From: Dinh Nguyen dinguyen@kernel.org
[ Upstream commit cc26ed7be46c5f5fa45f3df8161ed7ca3c4d318c ]
do_div() macro to perform u64 division and guards against overflow if the result is too large for the unsigned long return type.
Signed-off-by: Dinh Nguyen dinguyen@kernel.org Link: https://lkml.kernel.org/r/20200114160726.19771-1-dinguyen@kernel.org Signed-off-by: Stephen Boyd sboyd@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/clk/socfpga/clk-pll-s10.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/socfpga/clk-pll-s10.c b/drivers/clk/socfpga/clk-pll-s10.c index c4d0b6f6abf2e..fc2e2839fe570 100644 --- a/drivers/clk/socfpga/clk-pll-s10.c +++ b/drivers/clk/socfpga/clk-pll-s10.c @@ -38,7 +38,9 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk, /* read VCO1 reg for numerator and denominator */ reg = readl(socfpgaclk->hw.reg); refdiv = (reg & SOCFPGA_PLL_REFDIV_MASK) >> SOCFPGA_PLL_REFDIV_SHIFT; - vco_freq = (unsigned long long)parent_rate / refdiv; + + vco_freq = parent_rate; + do_div(vco_freq, refdiv);
/* Read mdiv and fdiv from the fdbck register */ reg = readl(socfpgaclk->hw.reg + 0x4);