clk: clk_stm32f: Fix stm32_clk_get_rate()

Wrong parameter was passed to stm32_clk_pll48clk_rate().
sysclk (PLL_p output value) was passed instead of VCO value.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

diff --git a/drivers/clk/clk_stm32f.c b/drivers/clk/clk_stm32f.c
index f1f0299..41d8b5e 100644 (file)
--- a/drivers/clk/clk_stm32f.c
+++ b/drivers/clk/clk_stm32f.c
@@ -230,7 +230,7 @@ static int configure_clocks(struct udevice *dev)
 }
 
 static unsigned long stm32_clk_pll48clk_rate(struct stm32_clk *priv,
-                                            u32 sysclk)
+                                            u32 vco)
 {
        struct stm32_rcc_regs *regs = priv->base;
        u16 pllq, pllm, pllsain, pllsaip;
@@ -254,7 +254,7 @@ static unsigned long stm32_clk_pll48clk_rate(struct stm32_clk *priv,
                return ((priv->hse_rate / pllm) * pllsain) / pllsaip;
        }
        /* PLL48CLK is selected from PLLQ */
-       return sysclk / pllq;
+       return vco / pllq;
 }
 
 static bool stm32_get_timpre(struct stm32_clk *priv)
@@ -337,6 +337,7 @@ static ulong stm32_clk_get_rate(struct clk *clk)
        struct stm32_clk *priv = dev_get_priv(clk->dev);
        struct stm32_rcc_regs *regs = priv->base;
        u32 sysclk = 0;
+       u32 vco;
        u16 pllm, plln, pllp;
 
        if ((readl(&regs->cfgr) & RCC_CFGR_SWS_MASK) ==
@@ -346,7 +347,8 @@ static ulong stm32_clk_get_rate(struct clk *clk)
                        >> RCC_PLLCFGR_PLLN_SHIFT);
                pllp = ((((readl(&regs->pllcfgr) & RCC_PLLCFGR_PLLP_MASK)
                        >> RCC_PLLCFGR_PLLP_SHIFT) + 1) << 1);
-               sysclk = ((priv->hse_rate / pllm) * plln) / pllp;
+               vco = (priv->hse_rate / pllm) * plln;
+               sysclk = vco / pllp;
        } else {
                return -EINVAL;
        }
@@ -388,14 +390,14 @@ static ulong stm32_clk_get_rate(struct clk *clk)
                                /* System clock is selected as SDMMC1 clock */
                                return sysclk;
                        else
-                               return stm32_clk_pll48clk_rate(priv, sysclk);
+                               return stm32_clk_pll48clk_rate(priv, vco);
                        break;
                case STM32F7_APB2_CLOCK(SDMMC2):
                        if (readl(&regs->dckcfgr2) & RCC_DCKCFGR2_SDMMC2SEL)
                                /* System clock is selected as SDMMC2 clock */
                                return sysclk;
                        else
-                               return stm32_clk_pll48clk_rate(priv, sysclk);
+                               return stm32_clk_pll48clk_rate(priv, vco);
                        break;
 
                /* For timer clock, an additionnal prescaler is used*/