From: Sudeep Holla <sudeep.holla@arm.com>
To: Joseph Lo <josephl@nvidia.com>
Cc: linux-pm@vger.kernel.org,
Daniel Lezcano <daniel.lezcano@linaro.org>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Sudeep Holla <sudeep.holla@arm.com>,
linux-tegra@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] cpuidle: dt: bail out if the idle-state DT node is not compatible
Date: Thu, 31 Jan 2019 10:38:23 +0000 [thread overview]
Message-ID: <20190131103823.GA19907@e107155-lin> (raw)
In-Reply-To: <20190131022749.19046-1-josephl@nvidia.com>
On Thu, Jan 31, 2019 at 10:27:49AM +0800, Joseph Lo wrote:
> Currently, the DT of the idle states will be parsed first whether it's
> compatible or not. This could cause a warning message that comes from if
> the CPU doesn't support identical idle states. E.g. Tegra186 can run
> with 2 Cortex-A57 and 2 Denver cores with different idle states on
> different types of these cores.
>
> We fix it to check the compatible string before the parsing procedures.
> So it can make sure it only goes through the idle states that the CPU
> supported.
>
> Signed-off-by: Joseph Lo <josephl@nvidia.com>
> ---
> drivers/cpuidle/dt_idle_states.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
> index 53342b7f1010..4a528908abb3 100644
> --- a/drivers/cpuidle/dt_idle_states.c
> +++ b/drivers/cpuidle/dt_idle_states.c
> @@ -180,6 +180,11 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
> if (!state_node)
> break;
>
> + if (!of_device_is_compatible(state_node, matches->compatible)) {
> + err = -EINVAL;
> + break;
> + }
> +
Does it make sense to use of_match_node to get the matching device id and
just pass that to init_state_node instead of the complete array to find the
match.
--
Regards,
Sudeep
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next prev parent reply other threads:[~2019-01-31 10:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 2:27 [PATCH] cpuidle: dt: bail out if the idle-state DT node is not compatible Joseph Lo
2019-01-31 10:38 ` Sudeep Holla [this message]
2019-02-01 1:42 ` Joseph Lo
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