linux-kernel - Re: [PATCH] cpufreq: amd_pstate: fix the highest perf query for new AMD processors

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Date:   Mon, 13 Jun 2022 23:02:25 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Perry Yuan <Perry.Yuan@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Jane Malalane <jane.malalane@...rix.com>,
        Kim Phillips <kim.phillips@....com>,
        Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org
Cc:     Ray.Huang@....com, Jinzhou.Su@....com, Li.Meng@....com,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH] cpufreq: amd_pstate: fix the highest perf query for new
 AMD processors

On 6/13/22 22:52, Perry Yuan wrote:
> In order to get the corrent highest perf for some new AMD processors,
> the amd_get_highest_perf() call will check the CPU model and
> return correct highest perf value.
> 
> Signed-off-by: Perry Yuan <Perry.Yuan@....com>

Reviewed-by: Mario Limonciello <mario.limonciello@....com>

> ---
>   arch/x86/kernel/cpu/amd.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index 0c0b09796ced..ff2075f26ef4 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -1152,7 +1152,8 @@ u32 amd_get_highest_perf(void)
>   	struct cpuinfo_x86 *c = &boot_cpu_data;
>   
>   	if (c->x86 == 0x17 && ((c->x86_model >= 0x30 && c->x86_model < 0x40) ||
> -			       (c->x86_model >= 0x70 && c->x86_model < 0x80)))
> +			       (c->x86_model >= 0x70 && c->x86_model < 0x80) ||
> +			       (c->x86_model >= 0xa0 && c->x86_model < 0xb0)))
>   		return 166;
>   
>   	if (c->x86 == 0x19 && ((c->x86_model >= 0x20 && c->x86_model < 0x30) ||