clk: Unprepare the unused prepared slow clocks at late init (1c155b3d) · Commits · 戴 / test

The unused ungated fast clocks are already being disabled from clk_disable_unused at late init. This patch extend this sequence to the slow unused prepared clocks to be unprepared. Unless the optional .is_prepared callback is implemented by a clk_hw the clk_disable_unused sequence will not unprepare any unused clocks, since it will fall back to use the software prepare counter. Signed-off-by:

Ulf Hansson <ulf.hansson@linaro.org> Acked-by:

Linus Walleij <linus.walleij@linaro.org> Signed-off-by:

Mike Turquette <mturquette@linaro.org> [mturquette@linaro.org: fixed hlist accessors per ]

drivers/clk/clk.c

+28 −0

Original line number	Diff line number	Diff line
		@@ -335,6 +335,28 @@ late_initcall(clk_debug_init);
		static inline int clk_debug_register(struct clk *clk) { return 0; }
		#endif

		/* caller must hold prepare_lock */
		static void clk_unprepare_unused_subtree(struct clk *clk)
		{
		struct clk *child;

		if (!clk)
		return;

		hlist_for_each_entry(child, &clk->children, child_node)
		clk_unprepare_unused_subtree(child);

		if (clk->prepare_count)
		return;

		if (clk->flags & CLK_IGNORE_UNUSED)
		return;

		if (__clk_is_prepared(clk))
		if (clk->ops->unprepare)
		clk->ops->unprepare(clk->hw);
		}

		/* caller must hold prepare_lock */
		static void clk_disable_unused_subtree(struct clk *clk)
		{
		@@ -386,6 +408,12 @@ static int clk_disable_unused(void)
		hlist_for_each_entry(clk, &clk_orphan_list, child_node)
		clk_disable_unused_subtree(clk);

		hlist_for_each_entry(clk, &clk_root_list, child_node)
		clk_unprepare_unused_subtree(clk);

		hlist_for_each_entry(clk, &clk_orphan_list, child_node)
		clk_unprepare_unused_subtree(clk);

		mutex_unlock(&prepare_lock);

		return 0;

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