
 	struct dw8250_data *d = to_dw8250_data(p->private_data);
 	long rate;
 	int ret;
 
 	clk_disable_unprepare(d->clk);
-	rate = clk_round_rate(d->clk, baud * 16);
+	rate = clk_round_rate(d->clk, newrate);
 	if (rate > 0) {
-		ret = clk_set_rate(d->clk, rate);
+		ret = clk_set_rate(d->clk, newrate);
 		if (!ret)
 			p->uartclk = rate;
 	}
-- 
2.26.2