linux-kernel - Re:回复: Re:回复: [PATCH] cpufreq: create cooling device based on ACPI

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Message-ID: <4ed89b6b.6517.18804d6178f.Coremail.wangyouwan@126.com>
Date:   Wed, 10 May 2023 16:45:19 +0800 (CST)
From:   wangyouwan <wangyouwan@....com>
To:     "Xinglong Yang" <xinglong.yang@...tech.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re:回复: Re:回复: [PATCH] cpufreq: create cooling device based on ACPI



thanks,i try



At 2023-05-10 16:26:14, "Xinglong Yang" <xinglong.yang@...tech.com> wrote:



 P {margin-top:0;margin-bottom:0;} 




If you use ACPI firware, why you register cpu as cooling devices device in cpufreq_online
 function?







When
 the kernel use ACPI firmware, CPUs will be registed as cooling devices during the cpu initialization, please refs to the file "processor_driver.c"







That is not needed to register it again.  



发件人: wangyouwan <wangyouwan@....com>

发送时间: 2023年5月10日 16:07

收件人: Xinglong Yang <xinglong.yang@...tech.com>

主题: Re:回复: [PATCH] cpufreq: create cooling device based on ACPI

 




EXTERNAL EMAIL



yes ， I'm using the 5.4 kernel, and the "scpi-cpufreq" function is used in the scpi_clocks_probe_acpi function.







At 2023-05-08 15:12:51, "Xinglong Yang" <xinglong.yang@...tech.com> wrote:

>Does this patch need to be packaged with other patches?

>Whether the function cpufreq_cooling_register is declared in cpufreq.c?

>

>-----邮件原件-----

>发件人: wangyouwan@....com <wangyouwan@....com>

>发送时间: 2023年4月28日 15:03

>收件人: rafael@...nel.org; viresh.kumar@...aro.org

>抄送: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; youwan Wang <wangyouwan@....com>

>主题: [PATCH] cpufreq: create cooling device based on ACPI

>

>EXTERNAL EMAIL

>

>From: youwan Wang <wangyouwan@....com>

>

>When using the "scpi_cpufreq" driver, an error

>occurs:cpufreq_cooling: OF node not available for cpu*.

>The current computer motherboard is using ACPI firmware.

>Go to see that the error is caused by calling the "of_cpufreq_cooling_register" interface.

>comment:create cpufreq cooling device based on DT.

>

>Signed-off-by: youwan Wang <wangyouwan@....com>

>---

> drivers/cpufreq/cpufreq.c | 7 ++++++-

> 1 file changed, 6 insertions(+), 1 deletion(-)

>

>diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 6b52ebe5a890..3418c68959d5 100644

>--- a/drivers/cpufreq/cpufreq.c

>+++ b/drivers/cpufreq/cpufreq.c

>@@ -1528,8 +1528,13 @@ static int cpufreq_online(unsigned int cpu)

>        if (cpufreq_driver->ready)

>                cpufreq_driver->ready(policy);

>

>-       if (cpufreq_thermal_control_enabled(cpufreq_driver))

>+       if (cpufreq_thermal_control_enabled(cpufreq_driver)) { #ifdef

>+CONFIG_ACPI

>+               policy->cdev = cpufreq_cooling_register(policy); #else

>                policy->cdev = of_cpufreq_cooling_register(policy);

>+#endif

>+       }

>

>        pr_debug("initialization complete\n");

>

>--

>2.25.1

>

>

>

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