linux-kernel - Re: [PATCH] Enable AMD3255 Proc to show negative temperature

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Date:   Sat, 10 Jun 2023 13:58:56 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Baskaran Kannan <Baski.Kannan@....com>, Mario.Limonciello@....com,
        babu.moger@....com, clemens@...isch.de, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Baskaran Kannan <bakannan@....com>
Subject: Re: [PATCH] Enable AMD3255 Proc to show negative temperature

On 6/10/23 13:53, Baskaran Kannan wrote:
> From: Baskaran Kannan <bakannan@....com>
> 
> Signed-off-by: Baskaran Kannan <Baski.Kannan@....com>

Please resubmit and either make the changes you were asked to make,
or explain why you did not follow them.

Guenter

> ---
>   drivers/hwmon/k10temp.c | 18 ++++++++++++++++++
>   1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index 489ad0b1bc74..a79aac0596e5 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -77,6 +77,12 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>   #define ZEN_CUR_TEMP_RANGE_SEL_MASK		BIT(19)
>   #define ZEN_CUR_TEMP_TJ_SEL_MASK		GENMASK(17, 16)
>   
> +/*
> + * AMD's Industrial processor 3255 supports temperature from -40 deg to 105 deg Celsius.
> + * Do not round off to zero for negative Tctl or Tdie values.
> + */
> +#define AMD_I3255_STR				"3255"
> +
>   struct k10temp_data {
>   	struct pci_dev *pdev;
>   	void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
> @@ -86,6 +92,7 @@ struct k10temp_data {
>   	u32 show_temp;
>   	bool is_zen;
>   	u32 ccd_offset;
> +	bool disp_negative; /*Flag set for AMD i3255. Family 17h, Model 0x0-0xf */
>   };
>   
>   #define TCTL_BIT	0
> @@ -204,9 +211,15 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>   		switch (channel) {
>   		case 0:		/* Tctl */
>   			*val = get_raw_temp(data);
> +			if (*val < 0 && (data->disp_negative == false) ){
> +				*val = 0;
> +			}
>   			break;
>   		case 1:		/* Tdie */
>   			*val = get_raw_temp(data) - data->temp_offset;
> +			if (*val < 0 && (data->disp_negative == false) ){
> +				*val = 0;
> +			}
>   			break;
>   		case 2 ... 13:		/* Tccd{1-12} */
>   			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
> @@ -401,6 +414,11 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   	data->pdev = pdev;
>   	data->show_temp |= BIT(TCTL_BIT);	/* Always show Tctl */
>   
> +	if (boot_cpu_data.x86 == 0x17 &&
> +		strstr(boot_cpu_data.x86_model_id, AMD_I3255_STR)) {
> +		data->disp_negative = true;
> +	}
> +
>   	if (boot_cpu_data.x86 == 0x15 &&
>   	    ((boot_cpu_data.x86_model & 0xf0) == 0x60 ||
>   	     (boot_cpu_data.x86_model & 0xf0) == 0x70)) {