linux-kernel - Re: [PATCH v2] clk: Show clock rate and error value when fail to set clock rate

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Date:	Mon, 27 Apr 2015 17:46:37 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	mturquette@...aro.org, sboyd@...eaurora.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clk: Show clock rate and error value when fail to set
 clock rate

Hi Sylwester,

On 04/21/2015 05:37 PM, Sylwester Nawrocki wrote:
> Hi Chanwoo,
> 
> On 20/04/15 13:08, Chanwoo Choi wrote:
>> This patch shows the current clock rate nad error value when clk_set_rate()
>> fail to set the clock rate because log messgae means only the clock rate.
>>
>> Cc: Mike Turquette <mturquette@...aro.org>
>> Cc: Stephen Boyd <sboyd@...eaurora.org>
>> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>> Changes from v1:
>> - Add error value of clk-set_rate() with current clock rate
>>
>>  drivers/clk/clk-conf.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clk/clk-conf.c b/drivers/clk/clk-conf.c
>> index aad4796..2b6375f 100644
>> --- a/drivers/clk/clk-conf.c
>> +++ b/drivers/clk/clk-conf.c
>> @@ -107,8 +107,9 @@ static int __set_clk_rates(struct device_node *node, bool clk_supplier)
>>  
>>  			rc = clk_set_rate(clk, rate);
>>  			if (rc < 0)
>> -				pr_err("clk: couldn't set %s clock rate: %d\n",
>> -				       __clk_get_name(clk), rc);
>> +				pr_err("clk: couldn't set %s rate to %ld (%d)\n",
>> +				       __clk_get_name(clk), clk_get_rate(clk),
>> +				       rc);
> 
> Apologies for my previous misleading comment, with this patch
> you log current clock rate as the rate which was attempted to 
> be set. And these two will likely be different when clk_set_rate()
> failed. So it should rather be:
> 
> pr_err("clk: couldn't set %s clk rate to %ld (%d)\n",
>        __clk_get_name(clk), rate, rc);

I'll modify it as following without error value.
If I add the error value, the number of character are over 80.
	pr_err("clk: couldn't set %s clk rate to %ld\n",
        	__clk_get_name(clk), rate);

Thanks,
Chanwoo Choi
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