diff options
Diffstat (limited to 'drivers/clk/clk-composite.c')
| -rw-r--r-- | drivers/clk/clk-composite.c | 79 |
1 files changed, 64 insertions, 15 deletions
diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c index 57a078e06efe..b9355daf8065 100644 --- a/drivers/clk/clk-composite.c +++ b/drivers/clk/clk-composite.c @@ -64,11 +64,56 @@ static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate, const struct clk_ops *mux_ops = composite->mux_ops; struct clk_hw *rate_hw = composite->rate_hw; struct clk_hw *mux_hw = composite->mux_hw; + struct clk *parent; + unsigned long parent_rate; + long tmp_rate, best_rate = 0; + unsigned long rate_diff; + unsigned long best_rate_diff = ULONG_MAX; + int i; if (rate_hw && rate_ops && rate_ops->determine_rate) { rate_hw->clk = hw->clk; return rate_ops->determine_rate(rate_hw, rate, best_parent_rate, best_parent_p); + } else if (rate_hw && rate_ops && rate_ops->round_rate && + mux_hw && mux_ops && mux_ops->set_parent) { + *best_parent_p = NULL; + + if (__clk_get_flags(hw->clk) & CLK_SET_RATE_NO_REPARENT) { + *best_parent_p = clk_get_parent(mux_hw->clk); + *best_parent_rate = __clk_get_rate(*best_parent_p); + + return rate_ops->round_rate(rate_hw, rate, + best_parent_rate); + } + + for (i = 0; i < __clk_get_num_parents(mux_hw->clk); i++) { + parent = clk_get_parent_by_index(mux_hw->clk, i); + if (!parent) + continue; + + parent_rate = __clk_get_rate(parent); + + tmp_rate = rate_ops->round_rate(rate_hw, rate, + &parent_rate); + if (tmp_rate < 0) + continue; + + rate_diff = abs(rate - tmp_rate); + + if (!rate_diff || !*best_parent_p + || best_rate_diff > rate_diff) { + *best_parent_p = parent; + *best_parent_rate = parent_rate; + best_rate_diff = rate_diff; + best_rate = tmp_rate; + } + + if (!rate_diff) + return rate; + } + + return best_rate; } else if (mux_hw && mux_ops && mux_ops->determine_rate) { mux_hw->clk = hw->clk; return mux_ops->determine_rate(mux_hw, rate, best_parent_rate, @@ -162,7 +207,7 @@ struct clk *clk_register_composite(struct device *dev, const char *name, clk_composite_ops = &composite->ops; if (mux_hw && mux_ops) { - if (!mux_ops->get_parent || !mux_ops->set_parent) { + if (!mux_ops->get_parent) { clk = ERR_PTR(-EINVAL); goto err; } @@ -170,7 +215,8 @@ struct clk *clk_register_composite(struct device *dev, const char *name, composite->mux_hw = mux_hw; composite->mux_ops = mux_ops; clk_composite_ops->get_parent = clk_composite_get_parent; - clk_composite_ops->set_parent = clk_composite_set_parent; + if (mux_ops->set_parent) + clk_composite_ops->set_parent = clk_composite_set_parent; if (mux_ops->determine_rate) clk_composite_ops->determine_rate = clk_composite_determine_rate; } @@ -180,24 +226,27 @@ struct clk *clk_register_composite(struct device *dev, const char *name, clk = ERR_PTR(-EINVAL); goto err; } + clk_composite_ops->recalc_rate = clk_composite_recalc_rate; - /* .round_rate is a prerequisite for .set_rate */ - if (rate_ops->round_rate) { - clk_composite_ops->round_rate = clk_composite_round_rate; - if (rate_ops->set_rate) { - clk_composite_ops->set_rate = clk_composite_set_rate; - } - } else { - WARN(rate_ops->set_rate, - "%s: missing round_rate op is required\n", - __func__); + if (rate_ops->determine_rate) + clk_composite_ops->determine_rate = + clk_composite_determine_rate; + else if (rate_ops->round_rate) + clk_composite_ops->round_rate = + clk_composite_round_rate; + + /* .set_rate requires either .round_rate or .determine_rate */ + if (rate_ops->set_rate) { + if (rate_ops->determine_rate || rate_ops->round_rate) + clk_composite_ops->set_rate = + clk_composite_set_rate; + else + WARN(1, "%s: missing round_rate op is required\n", + __func__); } composite->rate_hw = rate_hw; composite->rate_ops = rate_ops; - clk_composite_ops->recalc_rate = clk_composite_recalc_rate; - if (rate_ops->determine_rate) - clk_composite_ops->determine_rate = clk_composite_determine_rate; } if (gate_hw && gate_ops) { |
