Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 146f3808 authored by Andreas Färber's avatar Andreas Färber Committed by Greg Kroah-Hartman
Browse files

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: default avatarAndreas Färber <afaerber@suse.de>
Acked-by: default avatarCarlo Caione <carlo@endlessm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent df247081

drivers/tty/serial/meson_uart.c

+7 −1
Original line number Diff line number Diff line
@@ -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;

	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);

}