linux-kernel - Re: [PATCH v4 11/37] PM / devfreq: tegra30: Silence deferred probe error

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Message-ID: <8e941321-5da6-e9e7-6a4e-8c0477911ebd@samsung.com>
Date:   Thu, 2 Jul 2020 10:34:59 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>
Cc:     Artur Świgoń <a.swigon@...sung.com>,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 11/37] PM / devfreq: tegra30: Silence deferred probe
 error

On 7/2/20 10:20 AM, Dmitry Osipenko wrote:
> 02.07.2020 03:59, Chanwoo Choi пишет:
>> Hi,
>>
>> On 6/9/20 10:13 PM, Dmitry Osipenko wrote:
>>> Tegra EMC driver was turned into a regular kernel driver, it also could
>>> be compiled as a loadable kernel module now. Hence EMC clock isn't
>>> guaranteed to be available and clk_get("emc") may return -EPROBE_DEFER and
>>> there is no good reason to spam KMSG with a error about missing EMC clock
>>> in this case, so let's silence the deferred probe error.
>>>
>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>> ---
>>>  drivers/devfreq/tegra30-devfreq.c | 9 ++++++---
>>>  1 file changed, 6 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
>>> index e94a27804c20..423dd35c95b3 100644
>>> --- a/drivers/devfreq/tegra30-devfreq.c
>>> +++ b/drivers/devfreq/tegra30-devfreq.c
>>> @@ -801,9 +801,12 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>>>  	}
>>>  
>>>  	tegra->emc_clock = devm_clk_get(&pdev->dev, "emc");
>>> -	if (IS_ERR(tegra->emc_clock)) {
>>> -		dev_err(&pdev->dev, "Failed to get emc clock\n");
>>> -		return PTR_ERR(tegra->emc_clock);
>>> +	err = PTR_ERR_OR_ZERO(tegra->emc_clock);
>>> +	if (err) {
>>> +		if (err != -EPROBE_DEFER)
>>> +			dev_err(&pdev->dev, "Failed to get emc clock: %d\n",
>>> +				err);
>>> +		return err;
>>>  	}
>>>  
>>>  	err = platform_get_irq(pdev, 0);
>>>
>>
>> As I commented on patch10, I recommend that you add the Tegra EMC driver
>> commit information into patch description and Looks good to me.
>>
> 
> Hello, Chanwoo!
> 
> This patch11 and patch10 are depending on the patches 4/5 (the Tegra EMC
> driver patches) of *this* series, hence there is no commit information.
> I'm expecting that this whole series will go via tegra tree once all the
> patches will be reviewed and collect all the necessary acks from you,
> ICC and CLK subsystem maintainers.
> 
> Please feel free to give yours ack to the patches 10/11 if they are good
> to you :)
> 
> 

OK. Looks good to me
Acked-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics