clk: socfpga: stratix10: fix rate calculation for pll clocks

commit c0a636e4cc2eb39244d23c0417c117be4c96a7fe upstream.

The main PLL calculation has a mistake. We should be using the
multiplying the VCO frequency, not the parent clock frequency.

Fixes: 07afb8db7340 ("clk: socfpga: stratix10: add clock driver for
Stratix10 platform")
Cc: linux-stable@vger.kernel.org
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/clk/socfpga/clk-pll-s10.c b/drivers/clk/socfpga/clk-pll-s10.c
index 2d5d8b4..c4d0b6f 100644 (file)
--- a/drivers/clk/socfpga/clk-pll-s10.c
+++ b/drivers/clk/socfpga/clk-pll-s10.c
@@ -43,7 +43,7 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
        /* Read mdiv and fdiv from the fdbck register */
        reg = readl(socfpgaclk->hw.reg + 0x4);
        mdiv = (reg & SOCFPGA_PLL_MDIV_MASK) >> SOCFPGA_PLL_MDIV_SHIFT;
-       vco_freq = (unsigned long long)parent_rate * (mdiv + 6);
+       vco_freq = (unsigned long long)vco_freq * (mdiv + 6);
 
        return (unsigned long)vco_freq;
 }