evie/android_kernel_oneplus_msm8998
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clk: msm: clock: Refactor the aggr_sibling_rates logic

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Return early if the branch clock does not need the rate
aggregation support. Only take the common branch_clk_lock
when needed; doing so unnecessarily will lead to lock
contention in some cases.

CRs-Fixed: 972426
Change-Id: I00476d1c193df025a1da19aa0d0ddf0f0462b4d0
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>
This commit is contained in:
Deepak Katragadda 2016-02-03 14:36:42 -08:00 • committed by David Keitel
parent 1c3a19b61d
commit ff072849f7
1 changed files with 36 additions and 35 deletions
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71
drivers/clk/msm/clock-local2.c
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@ -647,15 +647,16 @@ static int branch_clk_prepare(struct clk *c)
unsigned long curr_rate;
int ret = 0;
if (!branch->aggr_sibling_rates)
return ret;
mutex_lock(&branch_clk_lock);
branch->is_prepared = false;
if (branch->aggr_sibling_rates) {
curr_rate = branch_clk_aggregate_rate(c->parent);
if (c->rate > curr_rate) {
ret = clk_set_rate(c->parent, c->rate);
if (ret)
goto exit;
}
curr_rate = branch_clk_aggregate_rate(c->parent);
if (c->rate > curr_rate) {
ret = clk_set_rate(c->parent, c->rate);
if (ret)
goto exit;
}
branch->is_prepared = true;
exit:
@ -699,14 +700,15 @@ static void branch_clk_unprepare(struct clk *c)
struct branch_clk *branch = to_branch_clk(c);
unsigned long curr_rate, new_rate;
if (!branch->aggr_sibling_rates)
return;
mutex_lock(&branch_clk_lock);
branch->is_prepared = false;
if (branch->aggr_sibling_rates) {
new_rate = branch_clk_aggregate_rate(c->parent);
curr_rate = max(new_rate, c->rate);
if (new_rate < curr_rate)
clk_set_rate(c->parent, new_rate);
}
new_rate = branch_clk_aggregate_rate(c->parent);
curr_rate = max(new_rate, c->rate);
if (new_rate < curr_rate)
clk_set_rate(c->parent, new_rate);
mutex_unlock(&branch_clk_lock);
}
@ -764,31 +766,30 @@ static int branch_clk_set_rate(struct clk *c, unsigned long rate)
if (branch->has_sibling)
return -EPERM;
if (!branch->aggr_sibling_rates)
return clk_set_rate(c->parent, rate);
mutex_lock(&branch_clk_lock);
if (branch->aggr_sibling_rates) {
if (!branch->is_prepared) {
c->rate = rate;
goto exit;
}
/*
* Get the aggregate rate without this clock's vote and update
* if the new rate is different than the current rate.
*/
list_for_each_entry(clkp, &parent->children, siblings) {
clkh = to_branch_clk(clkp);
if (clkh->is_prepared && clkh != branch)
other_rate = max(clkp->rate, other_rate);
}
curr_rate = max(other_rate, c->rate);
new_rate = max(other_rate, rate);
if (new_rate != curr_rate) {
ret = clk_set_rate(parent, new_rate);
if (!ret)
c->rate = rate;
}
if (!branch->is_prepared) {
c->rate = rate;
goto exit;
}
ret = clk_set_rate(c->parent, rate);
/*
* Get the aggregate rate without this clock's vote and update
* if the new rate is different than the current rate.
*/
list_for_each_entry(clkp, &parent->children, siblings) {
clkh = to_branch_clk(clkp);
if (clkh->is_prepared && clkh != branch)
other_rate = max(clkp->rate, other_rate);
}
curr_rate = max(other_rate, c->rate);
new_rate = max(other_rate, rate);
if (new_rate != curr_rate) {
ret = clk_set_rate(parent, new_rate);
if (!ret)
c->rate = rate;
}
exit:
mutex_unlock(&branch_clk_lock);
return ret;