mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 07:26:46 +07:00
f85b520510
w83792d was written by me in 2004, I'd like to update my first name into my current one to keep consistent, and delete invalid address. Signed-off-by: Shane Huang <shane.huang@amd.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
174 lines
5.9 KiB
Plaintext
174 lines
5.9 KiB
Plaintext
Kernel driver w83792d
|
||
=====================
|
||
|
||
Supported chips:
|
||
* Winbond W83792D
|
||
Prefix: 'w83792d'
|
||
Addresses scanned: I2C 0x2c - 0x2f
|
||
Datasheet: http://www.winbond.com.tw
|
||
|
||
Author: Shane Huang (Winbond)
|
||
|
||
|
||
Module Parameters
|
||
-----------------
|
||
|
||
* init int
|
||
(default 1)
|
||
Use 'init=0' to bypass initializing the chip.
|
||
Try this if your computer crashes when you load the module.
|
||
|
||
* force_subclients=bus,caddr,saddr,saddr
|
||
This is used to force the i2c addresses for subclients of
|
||
a certain chip. Example usage is `force_subclients=0,0x2f,0x4a,0x4b'
|
||
to force the subclients of chip 0x2f on bus 0 to i2c addresses
|
||
0x4a and 0x4b.
|
||
|
||
|
||
Description
|
||
-----------
|
||
|
||
This driver implements support for the Winbond W83792AD/D.
|
||
|
||
Detection of the chip can sometimes be foiled because it can be in an
|
||
internal state that allows no clean access (Bank with ID register is not
|
||
currently selected). If you know the address of the chip, use a 'force'
|
||
parameter; this will put it into a more well-behaved state first.
|
||
|
||
The driver implements three temperature sensors, seven fan rotation speed
|
||
sensors, nine voltage sensors, and two automatic fan regulation
|
||
strategies called: Smart Fan I (Thermal Cruise mode) and Smart Fan II.
|
||
Automatic fan control mode is possible only for fan1-fan3. Fan4-fan7 can run
|
||
synchronized with selected fan (fan1-fan3). This functionality and manual PWM
|
||
control for fan4-fan7 is not yet implemented.
|
||
|
||
Temperatures are measured in degrees Celsius and measurement resolution is 1
|
||
degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when
|
||
the temperature gets higher than the Overtemperature Shutdown value; it stays
|
||
on until the temperature falls below the Hysteresis value.
|
||
|
||
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
|
||
triggered if the rotation speed has dropped below a programmable limit. Fan
|
||
readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or
|
||
128) to give the readings more range or accuracy.
|
||
|
||
Voltage sensors (also known as IN sensors) report their values in millivolts.
|
||
An alarm is triggered if the voltage has crossed a programmable minimum
|
||
or maximum limit.
|
||
|
||
Alarms are provided as output from "realtime status register". Following bits
|
||
are defined:
|
||
|
||
bit - alarm on:
|
||
0 - in0
|
||
1 - in1
|
||
2 - temp1
|
||
3 - temp2
|
||
4 - temp3
|
||
5 - fan1
|
||
6 - fan2
|
||
7 - fan3
|
||
8 - in2
|
||
9 - in3
|
||
10 - in4
|
||
11 - in5
|
||
12 - in6
|
||
13 - VID change
|
||
14 - chassis
|
||
15 - fan7
|
||
16 - tart1
|
||
17 - tart2
|
||
18 - tart3
|
||
19 - in7
|
||
20 - in8
|
||
21 - fan4
|
||
22 - fan5
|
||
23 - fan6
|
||
|
||
Tart will be asserted while target temperature cannot be achieved after 3 minutes
|
||
of full speed rotation of corresponding fan.
|
||
|
||
In addition to the alarms described above, there is a CHAS alarm on the chips
|
||
which triggers if your computer case is open (This one is latched, contrary
|
||
to realtime alarms).
|
||
|
||
The chips only update values each 3 seconds; reading them more often will
|
||
do no harm, but will return 'old' values.
|
||
|
||
|
||
W83792D PROBLEMS
|
||
----------------
|
||
Known problems:
|
||
- This driver is only for Winbond W83792D C version device, there
|
||
are also some motherboards with B version W83792D device. The
|
||
calculation method to in6-in7(measured value, limits) is a little
|
||
different between C and B version. C or B version can be identified
|
||
by CR[0x49h].
|
||
- The function of vid and vrm has not been finished, because I'm NOT
|
||
very familiar with them. Adding support is welcome.
|
||
- The function of chassis open detection needs more tests.
|
||
- If you have ASUS server board and chip was not found: Then you will
|
||
need to upgrade to latest (or beta) BIOS. If it does not help please
|
||
contact us.
|
||
|
||
Fan control
|
||
-----------
|
||
|
||
Manual mode
|
||
-----------
|
||
|
||
Works as expected. You just need to specify desired PWM/DC value (fan speed)
|
||
in appropriate pwm# file.
|
||
|
||
Thermal cruise
|
||
--------------
|
||
|
||
In this mode, W83792D provides the Smart Fan system to automatically control
|
||
fan speed to keep the temperatures of CPU and the system within specific
|
||
range. At first a wanted temperature and interval must be set. This is done
|
||
via thermal_cruise# file. The tolerance# file serves to create T +- tolerance
|
||
interval. The fan speed will be lowered as long as the current temperature
|
||
remains below the thermal_cruise# +- tolerance# value. Once the temperature
|
||
exceeds the high limit (T+tolerance), the fan will be turned on with a
|
||
specific speed set by pwm# and automatically controlled its PWM duty cycle
|
||
with the temperature varying. Three conditions may occur:
|
||
|
||
(1) If the temperature still exceeds the high limit, PWM duty
|
||
cycle will increase slowly.
|
||
|
||
(2) If the temperature goes below the high limit, but still above the low
|
||
limit (T-tolerance), the fan speed will be fixed at the current speed because
|
||
the temperature is in the target range.
|
||
|
||
(3) If the temperature goes below the low limit, PWM duty cycle will decrease
|
||
slowly to 0 or a preset stop value until the temperature exceeds the low
|
||
limit. (The preset stop value handling is not yet implemented in driver)
|
||
|
||
Smart Fan II
|
||
------------
|
||
|
||
W83792D also provides a special mode for fan. Four temperature points are
|
||
available. When related temperature sensors detects the temperature in preset
|
||
temperature region (sf2_point@_fan# +- tolerance#) it will cause fans to run
|
||
on programmed value from sf2_level@_fan#. You need to set four temperatures
|
||
for each fan.
|
||
|
||
|
||
/sys files
|
||
----------
|
||
|
||
pwm[1-3] - this file stores PWM duty cycle or DC value (fan speed) in range:
|
||
0 (stop) to 255 (full)
|
||
pwm[1-3]_enable - this file controls mode of fan/temperature control:
|
||
* 0 Disabled
|
||
* 1 Manual mode
|
||
* 2 Smart Fan II
|
||
* 3 Thermal Cruise
|
||
pwm[1-3]_mode - Select PWM of DC mode
|
||
* 0 DC
|
||
* 1 PWM
|
||
thermal_cruise[1-3] - Selects the desired temperature for cruise (degC)
|
||
tolerance[1-3] - Value in degrees of Celsius (degC) for +- T
|
||
sf2_point[1-4]_fan[1-3] - four temperature points for each fan for Smart Fan II
|
||
sf2_level[1-3]_fan[1-3] - three PWM/DC levels for each fan for Smart Fan II
|