Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH v4 15/37] PM / devfreq: tegra30: Add error messages to
 tegra_devfreq_target()
To:     Dmitry Osipenko <digetx@gmail.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Georgi Djakov <georgi.djakov@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Peter De Schrijver <pdeschrijver@nvidia.com>,
        MyungJoo Ham <myungjoo.ham@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Mikko Perttunen <cyndis@kapsi.fi>
Cc:     =?UTF-8?B?QXJ0dXIgxZp3aWdvxYQ=?= <a.swigon@samsung.com>,
        linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org
From:   Chanwoo Choi <cw00.choi@samsung.com>
Organization: Samsung Electronics
Message-ID: <1d11b08f-eed5-ece1-462d-b18151e65777@samsung.com>
Date:   Thu, 2 Jul 2020 10:12:31 +0900
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101
        Thunderbird/59.0
MIME-Version: 1.0
In-Reply-To: <20200609131404.17523-16-digetx@gmail.com>
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 101P
DLP-Filter: Pass
References: <20200609131404.17523-1-digetx@gmail.com>
        <CGME20200609131710epcas1p218e720c23ae62ecf4a6f6727854d93f0@epcas1p2.samsung.com>
        <20200609131404.17523-16-digetx@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 6/9/20 10:13 PM, Dmitry Osipenko wrote:
> It's useful to now when something goes wrong instead of failing silently,
> so let's add error messages to tegra_devfreq_target() to prevent situation
> where it fails silently.
> 
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/devfreq/tegra30-devfreq.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index 13f93c6038ab..a03fb16c5c4c 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -641,12 +641,16 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
>  	dev_pm_opp_put(opp);
>  
>  	err = clk_set_min_rate(tegra->emc_clock, rate * KHZ);
> -	if (err)
> +	if (err) {
> +		dev_err(dev, "Failed to set min rate: %d\n", err);
>  		return err;
> +	}
>  
>  	err = clk_set_rate(tegra->emc_clock, 0);
> -	if (err)
> +	if (err) {
> +		dev_err(dev, "Failed to set rate: %d\n", err);
>  		goto restore_min_rate;
> +	}
>  
>  	return 0;
>  
> 

Acked-by: Chanwoo Choi <cw00.choi@samsung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics