From: Barry Song <Baohua.Song@xxxxxxx>
The fast lookup table to set baudrate is only right when ioclk
is 150MHz. for most platforms, ioclk is 150MHz, but some boards
might set ioclk to other frequency.
so re-calc the clk_div_reg when ioclk is not 150MHz.
Signed-off-by: Barry Song <Baohua.Song@xxxxxxx>
---
drivers/tty/serial/sirfsoc_uart.c | 18 +++++++++++++-----
1 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 142217c..fe28b1f 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -375,7 +375,12 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
int threshold_div;
int temp;
- ioclk_rate = 150000000;
+ struct clk *clk = clk_get_sys("io", NULL);
+ BUG_ON(IS_ERR(clk));
+
+ ioclk_rate = clk_get_rate(clk);
+ clk_put(clk);
+
switch (termios->c_cflag & CSIZE) {
default:
case CS8:
@@ -431,10 +436,13 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
sirfsoc_uart_disable_ms(port);
}
- /* common rate: fast calculation */
- for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
- if (baud_rate == baudrate_to_regv[ic].baud_rate)
- clk_div_reg = baudrate_to_regv[ic].reg_val;
+ if (ioclk_rate == 150000000) {
+ /* common rate: fast calculation */
+ for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
+ if (baud_rate == baudrate_to_regv[ic].baud_rate)
+ clk_div_reg = baudrate_to_regv[ic].reg_val;
+ }
+
setted_baud = baud_rate;
/* arbitary rate setting */
if (unlikely(clk_div_reg == 0))
--
1.7.5.4
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