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UPSTREAM: clk: skip unnecessary set_phase if nothing to do

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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>

(cherry picked from git.kernel.org clk/linux.git clk-next
 commit 023bd7166b)

Change-Id: Icc3be314e8f696a18bf0cd92867cd5f956817bbc
This commit is contained in:
Shawn Lin 2016-02-26 09:25:52 +08:00 • committed by Huang, Tao
commit c0eebf54ca
1 changed files with 5 additions and 0 deletions
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5
drivers/clk/clk.c
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@ -1902,6 +1902,10 @@ int clk_set_phase(struct clk *clk, int degrees)
clk_prepare_lock();
/* bail early if nothing to do */
if (degrees == clk->core->phase)
goto out;
trace_clk_set_phase(clk->core, degrees);
if (clk->core->ops->set_phase)
@ -1912,6 +1916,7 @@ int clk_set_phase(struct clk *clk, int degrees)
if (!ret)
clk->core->phase = degrees;
out:
clk_prepare_unlock();
return ret;