diff options
author | Ulf Hansson <ulf.hansson@linaro.org> | 2013-03-12 19:26:03 (GMT) |
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committer | Mike Turquette <mturquette@linaro.org> | 2013-03-19 19:58:42 (GMT) |
commit | 1c155b3dfe08351f5fc811062648969f1ba7af53 (patch) | |
tree | f1e96de00305a0d3148d8131fd383e96e895d4bf /drivers/clk | |
parent | 3d6ee287a3e341c88eafd0b4620b12d640b3736b (diff) | |
download | linux-fsl-qoriq-1c155b3dfe08351f5fc811062648969f1ba7af53.tar.xz |
clk: Unprepare the unused prepared slow clocks at late init
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 b67bfe0d]
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/clk.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 7571b50..c0141f3 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -336,6 +336,28 @@ 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) { struct clk *child; @@ -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; |