--- zzzz-none-000/linux-3.10.107/drivers/clk/mmp/clk-frac.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/clk/mmp/clk-frac.c	2021-02-04 17:41:59.000000000 +0000
@@ -22,40 +22,37 @@
  * numerator/denominator = Fin / (Fout * factor)
  */
 
-#define to_clk_factor(hw) container_of(hw, struct clk_factor, hw)
-struct clk_factor {
-	struct clk_hw		hw;
-	void __iomem		*base;
-	struct clk_factor_masks	*masks;
-	struct clk_factor_tbl	*ftbl;
-	unsigned int		ftbl_cnt;
-};
+#define to_clk_factor(hw) container_of(hw, struct mmp_clk_factor, hw)
 
 static long clk_factor_round_rate(struct clk_hw *hw, unsigned long drate,
 		unsigned long *prate)
 {
-	struct clk_factor *factor = to_clk_factor(hw);
+	struct mmp_clk_factor *factor = to_clk_factor(hw);
 	unsigned long rate = 0, prev_rate;
 	int i;
 
 	for (i = 0; i < factor->ftbl_cnt; i++) {
 		prev_rate = rate;
-		rate = (((*prate / 10000) * factor->ftbl[i].num) /
-			(factor->ftbl[i].den * factor->masks->factor)) * 10000;
+		rate = (((*prate / 10000) * factor->ftbl[i].den) /
+			(factor->ftbl[i].num * factor->masks->factor)) * 10000;
 		if (rate > drate)
 			break;
 	}
-	if (i == 0)
+	if ((i == 0) || (i == factor->ftbl_cnt)) {
 		return rate;
-	else
-		return prev_rate;
+	} else {
+		if ((drate - prev_rate) > (rate - drate))
+			return rate;
+		else
+			return prev_rate;
+	}
 }
 
 static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
 		unsigned long parent_rate)
 {
-	struct clk_factor *factor = to_clk_factor(hw);
-	struct clk_factor_masks *masks = factor->masks;
+	struct mmp_clk_factor *factor = to_clk_factor(hw);
+	struct mmp_clk_factor_masks *masks = factor->masks;
 	unsigned int val, num, den;
 
 	val = readl_relaxed(factor->base);
@@ -64,7 +61,7 @@
 	num = (val >> masks->num_shift) & masks->num_mask;
 
 	/* calculate denominator */
-	den = (val >> masks->den_shift) & masks->num_mask;
+	den = (val >> masks->den_shift) & masks->den_mask;
 
 	if (!den)
 		return 0;
@@ -77,22 +74,26 @@
 static int clk_factor_set_rate(struct clk_hw *hw, unsigned long drate,
 				unsigned long prate)
 {
-	struct clk_factor *factor = to_clk_factor(hw);
-	struct clk_factor_masks *masks = factor->masks;
+	struct mmp_clk_factor *factor = to_clk_factor(hw);
+	struct mmp_clk_factor_masks *masks = factor->masks;
 	int i;
 	unsigned long val;
 	unsigned long prev_rate, rate = 0;
+	unsigned long flags = 0;
 
 	for (i = 0; i < factor->ftbl_cnt; i++) {
 		prev_rate = rate;
-		rate = (((prate / 10000) * factor->ftbl[i].num) /
-			(factor->ftbl[i].den * factor->masks->factor)) * 10000;
+		rate = (((prate / 10000) * factor->ftbl[i].den) /
+			(factor->ftbl[i].num * factor->masks->factor)) * 10000;
 		if (rate > drate)
 			break;
 	}
 	if (i > 0)
 		i--;
 
+	if (factor->lock)
+		spin_lock_irqsave(factor->lock, flags);
+
 	val = readl_relaxed(factor->base);
 
 	val &= ~(masks->num_mask << masks->num_shift);
@@ -103,21 +104,65 @@
 
 	writel_relaxed(val, factor->base);
 
+	if (factor->lock)
+		spin_unlock_irqrestore(factor->lock, flags);
+
 	return 0;
 }
 
+static void clk_factor_init(struct clk_hw *hw)
+{
+	struct mmp_clk_factor *factor = to_clk_factor(hw);
+	struct mmp_clk_factor_masks *masks = factor->masks;
+	u32 val, num, den;
+	int i;
+	unsigned long flags = 0;
+
+	if (factor->lock)
+		spin_lock_irqsave(factor->lock, flags);
+
+	val = readl(factor->base);
+
+	/* calculate numerator */
+	num = (val >> masks->num_shift) & masks->num_mask;
+
+	/* calculate denominator */
+	den = (val >> masks->den_shift) & masks->den_mask;
+
+	for (i = 0; i < factor->ftbl_cnt; i++)
+		if (den == factor->ftbl[i].den && num == factor->ftbl[i].num)
+			break;
+
+	if (i >= factor->ftbl_cnt) {
+		val &= ~(masks->num_mask << masks->num_shift);
+		val |= (factor->ftbl[0].num & masks->num_mask) <<
+			masks->num_shift;
+
+		val &= ~(masks->den_mask << masks->den_shift);
+		val |= (factor->ftbl[0].den & masks->den_mask) <<
+			masks->den_shift;
+
+		writel(val, factor->base);
+	}
+
+	if (factor->lock)
+		spin_unlock_irqrestore(factor->lock, flags);
+}
+
 static struct clk_ops clk_factor_ops = {
 	.recalc_rate = clk_factor_recalc_rate,
 	.round_rate = clk_factor_round_rate,
 	.set_rate = clk_factor_set_rate,
+	.init = clk_factor_init,
 };
 
 struct clk *mmp_clk_register_factor(const char *name, const char *parent_name,
 		unsigned long flags, void __iomem *base,
-		struct clk_factor_masks *masks, struct clk_factor_tbl *ftbl,
-		unsigned int ftbl_cnt)
+		struct mmp_clk_factor_masks *masks,
+		struct mmp_clk_factor_tbl *ftbl,
+		unsigned int ftbl_cnt, spinlock_t *lock)
 {
-	struct clk_factor *factor;
+	struct mmp_clk_factor *factor;
 	struct clk_init_data init;
 	struct clk *clk;
 
@@ -138,6 +183,7 @@
 	factor->ftbl = ftbl;
 	factor->ftbl_cnt = ftbl_cnt;
 	factor->hw.init = &init;
+	factor->lock = lock;
 
 	init.name = name;
 	init.ops = &clk_factor_ops;