From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Stephen Boyd <sboyd@kernel.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>
Cc: linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org
Subject: [PATCH v2 4/4] PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
Date: Mon, 20 Sep 2021 20:22:49 +0300 [thread overview]
Message-ID: <20210920172249.28206-5-digetx@gmail.com> (raw)
In-Reply-To: <20210920172249.28206-1-digetx@gmail.com>
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>
---
drivers/devfreq/tegra30-devfreq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index d83fdc2713ed..65ecf17a36f4 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -891,9 +891,9 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
return err;
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);
- return rate;
+ return rate ?: -EINVAL;
}
tegra->max_freq = rate / KHZ;
--
2.32.0
next prev parent reply other threads:[~2021-09-20 21:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-20 17:22 [PATCH v2 0/4] Make probe() of Tegra devfreq driver completely resource-managed Dmitry Osipenko
2021-09-20 17:22 ` [PATCH v2 1/4] opp: Add more resource-managed variants of dev_pm_opp_of_add_table() Dmitry Osipenko
2021-10-04 11:04 ` Viresh Kumar
2021-10-04 14:52 ` Dmitry Osipenko
2021-09-20 17:22 ` [PATCH v2 2/4] PM / devfreq: Add devm_devfreq_add_governor() Dmitry Osipenko
2021-09-22 7:49 ` Chanwoo Choi
2021-09-20 17:22 ` [PATCH v2 3/4] PM / devfreq: tegra30: Use resource-managed helpers Dmitry Osipenko
2021-09-22 8:11 ` Chanwoo Choi
2021-09-20 17:22 ` Dmitry Osipenko [this message]
2021-10-05 4:25 ` [PATCH v2 0/4] Make probe() of Tegra devfreq driver completely resource-managed Viresh Kumar
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