lkml.org 
[lkml]   [2022]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 4/7] cpufreq: amd_pstate: add AMD pstate EPP support for shared memory type processor
From
On 9/9/22 11:45, Perry Yuan wrote:
> Add Energy Performance Preference support for AMD SOCs which only
> support the shared memory interface that implemented on Zen2 and Zen3
> processors, because this type CPU has no MSR supported, it will use
> ACPI PCC channel to enable EPP and reset desired perf to be zero.
>
> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
> ---
> drivers/cpufreq/amd-pstate.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 451295284a26..fff298744a8e 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -133,12 +133,24 @@ static inline int pstate_enable(bool enable)
>
> static int cppc_enable(bool enable)
> {
> + struct cppc_perf_ctrls perf_ctrls;
> int cpu, ret = 0;
>
> for_each_present_cpu(cpu) {
> ret = cppc_set_enable(cpu, enable);
> if (ret)
> return ret;
> +
> + /* Enable active mode for EPP */
> + ret = cppc_set_auto_epp(cpu, enable);
> + if (ret)
> + return ret;
> +
> + /* Set zero to desired perf to enable EPP control*/
> + perf_ctrls.desired_perf = 0;
> + ret = cppc_set_perf(cpu, &perf_ctrls);
> + if (ret)
> + return ret;

Shouldn't this entire block be indented one additional tab over since its
part of the for_each_present_cpu() loop?

-Nathan

> }
>
> return ret;

\
 
 \ /
  Last update: 2022-09-15 18:25    [W:0.141 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site