linux-kernel - Re: [PATCH v2 1/3] hwmon: (k10temp): Rework the temperature offset calculation

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Date:   Fri, 27 Aug 2021 13:55:13 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Clemens Ladisch <clemens@...isch.de>, linux-hwmon@...r.kernel.org,
        Gabriel Craciunescu <nix.or.die@...glemail.com>,
        Wei Huang <wei.huang2@....com>,
        Jean Delvare <jdelvare@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] hwmon: (k10temp): Rework the temperature offset
 calculation

On Fri, Aug 27, 2021 at 03:15:25PM -0500, Mario Limonciello wrote:
> Some of the existing assumptions made do not scale properly
> to new silicon in upcoming changes.  This commit should cause
> no functional changes to existing silicon.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/k10temp.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index f6b325b8463e..159dbad73d82 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -65,10 +65,11 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>  #define F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET	0xd8200c64
>  #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET	0xd8200ca4
>  
> -/* Common for Zen CPU families (Family 17h and 18h) */
> -#define ZEN_REPORTED_TEMP_CTRL_OFFSET		0x00059800
> +/* Common for Zen CPU families (Family 17h and 18h and 19h) */
> +#define ZEN_REPORTED_TEMP_CTRL_BASE		0x00059800
>  
> -#define ZEN_CCD_TEMP(x)				(0x00059954 + ((x) * 4))
> +#define ZEN_CCD_TEMP(offset, x)			(ZEN_REPORTED_TEMP_CTRL_BASE + \
> +						 (offset) + ((x) * 4))
>  #define ZEN_CCD_TEMP_VALID			BIT(11)
>  #define ZEN_CCD_TEMP_MASK			GENMASK(10, 0)
>  
> @@ -103,6 +104,7 @@ struct k10temp_data {
>  	u32 temp_adjust_mask;
>  	u32 show_temp;
>  	bool is_zen;
> +	u32 ccd_offset;
>  };
>  
>  #define TCTL_BIT	0
> @@ -163,7 +165,7 @@ static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>  static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>  {
>  	amd_smn_read(amd_pci_dev_to_node_id(pdev),
> -		     ZEN_REPORTED_TEMP_CTRL_OFFSET, regval);
> +		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>  }
>  
>  static long get_raw_temp(struct k10temp_data *data)
> @@ -226,7 +228,8 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>  			break;
>  		case 2 ... 9:		/* Tccd{1-8} */
>  			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
> -				     ZEN_CCD_TEMP(channel - 2), &regval);
> +				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
> +						  &regval);
>  			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
>  			break;
>  		default:
> @@ -387,7 +390,7 @@ static void k10temp_get_ccd_support(struct pci_dev *pdev,
>  
>  	for (i = 0; i < limit; i++) {
>  		amd_smn_read(amd_pci_dev_to_node_id(pdev),
> -			     ZEN_CCD_TEMP(i), &regval);
> +			     ZEN_CCD_TEMP(data->ccd_offset, i), &regval);
>  		if (regval & ZEN_CCD_TEMP_VALID)
>  			data->show_temp |= BIT(TCCD_BIT(i));
>  	}
> @@ -433,12 +436,14 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		case 0x8:	/* Zen+ */
>  		case 0x11:	/* Zen APU */
>  		case 0x18:	/* Zen+ APU */
> +			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 4);
>  			break;
>  		case 0x31:	/* Zen2 Threadripper */
>  		case 0x60:	/* Renoir */
>  		case 0x68:	/* Lucienne */
>  		case 0x71:	/* Zen2 */
> +			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 8);
>  			break;
>  		}
> @@ -451,6 +456,7 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		case 0x0 ... 0x1:	/* Zen3 SP3/TR */
>  		case 0x21:		/* Zen3 Ryzen Desktop */
>  		case 0x50 ... 0x5f:	/* Green Sardine */
> +			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 8);
>  			break;
>  		}