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clk: honor CLK_MUX_ROUND_CLOSEST in generic clk mux

Browse source 
CLK_MUX_ROUND_CLOSEST is part of the clk_mux documentation but clk_mux
directly calls __clk_mux_determine_rate(), which overrides the flag.
As result, if clk_mux is instantiated with CLK_MUX_ROUND_CLOSEST, the
flag will be ignored and the clock rounded down.

To solve this, this patch expose clk_mux_determine_rate_flags() in the
clk-provider API and uses it in the determine_rate() callback of clk_mux.

Fixes: 15a02c1f6d ("clk: Add __clk_mux_determine_rate_closest")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Jerome Brunet 2018-04-09 15:59:20 +02:00 • committed by Stephen Boyd
parent a21b85944c
commit 4ad69b80e8
3 changed files with 16 additions and 4 deletions
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10
drivers/clk/clk-mux.c
View file

@ -112,10 +112,18 @@ static int clk_mux_set_parent(struct clk_hw *hw, u8 index)
return 0;
}
static int clk_mux_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct clk_mux *mux = to_clk_mux(hw);
return clk_mux_determine_rate_flags(hw, req, mux->flags);
}
const struct clk_ops clk_mux_ops = {
.get_parent = clk_mux_get_parent,
.set_parent = clk_mux_set_parent,
.determine_rate = __clk_mux_determine_rate,
.determine_rate = clk_mux_determine_rate,
};
EXPORT_SYMBOL_GPL(clk_mux_ops);

7
drivers/clk/clk.c
View file

@ -426,9 +426,9 @@ static bool mux_is_better_rate(unsigned long rate, unsigned long now,
return now <= rate && now > best;
}
static int
clk_mux_determine_rate_flags(struct clk_hw *hw, struct clk_rate_request *req,
unsigned long flags)
int clk_mux_determine_rate_flags(struct clk_hw *hw,
struct clk_rate_request *req,
unsigned long flags)
{
struct clk_core *core = hw->core, *parent, *best_parent = NULL;
int i, num_parents, ret;
@ -488,6 +488,7 @@ out:
return 0;
}
EXPORT_SYMBOL_GPL(clk_mux_determine_rate_flags);
struct clk *__clk_lookup(const char *name)
{

3
include/linux/clk-provider.h
View file

@ -765,6 +765,9 @@ int __clk_mux_determine_rate(struct clk_hw *hw,
int __clk_determine_rate(struct clk_hw *core, struct clk_rate_request *req);
int __clk_mux_determine_rate_closest(struct clk_hw *hw,
struct clk_rate_request *req);
int clk_mux_determine_rate_flags(struct clk_hw *hw,
struct clk_rate_request *req,
unsigned long flags);
void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);
void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,
unsigned long max_rate);