From c0eebf54ca3300666972ecb74faeb545a5303288 Mon Sep 17 00:00:00 2001 From: Shawn Lin Date: Fri, 26 Feb 2016 09:25:52 +0800 Subject: [PATCH] UPSTREAM: 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 [sboyd@codeaurora.org: s/drgrees/degrees/ in commit text] Signed-off-by: Stephen Boyd (cherry picked from git.kernel.org clk/linux.git clk-next commit 023bd7166be0595d18220dfd5c9765b3970f6ef3) Change-Id: Icc3be314e8f696a18bf0cd92867cd5f956817bbc --- drivers/clk/clk.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index bd64a9414de2..544c9564c621 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -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; -- 2.34.1