linux-kernel - [PATCH v5 14/36] PM / devfreq: tegra20: Add error messages to tegra_devfreq

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Message-Id: <20200814000621.8415-15-digetx@gmail.com>
Date:   Fri, 14 Aug 2020 03:05:59 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     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>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>
Cc:     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: [PATCH v5 14/36] PM / devfreq: tegra20: Add error messages to tegra_devfreq_target()

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.

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/devfreq/tegra20-devfreq.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/devfreq/tegra20-devfreq.c b/drivers/devfreq/tegra20-devfreq.c
index a985f24098f5..bc43284996de 100644
--- a/drivers/devfreq/tegra20-devfreq.c
+++ b/drivers/devfreq/tegra20-devfreq.c
@@ -44,19 +44,25 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
 	int err;
 
 	opp = devfreq_recommended_opp(dev, freq, flags);
-	if (IS_ERR(opp))
+	if (IS_ERR(opp)) {
+		dev_err(dev, "failed to find opp for %lu Hz\n", *freq);
 		return PTR_ERR(opp);
+	}
 
 	rate = dev_pm_opp_get_freq(opp);
 	dev_pm_opp_put(opp);
 
 	err = clk_set_min_rate(tegra->emc_clock, rate);
-	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;
 
-- 
2.27.0