clk: sunxi: Fix incorrect usage of round_down()

[ Upstream commit ee25d9742dabed3fd18158b518f846abeb70f319 ]

round_down() can only round to powers of 2. If round_down() is asked
to round to something that is not a power of 2, incorrect results are
produced. The incorrect results can be both too large and too small.

Instead, use rounddown() which can round to any number.

Fixes: 6a721db180a2 ("clk: sunxi: Add A31 clocks support")
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 9c79af0c03b2115a422f49414e9b431ed0d8ab36..2cec9e83831fd86033389662d84da8ddd83fa2c3 100644 (file)
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -311,7 +311,7 @@ static void sun6i_a31_get_pll1_factors(u32 *freq, u32 parent_rate,
         * Round down the frequency to the closest multiple of either
         * 6 or 16
         */
-       u32 round_freq_6 = round_down(freq_mhz, 6);
+       u32 round_freq_6 = rounddown(freq_mhz, 6);
        u32 round_freq_16 = round_down(freq_mhz, 16);
 
        if (round_freq_6 > round_freq_16)