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serial: 8250_dw: don't set clk when clk is null for rockchip

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Fixes: b205560ab1 ("serial: 8250_dw: set uart clk according to baudrate")
Change-Id: I89593824840b2d1c3f5671f46cd92ddea5929d46
Signed-off-by: Tony Xie <tony.xie@rock-chips.com>
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
This commit is contained in:
Tony Xie
2022-03-17 11:18:00 +08:00
committed by Tao Huang
parent 9622c8cd5a
commit 85adeb4f55
1 changed files with 28 additions and 26 deletions
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54
drivers/tty/serial/8250/8250_dw.c
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@@ -349,35 +349,37 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
clk_disable_unprepare(d->clk);
#ifdef CONFIG_ARCH_ROCKCHIP
if (baud <= 115200)
rate = 24000000;
else if (baud == 230400)
rate = baud * 16 * 2;
else if (baud == 1152000)
rate = baud * 16 * 2;
else
rate = baud * 16;
if (d->clk) {
if (baud <= 115200)
rate = 24000000;
else if (baud == 230400)
rate = baud * 16 * 2;
else if (baud == 1152000)
rate = baud * 16 * 2;
else
rate = baud * 16;
ret = clk_set_rate(d->clk, rate);
rate_temp = clk_get_rate(d->clk);
diff = rate * 20 / 1000;
/*
* If rate_temp is not equal to rate, is means fractional frequency
* division is failed. Then use Integer frequency division, and
* the baud rate error must be under -+2%
*/
if ((rate_temp < rate) && ((rate - rate_temp) > diff)) {
ret = clk_set_rate(d->clk, rate + diff);
ret = clk_set_rate(d->clk, rate);
rate_temp = clk_get_rate(d->clk);
if ((rate_temp < rate) && ((rate - rate_temp) > diff))
dev_info(p->dev, "set rate:%ld, but get rate:%d\n",
rate, rate_temp);
else if ((rate < rate_temp) && ((rate_temp - rate) > diff))
dev_info(p->dev, "set rate:%ld, but get rate:%d\n",
rate, rate_temp);
diff = rate * 20 / 1000;
/*
* If rate_temp is not equal to rate, is means fractional frequency
* division is failed. Then use Integer frequency division, and
* the baud rate error must be under -+2%
*/
if ((rate_temp < rate) && ((rate - rate_temp) > diff)) {
ret = clk_set_rate(d->clk, rate + diff);
rate_temp = clk_get_rate(d->clk);
if ((rate_temp < rate) && ((rate - rate_temp) > diff))
dev_info(p->dev, "set rate:%ld, but get rate:%d\n",
rate, rate_temp);
else if ((rate < rate_temp) && ((rate_temp - rate) > diff))
dev_info(p->dev, "set rate:%ld, but get rate:%d\n",
rate, rate_temp);
}
if (!ret)
p->uartclk = rate;
}
if (!ret)
p->uartclk = rate;
#else
rate = clk_round_rate(d->clk, newrate);
if (rate > 0) {