From: Chanwoo Choi <cwchoi00@gmail.com>
To: Dmitry Osipenko <digetx@gmail.com>,
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: Re: [PATCH v1 4/4] PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
Date: Wed, 15 Sep 2021 12:51:11 +0900 [thread overview]
Message-ID: <9fa66405-883a-3653-eb5d-3cd7eee07a0a@gmail.com> (raw)
In-Reply-To: <20210912184458.17995-5-digetx@gmail.com>
Hi,
On 21. 9. 13. 오전 3:44, Dmitry Osipenko wrote:
> 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.
>
> 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;
>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
--
Best Regards,
Samsung Electronics
Chanwoo Choi
next prev parent reply other threads:[~2021-09-15 3:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-12 18:44 [PATCH v1 0/4] Make probe() of Tegra devfreq driver completely resource-managed Dmitry Osipenko
2021-09-12 18:44 ` [PATCH v1 1/4] opp: Add more resource-managed variants of dev_pm_opp_of_add_table() Dmitry Osipenko
2021-09-12 18:44 ` [PATCH v1 2/4] PM / devfreq: Add devm_devfreq_add_governor() Dmitry Osipenko
2021-09-15 18:23 ` Chanwoo Choi
2021-09-16 1:30 ` Dmitry Osipenko
2021-09-15 18:37 ` Chanwoo Choi
2021-09-16 1:29 ` Dmitry Osipenko
2021-09-12 18:44 ` [PATCH v1 3/4] PM / devfreq: tegra30: Use resource-managed helpers Dmitry Osipenko
2021-09-12 18:44 ` [PATCH v1 4/4] PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate Dmitry Osipenko
2021-09-15 3:51 ` Chanwoo Choi [this message]
2021-09-15 18:31 ` Chanwoo Choi
2021-09-16 1:28 ` Dmitry Osipenko
2021-09-19 9:43 ` Chanwoo Choi
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