1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 2ce22447d76e..945405fee1ab 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -150,6 +150,7 @@ static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
         struct clk_divider *divider = to_clk_divider(hw);
         int i, bestdiv = 0;
         unsigned long parent_rate, best = 0, now, maxdiv;
+        unsigned long parent_rate_saved = *best_parent_rate;
 
         if (!rate)
                 rate = 1;
@@ -173,6 +174,15 @@ static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
         for (i = 1; i <= maxdiv; i++) {
                 if (!_is_valid_div(divider, i))
                         continue;
+                if (rate * i == parent_rate_saved) {
+                        /*
+                         * It's the most ideal case if the requested rate can be
+                         * divided from parent clock without needing to change
+                         * parent rate, so return the divider immediately.
+                         */
+                        *best_parent_rate = parent_rate_saved;
+                        return i;
+                }
                 parent_rate = __clk_round_rate(__clk_get_parent(hw->clk),
                                 MULT_ROUND_UP(rate, i));
                 now = parent_rate / i;