From: Dien Pham <[email protected]> The calculation value has some errors after some calculation, especially, when one of the input value is odd value. This patch applies rounding to closest frequency at 100Mhz unit.
Signed-off-by: Dien Pham <[email protected]> Signed-off-by: Takeshi Kihara <[email protected]> Signed-off-by: Yoshihiro Kaneko <[email protected]> --- drivers/clk/renesas/clk-rcar-gen2.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/clk/renesas/clk-rcar-gen2.c b/drivers/clk/renesas/clk-rcar-gen2.c index 7519f71..5c4dcc7 100644 --- a/drivers/clk/renesas/clk-rcar-gen2.c +++ b/drivers/clk/renesas/clk-rcar-gen2.c @@ -60,13 +60,16 @@ static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw, struct cpg_z_clk *zclk = to_z_clk(hw); unsigned int mult; unsigned int val; + unsigned long rate; val = (clk_readl(zclk->reg) & CPG_FRQCRC_ZFC_MASK) >> CPG_FRQCRC_ZFC_SHIFT; mult = 32 - val; - /* Add 1/2 to reduce the math error that raises by math rounding */ - return div_u64((u64)parent_rate * mult + 16, 32); + rate = div_u64((u64)parent_rate * mult + 16, 32); + /* Round to closest value at 100MHz unit */ + rate = 100000000 * DIV_ROUND_CLOSEST(rate, 100000000); + return rate; } static long cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long rate, -- 1.9.1
