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>
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d95d6f9..437eebf8 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1841,6 +1841,10 @@
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 @@
if (!ret)
clk->core->phase = degrees;
+out:
clk_prepare_unlock();
return ret;