clk: sunxi-ng: mux: Fix determine_rate for mux clocks with pre-dividers

The determine_rate helper used ccu_mux_helper_adjust_parent_for_prediv()
to adjust the parent_rate to account for pre-dividers, but then passed
the pristine parent clock rate from clk_hw_get_rate() to the round()
callback, thereby ignoring the pre-divider adjustment. In addition,
it was saving the adjusted parent rate back into struct
clk_rate_request.

This patch fixes this by saving the pristine parent clock rate, and
adding a copy that is adjusted and passed to the round() callback.
The pristine copy, if it is the best solution, would be saved back
to struct clk_rate_request.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index 858a486..eb66adb 100644 (file)
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -71,7 +71,7 @@ int ccu_mux_helper_determine_rate(struct ccu_common *common,
        unsigned int i;
 
        for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
-               unsigned long tmp_rate, parent_rate;
+               unsigned long tmp_rate, parent_rate, adj_parent_rate;
                struct clk_hw *parent;
 
                parent = clk_hw_get_parent_by_index(hw, i);
@@ -79,10 +79,11 @@ int ccu_mux_helper_determine_rate(struct ccu_common *common,
                        continue;
 
                parent_rate = clk_hw_get_rate(parent);
+               adj_parent_rate = parent_rate;
                ccu_mux_helper_adjust_parent_for_prediv(common, cm, i,
-                                                       &parent_rate);
+                                                       &adj_parent_rate);
 
-               tmp_rate = round(cm, clk_hw_get_rate(parent), req->rate, data);
+               tmp_rate = round(cm, adj_parent_rate, req->rate, data);
                if (tmp_rate == req->rate) {
                        best_parent = parent;
                        best_parent_rate = parent_rate;