Re: Nokia N900 - audio TPA6130A2 problems

Ivaylo Dimitrov
2016-03-19T08:50:29Z

Hi,

On 18.03.2016 17:04, Sebastian Reichel wrote:
> Hi,
>
> On Fri, Mar 18, 2016 at 03:45:26PM +0200, Ivaylo Dimitrov wrote:
>> On 18.03.2016 15:36, Sebastian Reichel wrote:
>>
>>
>> Regulator is V28_A, which is always-on, so it is enabled no matter what
>> probe does. Anyway, I added a various delays after regulator_enable(), to no
>> success.
>

I guess we're getting closer - I put some printks in various functions
in the twl-regulator.c, here is the result:

on power-up:

[ 2.378601] twl4030ldo_get_voltage_sel VMMC2 vsel 0x00000008
[ 2.384948] twl4030reg_enable VMMC2 grp 0x00000020
[ 2.408416] twl4030ldo_get_voltage_sel VMMC2 vsel 0x00000008
[ 7.196685] twl4030reg_is_enabled VMMC2 state 0x0000002e
[ 7.202819] twl4030reg_is_enabled VMMC2 state 0x0000002e
[ 7.209777] twl4030reg_is_enabled VMMC2 state 0x0000002e
[ 7.215728] twl4030reg_is_enabled VMMC2 state 0x0000002e
[ 7.223205] twl4030reg_is_enabled VMMC2 state 0x0000002e

after restart from stock kernel:

[ 2.388610] twl4030ldo_get_voltage_sel VMMC2 vsel 0x0000000a
[ 2.394958] twl4030reg_enable VMMC2 grp 0x00000028
[ 2.418426] twl4030ldo_get_voltage_sel VMMC2 vsel 0x0000000a
[ 7.186645] twl4030reg_is_enabled VMMC2 state 0x00000020
[ 7.192718] twl4030reg_is_enabled VMMC2 state 0x00000020
[ 7.199615] twl4030reg_is_enabled VMMC2 state 0x00000020
[ 7.205535] twl4030reg_is_enabled VMMC2 state 0x00000020
[ 7.212951] twl4030reg_is_enabled VMMC2 state 0x00000020

I don't see twl4030ldo_set_voltage_sel() for VMMC2(V28_A) regulator,
though there are calls for VMMC1 and VAUX3.

So, it seems to me that V28_A is not enabled or correctly set-up and all
devices connected to it does not function. And it looks like even after
power-on VMMC2 is not correctly set-up - it is supposed to have voltage
of 2.85V (10) but kernel leaves it to 2.60V (8). However my twl-fu ends
here so any help is appreciated.

Ivo