[Letux-kernel] letux-4.7-rc7: charging & ethernet gadget

H. Nikolaus Schaller hns at goldelico.com
Wed Jul 20 11:17:19 CEST 2016


Hi Andreas,

> 
>> [   60.034973] twl4030 REG_BCICTL1 = 12
>> [   60.046569] twl4030 REG_BCICTL2 = 00
>> [   60.061920] twl4030 current = 10 uA
>> [   60.074676] twl4030 res = 0 Ohm
>> [   60.089141] twl4030 temp = 59 C
>> temp: 56°C
> 
> This means ITHEN is disabled after boot! For whatever reasons. 

I can't even set the ITHEN bit!

[  279.510040] twl4030_madc_set_current_generator read regval = 12
[  279.517547] twl4030_madc_set_current_generator write regval = 1a
[  279.527343] twl4030_madc_set_current_generator read back regval = 12

manually:

root at letux:~# i2cget -f 0 0x4a 0x97 
0x12
root at letux:~# i2cset -f 0 0x4a 0x97 0x1f 
root at letux:~# i2cget -f 0 0x4a 0x97 
0x13
root at letux:~# i2cset -f 0 0x4a 0x97 0x00 
root at letux:~# i2cget -f 0 0x4a 0x97 
0x00
root at letux:~# i2cset -f 0 0x4a 0x97 0xff
root at letux:~# i2cget -f 0 0x4a 0x97 
0x13
root at letux:~# 

So I can only toggle the TYPEN (ADCIN0), MESBAT, MESVAC bits
in the state the twl4030 is initialized.

But not ITHEN (ADCIN1) or MESVBUS.

here we have a connection between VBUS and Temp measurements...

Description says:

MESVBUS  Connects resistive divider VBUS input
Note: MESVBUS is enabled automatically when VBUSOVEN monitoring function is started.

This might also imply that it is automatically reset at some times.

But there is no note about automatic control of ITHEN.

Any ideas? Some background process resetting these bits instead of leaving them untouched?

Next, I think I will compare with the 4.3 kernel on the same device.

BR,
Nikolaus


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