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 18:06:30 +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

On 04/27/2015 06:03 PM, Chanwoo Choi wrote:
> Hi Sylwester,
> 
> On 04/27/2015 05:51 PM, Sylwester Nawrocki wrote:
>> Hi Chanwoo,
>>
>> On 27/04/15 10:46, Chanwoo Choi wrote:
>>>>> 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);
>>
>> I wouldn't worry about line length over 80 characters, it not a hard rule.
>> Let's leave the error code as it might be useful for debugging.
>>
> 
> OK, I'll add error value again.

As you commented, I'll add all information as following:
	pr_err("clk: couldn't set %s clk rate to %ld (%d), current rate: %ld\n",
                              __clk_get_name(clk), rate, rc, clk_get_rate(clk));

Thanks,
Chanwoo Choi

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