linux-kernel - Re: [PATCH v4 10/37] PM / devfreq: tegra20: Silence deferred probe error

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Message-ID: <14271aed-5fb6-14e1-3fe9-ef8d0c5013c4@samsung.com>
Date:   Thu, 2 Jul 2020 09:56:13 +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 10/37] PM / devfreq: tegra20: Silence deferred probe
 error

Hi Dmitry,

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

Looks good to me. But, you better to add the commit information
about Tegra EMC driver with commit-id ("patch title") format
into patch descritpion.

> 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/tegra20-devfreq.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/devfreq/tegra20-devfreq.c b/drivers/devfreq/tegra20-devfreq.c
> index ff82bac9ee4e..6469dc69c5e0 100644
> --- a/drivers/devfreq/tegra20-devfreq.c
> +++ b/drivers/devfreq/tegra20-devfreq.c
> @@ -141,9 +141,11 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>  
>  	/* EMC is a system-critical clock that is always enabled */
>  	tegra->emc_clock = devm_clk_get(&pdev->dev, "emc");
> -	if (IS_ERR(tegra->emc_clock)) {
> -		err = PTR_ERR(tegra->emc_clock);
> -		dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);
> +	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;
>  	}
>  
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics