On 31 January 2015 at 02:31, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote:
> 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.
Hi, this looks good to me.
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Thanks,
Tomeu
> 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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> a Linux Foundation Collaborative Project
>
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