Re: Nokia N900 - audio TPA6130A2 problems

[Ivaylo Dimitrov]

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