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clk: add flag for clocks that need to be enabled on rate changes

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Some clocks need to be enabled to accept rate changes. This patch adds a
new flag CLK_SET_RATE_UNGATE that lets clk_change_rate enable the clock
before trying to change the rate and disable it again afterwards.
This of course doesn't effect clocks that are already running at that
point, as their refcount will only temporarily increase.

Signed-off-by: Heiko Stuebner <[email protected]>
Tested-by: Sjoerd Simons <[email protected]>
Reviewed-by: Sjoerd Simons <[email protected]>
Signed-off-by: Michael Turquette <[email protected]>
This commit is contained in:
Heiko Stuebner 2015-12-22 22:27:58 +01:00 • committed by Michael Turquette
commit 2eb8c7104c
2 changed files with 19 additions and 0 deletions
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18
drivers/clk/clk.c
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@ -1443,6 +1443,15 @@ static void clk_change_rate(struct clk_core *core)
else if (core->parent)
best_parent_rate = core->parent->rate;
if (core->flags & CLK_SET_RATE_UNGATE) {
unsigned long flags;
clk_core_prepare(core);
flags = clk_enable_lock();
clk_core_enable(core);
clk_enable_unlock(flags);
}
if (core->new_parent && core->new_parent != core->parent) {
old_parent = __clk_set_parent_before(core, core->new_parent);
trace_clk_set_parent(core, core->new_parent);
@ -1469,6 +1478,15 @@ static void clk_change_rate(struct clk_core *core)
core->rate = clk_recalc(core, best_parent_rate);
if (core->flags & CLK_SET_RATE_UNGATE) {
unsigned long flags;
flags = clk_enable_lock();
clk_core_disable(core);
clk_enable_unlock(flags);
clk_core_unprepare(core);
}
if (core->notifier_count && old_rate != core->rate)
__clk_notify(core, POST_RATE_CHANGE, old_rate, core->rate);