linux-kernel - Re: [PATCH v1] hwmon, via-cputem: support new centaur CPUs

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Date:   Thu, 29 Mar 2018 06:42:06 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     David Wang <davidwang@...oxin.com>, jdelvare@...e.com,
        tglx@...utronix.de, mingo@...hat.com, rjw@...ysocki.net,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     brucechang@...-alliance.com, cooperyan@...oxin.com,
        qiyuanwang@...oxin.com, benjaminpan@...tech.com,
        lukelin@...cpu.com, timguo@...oxin.com
Subject: Re: [PATCH v1] hwmon, via-cputem: support new centaur CPUs

On 03/28/2018 11:36 PM, David Wang wrote:
> Newer centaur CPUs(Family == 7) also support this cpu temperature sensor.
> 
> Signed-off-by: David Wang <davidwang@...oxin.com>
> ---

FWIW, this would be v2, not v1, and a changelog would be appreciated.

>   drivers/hwmon/via-cputemp.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/hwmon/via-cputemp.c b/drivers/hwmon/via-cputemp.c
> index 07a0cb0..2f5bd50 100644
> --- a/drivers/hwmon/via-cputemp.c
> +++ b/drivers/hwmon/via-cputemp.c
> @@ -136,6 +136,11 @@ static int via_cputemp_probe(struct platform_device *pdev)
>   	data->id = pdev->id;
>   	data->name = "via_cputemp";
>   
> +	if (c->x86 == 7) {
> +		data->msr_temp = 0x1423;
> +		goto test_access;
> +	}

Please rework to not require a goto. Something like

	if (c->x86 == 7) {
		data->msr_temp = 0x1423;
	} else switch (c->x86_model) {
		...
	}

should do.

Thanks,
Guenter

> +
>   	switch (c->x86_model) {
>   	case 0xA:
>   		/* C7 A */
> @@ -152,6 +157,7 @@ static int via_cputemp_probe(struct platform_device *pdev)
>   		return -ENODEV;
>   	}
>   
> +test_access:
>   	/* test if we can access the TEMPERATURE MSR */
>   	err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
>   	if (err) {
> @@ -283,6 +289,7 @@ static int via_cputemp_down_prep(unsigned int cpu)
>   	{ X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
>   	{ X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
>   	{ X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
> +	{ X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, },
>   	{}
>   };
>   MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
>