diff options
| author | Baskaran Kannan <Baski.Kannan@amd.com> | 2023-07-27 11:21:59 -0500 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2023-07-27 09:41:07 -0700 |
| commit | e146503ac68418859fb063a3a0cd9ec93bc52238 (patch) | |
| tree | d3cb447724982f30fe60b1cb5446e1a3682b4d07 /drivers | |
| parent | b84000f2274520f73ac9dc59fd9403260b61c4e7 (diff) | |
hwmon: (k10temp) Enable AMD3255 Proc to show negative temperature
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: aef17ca12719 ("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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/k10temp.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c index 7b177b9fbb09..a267b11731a8 100644 --- a/drivers/hwmon/k10temp.c +++ b/drivers/hwmon/k10temp.c @@ -77,6 +77,13 @@ 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. + * 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); @@ -86,6 +93,7 @@ struct k10temp_data { u32 show_temp; bool is_zen; u32 ccd_offset; + bool disp_negative; }; #define TCTL_BIT 0 @@ -204,12 +212,12 @@ 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 +413,11 @@ 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)) { |