From: Andreas Färber <afaerber@suse.de>
Date: Mon, 8 Feb 2016 12:49:42 +0000 (+0100)
Subject: tty: serial: meson: Add support for XTAL clock input
X-Git-Tag: v4.14-rc1~3636^2~43
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=146f3808e08faabba46ea9574133a66aa4a9468d;p=platform%2Fkernel%2Flinux-rpi.git

tty: serial: meson: Add support for XTAL clock input

Fix the baudrate calculation for 24 MHz XTAL clock found on gxbb platforms.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index b12a37bd..024445a 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -78,6 +78,7 @@
 /* AML_UART_REG5 bits */
 #define AML_UART_BAUD_MASK		0x7fffff
 #define AML_UART_BAUD_USE		BIT(23)
+#define AML_UART_BAUD_XTAL		BIT(24)
 
 #define AML_UART_PORT_NUM		6
 #define AML_UART_DEV_NAME		"ttyAML"
@@ -299,7 +300,12 @@ static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
 
 	val = readl(port->membase + AML_UART_REG5);
 	val &= ~AML_UART_BAUD_MASK;
-	val = ((port->uartclk * 10 / (baud * 4) + 5) / 10) - 1;
+	if (port->uartclk == 24000000) {
+		val = ((port->uartclk / 3) / baud) - 1;
+		val |= AML_UART_BAUD_XTAL;
+	} else {
+		val = ((port->uartclk * 10 / (baud * 4) + 5) / 10) - 1;
+	}
 	val |= AML_UART_BAUD_USE;
 	writel(val, port->membase + AML_UART_REG5);
 }