diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2016-02-26 09:25:52 +0800 |
|---|---|---|
| committer | Stephen Boyd <sboyd@codeaurora.org> | 2016-02-25 18:10:51 -0800 |
| commit | 023bd7166be0595d18220dfd5c9765b3970f6ef3 (patch) | |
| tree | 0e4a273d8a1332e68ad7af4e8c30a22db6815fc6 /drivers/clk/clk.c | |
| parent | 2103a2156119b30f5924af2a1094227954be4617 (diff) | |
| download | linux-023bd7166be0595d18220dfd5c9765b3970f6ef3.tar.bz2 | |
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>
Diffstat (limited to 'drivers/clk/clk.c')
| -rw-r--r-- | drivers/clk/clk.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index d95d6f924cac..437eebf89fcf 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1841,6 +1841,10 @@ 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) @@ -1851,6 +1855,7 @@ int clk_set_phase(struct clk *clk, int degrees) if (!ret) clk->core->phase = degrees; +out: clk_prepare_unlock(); return ret; |