On 01/29, Stephen Boyd wrote:
> On 01/29/15 05:31, Geert Uytterhoeven wrote:
> > Hi Tomeu, Mike,
> >
> > On Fri, Jan 23, 2015 at 12:03 PM, Tomeu Vizoso
> > <tomeu.vizoso@xxxxxxxxxxxxx> wrote:
> >> --- a/drivers/clk/clk.c
> >> +++ b/drivers/clk/clk.c
> >> @@ -2391,25 +2543,24 @@ int __clk_get(struct clk *clk)
> >> return 1;
> >> }
> >>
> >> -static void clk_core_put(struct clk_core *core)
> >> +void __clk_put(struct clk *clk)
> >> {
> >> struct module *owner;
> >>
> >> - owner = core->owner;
> >> + if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
> >> + return;
> >>
> >> clk_prepare_lock();
> >> - kref_put(&core->ref, __clk_release);
> >> +
> >> + hlist_del(&clk->child_node);
> >> + clk_core_set_rate_nolock(clk->core, clk->core->req_rate);
> > At this point, clk->core->req_rate is still zero, causing
> > cpg_div6_clock_round_rate() to be called with a zero "rate" parameter,
> > e.g. on r8a7791:
>
> Hmm.. I wonder if we should assign core->req_rate to be the same as
> core->rate during __clk_init()? That would make this call to
> clk_core_set_rate_nolock() a nop in this case.
>
Here's a patch to do this
---8<----
From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Subject: [PATCH] clk: Assign a requested rate by default
We need to assign a requested rate here so that we avoid
requesting a rate of 0 on clocks when we remove clock consumers.
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
---
drivers/clk/clk.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index a29daf9edea4..8416ed1c40be 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2142,6 +2142,7 @@ int __clk_init(struct device *dev, struct clk *clk_user)
struct clk_core *orphan;
struct hlist_node *tmp2;
struct clk_core *clk;
+ unsigned long rate;
if (!clk_user)
return -EINVAL;
@@ -2266,12 +2267,13 @@ int __clk_init(struct device *dev, struct clk *clk_user)
* then rate is set to zero.
*/
if (clk->ops->recalc_rate)
- clk->rate = clk->ops->recalc_rate(clk->hw,
+ rate = clk->ops->recalc_rate(clk->hw,
clk_core_get_rate_nolock(clk->parent));
else if (clk->parent)
- clk->rate = clk->parent->rate;
+ rate = clk->parent->rate;
else
- clk->rate = 0;
+ rate = 0;
+ clk->rate = clk->req_rate = rate;
/*
* walk the list of orphan clocks and reparent any that are children of
--
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