[v5,14/36] PM / devfreq: tegra20: Add error messages to tegra_devfreq_target()

Commit Message

Dmitry Osipenko Aug. 14, 2020, 12:05 a.m. UTC

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 <[e-mail]>
Signed-off-by: Dmitry Osipenko <[e-mail]>
---
 drivers/devfreq/tegra20-devfreq.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

Patch

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;