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clk: skip unnecessary set_phase if nothing to do 

Let's compare the degrees from clk_set_rate with
clk->core->phase. If the requested degrees is already
there, skip the following steps.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[sboyd@codeaurora.org: s/drgrees/degrees/ in commit text]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Shawn Lin 2016-02-26 09:25:52 +08:00 committed by Stephen Boyd
parent 2103a21561
commit 023bd7166b
1 changed files with 5 additions and 0 deletions
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5
drivers/clk/clk.c
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@ -1841,6 +1841,10 @@ int clk_set_phase(struct clk *clk, int degrees)
clk_prepare_lock(); clk_prepare_lock();
/* bail early if nothing to do */
if (degrees == clk->core->phase)
goto out;
trace_clk_set_phase(clk->core, degrees); trace_clk_set_phase(clk->core, degrees);
if (clk->core->ops->set_phase) if (clk->core->ops->set_phase)
@ -1851,6 +1855,7 @@ int clk_set_phase(struct clk *clk, int degrees)
if (!ret) if (!ret)
clk->core->phase = degrees; clk->core->phase = degrees;
out:
clk_prepare_unlock(); clk_prepare_unlock();
return ret; return ret;