PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
EMC clock is always-on and can't be zero. Check whether clk_round_rate() returns zero rate and error out if it does. It can return zero if clock tree isn't initialized properly. Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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@ -891,9 +891,9 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
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return err;
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rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
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if (rate < 0) {
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if (rate <= 0) {
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dev_err(&pdev->dev, "Failed to round clock rate: %ld\n", rate);
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return rate;
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return rate ?: -EINVAL;
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}
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tegra->max_freq = rate / KHZ;
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