clk: divider: Add round to closest divider

In some cases, we want to be able to round the divider to the closest one,
instead than rounding up.

This patch adds a new CLK_DIVIDER_ROUND_CLOSEST flag to specify the divider
has to round to closest div, keeping rounding up as de default behaviour.

Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 4637697..c572945 100644 (file)
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -43,6 +43,17 @@ static unsigned int _get_table_maxdiv(const struct clk_div_table *table)
        return maxdiv;
 }
 
+static unsigned int _get_table_mindiv(const struct clk_div_table *table)
+{
+       unsigned int mindiv = UINT_MAX;
+       const struct clk_div_table *clkt;
+
+       for (clkt = table; clkt->div; clkt++)
+               if (clkt->div < mindiv)
+                       mindiv = clkt->div;
+       return mindiv;
+}
+
 static unsigned int _get_maxdiv(struct clk_divider *divider)
 {
        if (divider->flags & CLK_DIVIDER_ONE_BASED)
@@ -162,6 +173,24 @@ static int _round_up_table(const struct clk_div_table *table, int div)
        return up;
 }
 
+static int _round_down_table(const struct clk_div_table *table, int div)
+{
+       const struct clk_div_table *clkt;
+       int down = _get_table_mindiv(table);
+
+       for (clkt = table; clkt->div; clkt++) {
+               if (clkt->div == div)
+                       return clkt->div;
+               else if (clkt->div > div)
+                       continue;
+
+               if ((div - clkt->div) < (div - down))
+                       down = clkt->div;
+       }
+
+       return down;
+}
+
 static int _div_round_up(struct clk_divider *divider,
                unsigned long parent_rate, unsigned long rate)
 {
@@ -175,6 +204,42 @@ static int _div_round_up(struct clk_divider *divider,
        return div;
 }
 
+static int _div_round_closest(struct clk_divider *divider,
+               unsigned long parent_rate, unsigned long rate)
+{
+       int up, down, div;
+
+       up = down = div = DIV_ROUND_CLOSEST(parent_rate, rate);
+
+       if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) {
+               up = __roundup_pow_of_two(div);
+               down = __rounddown_pow_of_two(div);
+       } else if (divider->table) {
+               up = _round_up_table(divider->table, div);
+               down = _round_down_table(divider->table, div);
+       }
+
+       return (up - div) <= (div - down) ? up : down;
+}
+
+static int _div_round(struct clk_divider *divider, unsigned long parent_rate,
+               unsigned long rate)
+{
+       if (divider->flags & CLK_DIVIDER_ROUND_CLOSEST)
+               return _div_round_closest(divider, parent_rate, rate);
+
+       return _div_round_up(divider, parent_rate, rate);
+}
+
+static bool _is_best_div(struct clk_divider *divider,
+               int rate, int now, int best)
+{
+       if (divider->flags & CLK_DIVIDER_ROUND_CLOSEST)
+               return abs(rate - now) < abs(rate - best);
+
+       return now <= rate && now > best;
+}
+
 static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
                unsigned long *best_parent_rate)
 {
@@ -190,7 +255,7 @@ static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
 
        if (!(__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT)) {
                parent_rate = *best_parent_rate;
-               bestdiv = _div_round_up(divider, parent_rate, rate);
+               bestdiv = _div_round(divider, parent_rate, rate);
                bestdiv = bestdiv == 0 ? 1 : bestdiv;
                bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv;
                return bestdiv;
@@ -217,7 +282,7 @@ static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
                parent_rate = __clk_round_rate(__clk_get_parent(hw->clk),
                                MULT_ROUND_UP(rate, i));
                now = DIV_ROUND_UP(parent_rate, i);
-               if (now <= rate && now > best) {
+               if (_is_best_div(divider, rate, now, best)) {
                        bestdiv = i;
                        best = now;
                        *best_parent_rate = parent_rate;

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 5119174..59e2eb5 100644 (file)
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -312,6 +312,8 @@ struct clk_div_table {
  *   of this register, and mask of divider bits are in higher 16-bit of this
  *   register.  While setting the divider bits, higher 16-bit should also be
  *   updated to indicate changing divider bits.
+ * CLK_DIVIDER_ROUND_CLOSEST - Makes the best calculated divider to be rounded
+ *     to the closest integer instead of the up one.
  */
 struct clk_divider {
        struct clk_hw   hw;
@@ -327,6 +329,7 @@ struct clk_divider {
 #define CLK_DIVIDER_POWER_OF_TWO       BIT(1)
 #define CLK_DIVIDER_ALLOW_ZERO         BIT(2)
 #define CLK_DIVIDER_HIWORD_MASK                BIT(3)
+#define CLK_DIVIDER_ROUND_CLOSEST      BIT(4)
 
 extern const struct clk_ops clk_divider_ops;
 struct clk *clk_register_divider(struct device *dev, const char *name,