linux-kernel - Re: [PATCH v3 15/17] driver/cpufreq: enable Hygon support to cpufreq driver

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Date:   Tue, 14 Aug 2018 12:11:44 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Pu Wen <puwen@...on.cn>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        thomas.lendacky@....com, Borislav Petkov <bp@...en8.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3 15/17] driver/cpufreq: enable Hygon support to cpufreq driver

On Monday, August 13, 2018 6:22:16 PM CEST Pu Wen wrote:
> On 2018/8/12 17:55, Rafael J. Wysocki wrote:
> > On Sat, Aug 11, 2018 at 3:36 PM Pu Wen <puwen@...on.cn> wrote:
> >>
> >> Enable ACPI cpufreq driver support for Hygon by adding family ID check
> >> along with AMD.
> >>
> >> As Hygon platforms have SMBus device(PCI device ID 0x790b), enable Hygon
> >> support to function amd_freq_sensitivity_init().
> >>
> >> Signed-off-by: Pu Wen <puwen@...on.cn>
> > 
> > Is there any technical difference between HYGON and AMD?
> 
> For ACPI cpufreq patch, you are right. But for the whole point of view,
> there has some technical difference between Hygon Dhyana and AMD Family
> 17h.
> For cpufreq if not added X86_VENDOR_HYGON codes, this driver will not
> work functionally on Hygon platforms.
> 
> > 
> > You seem to be mechanically adding X86_VENDOR_HYGON wherever
> > X86_VENDOR_AMD is used.
> 
> X86_VENDOR_HYGON is not mechanically added wherever X86_VENDOR_AMD is
> used, we have reviewed and tested the features wherever X86_VENDOR_HYGON
> is needed.
> 
> As Hygon Dhyana can share code path with AMD family 17h, to minimize the
> code duplication, we choose to reuse the AMD's codes here.

OK

The cpufreq changes are fine by me.

Thanks!