[PATCH 2/2] serial: a37xx: Do not call get_ref_clk() in _debug_uart_init()

Pali Rohár
2021-07-26T12:59:37Z

Static inline function _debug_uart_init() should avoid calling external
(non-inline) functions. Therefore do not call get_ref_clk() in
_debug_uart_init() and reimplement its functionality without external
function calls.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
drivers/serial/serial_mvebu_a3700.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/serial/serial_mvebu_a3700.c b/drivers/serial/serial_mvebu_a3700.c
index 52dc3fdad7b4..6bca8e4b7e2d 100644
--- a/drivers/serial/serial_mvebu_a3700.c
+++ b/drivers/serial/serial_mvebu_a3700.c
@@ -305,6 +305,7 @@ U_BOOT_DRIVER(serial_mvebu) = {
#ifdef CONFIG_DEBUG_MVEBU_A3700_UART

#include <debug_uart.h>
+#include <mach/soc.h>

static inline void _debug_uart_init(void)
{
@@ -322,7 +323,8 @@ static inline void _debug_uart_init(void)
* Calculate divider
* baudrate = clock / 16 / divider
*/
- parent_rate = get_ref_clk() * 1000000;
+ parent_rate = (readl(MVEBU_REGISTER(0x13808)) & BIT(9)) ?
+ 40000000 : 25000000;
divider = DIV_ROUND_CLOSEST(parent_rate, CONFIG_BAUDRATE * 16);
writel(divider, base + UART_BAUD_REG);

--
2.20.1