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

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Date:   Tue, 14 Aug 2018 12:12:29 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Pu Wen <puwen@...on.cn>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, thomas.lendacky@....com, bp@...en8.de,
        pbonzini@...hat.com, viresh.kumar@...aro.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 15/17] driver/cpufreq: enable Hygon support to cpufreq driver

On Saturday, August 11, 2018 3:29:52 PM CEST Pu Wen 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>
> ---
>  drivers/cpufreq/acpi-cpufreq.c         | 5 +++++
>  drivers/cpufreq/amd_freq_sensitivity.c | 9 +++++++--
>  2 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index b61f4ec..d62fd37 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -61,6 +61,7 @@ enum {
>  
>  #define INTEL_MSR_RANGE		(0xffff)
>  #define AMD_MSR_RANGE		(0x7)
> +#define HYGON_MSR_RANGE		(0x7)
>  
>  #define MSR_K7_HWCR_CPB_DIS	(1ULL << 25)
>  
> @@ -95,6 +96,7 @@ static bool boost_state(unsigned int cpu)
>  		rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
>  		msr = lo | ((u64)hi << 32);
>  		return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
> +	case X86_VENDOR_HYGON:
>  	case X86_VENDOR_AMD:
>  		rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
>  		msr = lo | ((u64)hi << 32);
> @@ -113,6 +115,7 @@ static int boost_set_msr(bool enable)
>  		msr_addr = MSR_IA32_MISC_ENABLE;
>  		msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
>  		break;
> +	case X86_VENDOR_HYGON:
>  	case X86_VENDOR_AMD:
>  		msr_addr = MSR_K7_HWCR;
>  		msr_mask = MSR_K7_HWCR_CPB_DIS;
> @@ -225,6 +228,8 @@ static unsigned extract_msr(struct cpufreq_policy *policy, u32 msr)
>  
>  	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
>  		msr &= AMD_MSR_RANGE;
> +	else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
> +		msr &= HYGON_MSR_RANGE;
>  	else
>  		msr &= INTEL_MSR_RANGE;
>  
> diff --git a/drivers/cpufreq/amd_freq_sensitivity.c b/drivers/cpufreq/amd_freq_sensitivity.c
> index be926d9..4ac7c3c 100644
> --- a/drivers/cpufreq/amd_freq_sensitivity.c
> +++ b/drivers/cpufreq/amd_freq_sensitivity.c
> @@ -111,11 +111,16 @@ static int __init amd_freq_sensitivity_init(void)
>  {
>  	u64 val;
>  	struct pci_dev *pcidev;
> +	unsigned int pci_vendor;
>  
> -	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
> +	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
> +		pci_vendor = PCI_VENDOR_ID_AMD;
> +	else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
> +		pci_vendor = PCI_VENDOR_ID_HYGON;
> +	else
>  		return -ENODEV;
>  
> -	pcidev = pci_get_device(PCI_VENDOR_ID_AMD,
> +	pcidev = pci_get_device(pci_vendor,
>  			PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, NULL);
>  
>  	if (!pcidev) {
> 

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>