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Message-ID: <4585ec62-b7bb-9f2a-eee0-07032648e55a@roeck-us.net>
Date: Mon, 19 Jun 2023 10:07:17 -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
Subject: Re: [PATCH v3] hwmon: (k10temp) Enable AMD3255 Proc to show negative
temperature
On 6/19/23 09:54, Baskaran Kannan wrote:
> Industrial processor i3255 supports temperatures -40 deg celcius
> to 105 deg Celcius. The current implementation of k10temp_read_temp
> rounds off any negative
> temperatures to '0'. To fix this, the following changes have been made.
> Added a flag 'disp_negative' to struct k10temp_data to support
> AMD i3255 processors. Flag 'disp_negative' is set if 3255 processor
> is found during k10temp_probe. Flag 'disp_negative' is used to determine
> whether to round off negative temperatures to '0' in k10temp_read_temp.
>
> Signed-off-by: Baskaran Kannan <Baski.Kannan@....com>
Now you have made changes you were not asked to make, extended the flag
to cover a range of processors instead of just i3255, and did not provide
a change log nor a comment in the code describing why processors with
certain model numbers should display negative temperatures.
Guenter
> ---
> drivers/hwmon/k10temp.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index 7b177b9fbb09..2613420d43ff 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -86,6 +86,7 @@ struct k10temp_data {
> u32 show_temp;
> bool is_zen;
> u32 ccd_offset;
> + bool disp_negative;
> };
>
> #define TCTL_BIT 0
> @@ -204,12 +205,12 @@ 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)
> + if (*val < 0 && !data->disp_negative)
> *val = 0;
> break;
> case 1: /* Tdie */
> *val = get_raw_temp(data) - data->temp_offset;
> - if (*val < 0)
> + if (*val < 0 && !data->disp_negative)
> *val = 0;
> break;
> case 2 ... 13: /* Tccd{1-12} */
> @@ -405,6 +406,9 @@ 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 && boot_cpu_data.x86_model < 0x8)
> + data->disp_negative = true;
> +
> if (boot_cpu_data.x86 == 0x15 &&
> ((boot_cpu_data.x86_model & 0xf0) == 0x60 ||
> (boot_cpu_data.x86_model & 0xf0) == 0x70)) {
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