From: Wyes Karny <wyes.karny@amd.com>
To: Perry Yuan <Perry.Yuan@amd.com>,
rafael.j.wysocki@intel.com, Mario.Limonciello@amd.com,
ray.huang@amd.com, viresh.kumar@linaro.org
Cc: Deepak.Sharma@amd.com, Nathan.Fontenot@amd.com,
Alexander.Deucher@amd.com, Shimmer.Huang@amd.com,
Xiaojian.Du@amd.com, Li.Meng@amd.com, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 4/9] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors
Date: Thu, 17 Nov 2022 19:32:36 +0530 [thread overview]
Message-ID: <5db2e4b8-cff4-8aed-a3ac-e26d0668d996@amd.com> (raw)
In-Reply-To: <20221110175847.3098728-5-Perry.Yuan@amd.com>
Hi Perry,
On 11/10/2022 11:28 PM, Perry Yuan wrote:
[snip]
> +
> +static ssize_t store_energy_performance_preference(
> + struct cpufreq_policy *policy, const char *buf, size_t count)
> +{
> + struct amd_cpudata *cpudata = policy->driver_data;
> + char str_preference[21];
> + ssize_t ret;
> + u32 epp = 0;
Here `epp` is a unused variable.
[snip]
> @@ -657,6 +1281,20 @@ static int __init amd_pstate_param(char *str)
> if (!str)
> return -EINVAL;
>
> + /*
> + * Disable amd-pstate driver by default for now
> + * append amd-pstate=active or amd-pstate=active
> + * to enable driver loaded
> + */
> + if (!strcmp(str, "active")) {
> + cppc_load = 1;
> + default_pstate_driver = &amd_pstate_epp_driver;
> + } else if (!strcmp(str, "passive")) {
> + epp_off = 1;
> + cppc_load = 1;
> + default_pstate_driver = &amd_pstate_driver;
> + }
> +
> /*
> * support shared memory type CPPC which has no MSR function.
> * enable amd-pstate on processors with shared memory solution
In the shared memory support section also `cppc_load` has to be set otherwise
amd_pstate=legacy_cppc will not work.
if (!strcmp(str, "legacy_cppc")) {
shared_mem = true;
cppc_load = 1;
}
--
Thanks & Regards,
Wyes
next prev parent reply other threads:[~2022-11-17 14:03 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-10 17:58 [PATCH v4 0/9] Implement AMD Pstate EPP Driver Perry Yuan
2022-11-10 17:58 ` [PATCH v4 1/9] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-11-10 17:58 ` [PATCH v4 2/9] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-11-10 17:58 ` [PATCH v4 3/9] cpufreq: amd-pstate: change amd-pstate driver to be built-in type Perry Yuan
2022-11-14 22:46 ` Limonciello, Mario
2022-11-15 2:02 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 4/9] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2022-11-14 22:40 ` Limonciello, Mario
2022-11-30 17:12 ` Yuan, Perry
2022-12-02 8:18 ` Yuan, Perry
2022-11-17 14:02 ` Wyes Karny [this message]
2022-11-18 3:54 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 5/9] cpufreq: amd_pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-11-10 17:58 ` [PATCH v4 6/9] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-11-10 17:58 ` [PATCH v4 7/9] cpufreq: amd-pstate: add frequency dynamic boost sysfs control Perry Yuan
2022-11-14 22:30 ` Limonciello, Mario
2022-11-30 17:13 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry Perry Yuan
2022-11-14 22:30 ` Limonciello, Mario
2022-11-30 17:13 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 9/9] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-11-14 22:29 ` Limonciello, Mario
2022-12-02 8:20 ` Yuan, Perry
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