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[94.29.35.107]) by smtp.gmail.com with ESMTPSA id d13sm1646000lfa.40.2019.04.11.15.30.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Apr 2019 15:30:01 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , MyungJoo Ham , Kyungmin Park , Chanwoo Choi Cc: linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v1 3/8] PM / devfreq: tegra: Don't ignore clk errors Date: Fri, 12 Apr 2019 01:29:09 +0300 Message-Id: <20190411222914.25539-4-digetx@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190411222914.25539-1-digetx@gmail.com> References: <20190411222914.25539-1-digetx@gmail.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The clk_set_min_rate() could fail and in this case clk_set_rate() sets rate to 0, which may drop EMC rate to minimum and make machine very difficult to use. Signed-off-by: Dmitry Osipenko --- drivers/devfreq/tegra-devfreq.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c index d749399f67ae..6185e7ab20a8 100644 --- a/drivers/devfreq/tegra-devfreq.c +++ b/drivers/devfreq/tegra-devfreq.c @@ -487,6 +487,7 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq, struct tegra_devfreq *tegra = dev_get_drvdata(dev); struct dev_pm_opp *opp; unsigned long rate; + int err; opp = devfreq_recommended_opp(dev, freq, flags); if (IS_ERR(opp)) { @@ -496,8 +497,13 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq, rate = dev_pm_opp_get_freq(opp) * KHZ; dev_pm_opp_put(opp); - clk_set_min_rate(tegra->emc_clock, rate); - clk_set_rate(tegra->emc_clock, 0); + err = clk_set_min_rate(tegra->emc_clock, rate); + if (err) + return err; + + err = clk_set_rate(tegra->emc_clock, 0); + if (err) + return err; return 0; }