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clk: migrate ref counts when orphans are reunited 

It's always nice to see families reunited, and this is equally true when
talking about parent clocks and their children. However, if the orphan
clk had a positive prepare_count or enable_count, then we would not
migrate those counts up the parent chain correctly.

This has manifested with the recent critical clocks feature, which often
enables clocks very early, before their parents have been registered.

Fixed by replacing the call to clk_core_reparent with calls to
__clk_set_parent_{before,after}.

Cc: James Liao <jamesjj.liao@mediatek.com>
Cc: Erin Lo <erin.lo@mediatek.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
[sboyd@codeaurora.org: Recalc accuracies and rates too]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Michael Turquette 2016-07-08 16:32:10 -07:00 committed by Stephen Boyd
parent e0cb1b8416
commit 904e6ead02
1 changed files with 10 additions and 2 deletions
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12
drivers/clk/clk.c
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@ -2449,8 +2449,16 @@ static int __clk_core_init(struct clk_core *core)
hlist_for_each_entry_safe(orphan, tmp2, &clk_orphan_list, child_node) {
struct clk_core *parent = __clk_init_parent(orphan);
if (parent)
clk_core_reparent(orphan, parent);
/*
* we could call __clk_set_parent, but that would result in a
* redundant call to the .set_rate op, if it exists
*/
if (parent) {
__clk_set_parent_before(orphan, parent);
__clk_set_parent_after(orphan, parent, NULL);
__clk_recalc_accuracies(orphan);
__clk_recalc_rates(orphan, 0);
}
}
/*