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 18:03:15 +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 04/27/2015 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.

Thanks,
Chanwoo Choi
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