Fix the baudrate calculation for 24 MHz XTAL clock found on gxbb platforms.
Signed-off-by: Andreas Färber <afaerber@xxxxxxx>
---
Forward-ported from vendor kernel. On top of my meson earlycon patch.
drivers/tty/serial/meson_uart.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 9efcfa2de31e..4415631bab17 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);
}
--
2.6.2
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