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PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate

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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>
This commit is contained in:
Dmitry Osipenko 2021-09-20 20:22:49 +03:00 committed by Viresh Kumar
parent 68b79f2855
commit 4844bdbe91
1 changed files with 2 additions and 2 deletions
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4
drivers/devfreq/tegra30-devfreq.c
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@ -891,9 +891,9 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
return err; return err;
rate = clk_round_rate(tegra->emc_clock, ULONG_MAX); rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
if (rate < 0) { if (rate <= 0) {
dev_err(&pdev->dev, "Failed to round clock rate: %ld\n", rate); dev_err(&pdev->dev, "Failed to round clock rate: %ld\n", rate);
return rate; return rate ?: -EINVAL;
} }
tegra->max_freq = rate / KHZ; tegra->max_freq = rate / KHZ;