linux-kernel - [PATCH] serial: 8250_uniphier: fix dl_read and dl

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Message-Id: <1445229475-23201-1-git-send-email-yamada.masahiro@socionext.com>
Date:	Mon, 19 Oct 2015 13:37:55 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	linux-serial@...r.kernel.org
Cc:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] serial: 8250_uniphier: fix dl_read and dl_write functions

The register offset must be shifted by regshift, otherwise the
baudrate is not set.  I missed the issue probably because the
divisor register was already set by the boot loader.

Fixes: 1a8d2903cb6a ("serial: 8250_uniphier: add UniPhier serial driver")
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Hi Greg,

Please apply this simple fix for Linux 4.3.

Thanks,
Masahiro


 drivers/tty/serial/8250/8250_uniphier.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
index d11621e..245edbb 100644
--- a/drivers/tty/serial/8250/8250_uniphier.c
+++ b/drivers/tty/serial/8250/8250_uniphier.c
@@ -115,12 +115,16 @@ static void uniphier_serial_out(struct uart_port *p, int offset, int value)
  */
 static int uniphier_serial_dl_read(struct uart_8250_port *up)
 {
-	return readl(up->port.membase + UNIPHIER_UART_DLR);
+	int offset = UNIPHIER_UART_DLR << up->port.regshift;
+
+	return readl(up->port.membase + offset);
 }
 
 static void uniphier_serial_dl_write(struct uart_8250_port *up, int value)
 {
-	writel(value, up->port.membase + UNIPHIER_UART_DLR);
+	int offset = UNIPHIER_UART_DLR << up->port.regshift;
+
+	writel(value, up->port.membase + offset);
 }
 
 static int uniphier_of_serial_setup(struct device *dev, struct uart_port *port,
-- 
1.9.1

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