clk: imx: clk-fracn-gppll: Return rate in rate table properly in ->recalc_rate()

The PLL parameters in rate table should be directly compared with
those read from PLL registers instead of the cooked ones.

Fixes: 1b26cb8 ("clk: imx: support fracn gppll")
Cc: Abel Vesa <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Pengutronix Kernel Team <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: NXP Linux Team <[email protected]>
Cc: Peng Fan <[email protected]>
Signed-off-by: Liu Ying <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Reviewed-by: Abel Vesa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Abel Vesa <[email protected]>

Author: Liu Ying

drivers/clk/imx/clk-fracn-gppll.c

@@ -131,18 +131,7 @@ static unsigned long clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon
 	mfi = FIELD_GET(PLL_MFI_MASK, pll_div);
 
 	rdiv = FIELD_GET(PLL_RDIV_MASK, pll_div);
-	rdiv = rdiv + 1;
 	odiv = FIELD_GET(PLL_ODIV_MASK, pll_div);
-	switch (odiv) {
-	case 0:
-		odiv = 2;
-		break;
-	case 1:
-		odiv = 3;
-		break;
-	default:
-		break;
-	}
 
 	/*
 	 * Sometimes, the recalculated rate has deviation due to
@@ -160,6 +149,19 @@ static unsigned long clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon
 	if (rate)
 		return (unsigned long)rate;
 
+	rdiv = rdiv + 1;
+
+	switch (odiv) {
+	case 0:
+		odiv = 2;
+		break;
+	case 1:
+		odiv = 3;
+		break;
+	default:
+		break;
+	}
+
 	/* Fvco = Fref * (MFI + MFN / MFD) */
 	fvco = fvco * mfi * mfd + fvco * mfn;
 	do_div(fvco, mfd * rdiv * odiv);