clk: Only recalculate the rate if needed

We don't really need to recalculate the effective rate of a clock when a
per-user clock is removed, if the constraints of the later aren't
limiting the requested rate.

This was causing problems with clocks that never had a rate set before,
as rate_req would be zero. Though this could be considered a bug in the
implementation of those clocks, this should be checked somewhere else.

Fixes: 1c8e600440c7 ("clk: Add rate constraints to clocks")
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f3a7a4425242..a27f14116cc9 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2664,7 +2664,10 @@ void __clk_put(struct clk *clk)
         clk_prepare_lock();
 
         hlist_del(&clk->child_node);
-        clk_core_set_rate_nolock(clk->core, clk->core->req_rate);
+        if (clk->min_rate > clk->core->req_rate ||
+            clk->max_rate < clk->core->req_rate)
+                clk_core_set_rate_nolock(clk->core, clk->core->req_rate);
+
         owner = clk->core->owner;
         kref_put(&clk->core->ref, __clk_release);