diff options
| author | Andreas Färber <afaerber@suse.de> | 2016-02-08 15:49:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-15 04:39:36 +0300 |
| commit | 146f3808e08faabba46ea9574133a66aa4a9468d (patch) | |
| tree | 3e55c7fe128bed33568dc971b90bc3bbf6fcbe09 /drivers/tty/serial/meson_uart.c | |
| parent | df247081afc0dbd57472d653c587210c511f6931 (diff) | |
| download | linux-146f3808e08faabba46ea9574133a66aa4a9468d.tar.xz | |
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>
Diffstat (limited to 'drivers/tty/serial/meson_uart.c')
| -rw-r--r-- | drivers/tty/serial/meson_uart.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index b12a37bd37b6..024445aa0521 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); } |