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hwmon: (k10temp) Enable AMD3255 Proc to show negative temperature

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commit e146503ac6 upstream.

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.

A flag 'disp_negative' is added 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@amd.com>
Link: https://lore.kernel.org/r/20230727162159.1056136-1-Baski.Kannan@amd.com
Fixes: aef17ca127 ("hwmon: (k10temp) Only apply temperature offset if result is positive")
Cc: stable@vger.kernel.org
[groeck: Fixed multi-line comment]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baskaran Kannan 2023-07-27 11:21:59 -05:00 committed by Greg Kroah-Hartman
parent a676ddc4ca
commit 3f3cdca844
1 changed files with 15 additions and 2 deletions
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17
drivers/hwmon/k10temp.c
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@ -97,6 +97,13 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
#define F19H_M01H_CFACTOR_ICORE 1000000 /* 1A / LSB */
#define F19H_M01H_CFACTOR_ISOC 310000 /* 0.31A / LSB */
/*
* AMD's Industrial processor 3255 supports temperature from -40 deg to 105 deg Celsius.
* Use the model name to identify 3255 CPUs and set a flag to display negative temperature.
* Do not round off to zero for negative Tctl or Tdie values if the flag is set
*/
#define AMD_I3255_STR "3255"
struct k10temp_data {
struct pci_dev *pdev;
void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
@ -106,6 +113,7 @@ struct k10temp_data {
u32 show_temp;
bool is_zen;
u32 ccd_offset;
bool disp_negative;
};
#define TCTL_BIT 0
@ -220,12 +228,12 @@ 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 ... 9: /* Tccd{1-8} */
@ -417,6 +425,11 @@ 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)) {