[PATCH 06/11] ARM: OMAP2+: Fix voltage scaling init for device tree

[Nishanth Menon]

On Mon, May 19, 2014 at 1:01 PM, Tony Lindgren <tony at atomide.com> wrote:
> * Joachim Eastwood <manabian at gmail.com> [140519 10:51]:
>> Hi Tony,
>>
>> If found this patch in your omap-for-v3.16/pm-signed tag and tested it
>> on top of Linus master + omap 3.16 dt + Tomi fbdev omap. I assumed
>> it's going upstream for 3.16(?).
>
> Yes.
>
>> First of all; is this safe on OMAP4460?
>> As far as I understand voltage scaling on 4460 has never been
>> mainline, but this code enables voltage scaling for all omap4 parts.
>> More below.
>
> Sounds like something's not right then. This should just restore
> the earlier code path we had for legacy booting for omap4.
>
>> On 11 April 2014 01:47, Tony Lindgren <tony at atomide.com> wrote:
>> > We are currently disabling the init of voltage scaling
>> > for device tree. With the voltage scaling problems fixed
>> > for omap3 in general, there's no need to disable the voltage
>> > scaling init for device tree based booting.
>> >
>> > Cc: Kevin Hilman <khilman at linaro.org>
>> > Cc: Nishanth Menon <nm at ti.com>
>> > Cc: Paul Walmsley <paul at pwsan.com>
>> > Cc: Tero Kristo <t-kristo at ti.com>
>> > Signed-off-by: Tony Lindgren <tony at atomide.com>
>> > ---
>> >  arch/arm/mach-omap2/pm.c | 28 ++++++++++++----------------
>> >  1 file changed, 12 insertions(+), 16 deletions(-)
>> >
>> > diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
>> > index e1b4141..ccefd11 100644
>> > --- a/arch/arm/mach-omap2/pm.c
>> > +++ b/arch/arm/mach-omap2/pm.c
>> > @@ -287,25 +287,21 @@ omap_postcore_initcall(omap2_common_pm_init);
>> >
>> >  int __init omap2_common_pm_late_init(void)
>> >  {
>> > -       /*
>> > -        * In the case of DT, the PMIC and SR initialization will be done using
>> > -        * a completely different mechanism.
>> > -        * Disable this part if a DT blob is available.
>> > -        */
>> > -       if (!of_have_populated_dt()) {
>> > -
>> > -               /* Init the voltage layer */
>> > -               omap_pmic_late_init();
>> > -               omap_voltage_late_init();
>> > +       if (of_have_populated_dt()) {
>> > +               omap3_twl_init();
>> > +               omap4_twl_init();
>> > +       }
>> >
>> > -               /* Initialize the voltages */
>> > -               omap3_init_voltages();
>> > -               omap4_init_voltages();
>> > +       /* Init the voltage layer */
>> > +       omap_pmic_late_init();
>> > +       omap_voltage_late_init();
>> >
>> > -               /* Smartreflex device init */
>> > -               omap_devinit_smartreflex();
>> > +       /* Initialize the voltages */
>> > +       omap3_init_voltages();
>> > +       omap4_init_voltages();
>> >
>> > -       }
>> > +       /* Smartreflex device init */
>> > +       omap_devinit_smartreflex();
>> >
>> >         /* cpufreq dummy device instantiation */
>> >         omap_init_cpufreq();
>> > --
>>
>> In omap4_twl_init() we have:
>> if (!cpu_is_omap44xx())
>>     return -ENODEV;
>>
>> voltdm = voltdm_lookup("mpu");
>> omap_voltage_register_pmic(voltdm, &omap4_mpu_pmic);
>>
>> voltdm = voltdm_lookup("iva");
>> omap_voltage_register_pmic(voltdm, &omap4_iva_pmic);
>>
>> voltdm = voltdm_lookup("core");
>> omap_voltage_register_pmic(voltdm, &omap4_core_pmic);
>>
>> As far as I understand the setup above is only valid for 4430 and not
>> 4460 since it is hook up to the twl in diffent way. External switcher
>> (TPS62361) for mpu rail and the other rails are used differently.
>
> Hmm interesting, I think we had this enabled with legacy booting?
>
>> I also get the following messages on boot now:
>> [ 2.458740] twl: not initialized
>> [ 2.462127] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1375000 Vs max 1316660
>> [ 2.470581] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1375000 Vs max 1316660
>> [ 2.479003] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1375000 Vs max 1316660
>> [ 2.487457] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1375000 Vs max 1316660
>> [ 2.495880] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1375000 Vs max 1316660
>> [ 2.504302] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1375000 Vs max 1316660
>> [ 2.512725] twl6030_uv_to_vsel:OUT OF RANGE! non mapped vsel for
>> 1410000 Vs max 1316660
>> [ 2.521179] omap2_set_init_voltage: unable to find boot up OPP for vdd_mpu
>> [ 2.528411] omap2_set_init_voltage: unable to set vdd_mpu
>> [ 2.534088] omap2_set_init_voltage: unable to find boot up OPP for vdd_core
>> [ 2.541412] omap2_set_init_voltage: unable to set vdd_core
>> [ 2.547210] omap2_set_init_voltage: unable to find boot up OPP for vdd_iva
>> [ 2.554443] omap2_set_init_voltage: unable to set vdd_iva
>>
>> It doesn't seem too happy on my 4460.
>
> Indeed, we need to fix it. Nishant, any comments on how we should
> deal with this one?



we can add TPS data here for 4460 mpu (panda-ES) if that is
interesting to us - given that the common voltage domain/VC/VP stuff
so far has gone in no positive direction in our discussions last year.

Regards,
Nishanth Menon