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From:   Adam Ford <aford173@gmail.com>
Date:   Mon, 9 Sep 2019 08:32:06 -0500
Message-ID: <CAHCN7xJ0RmRQwo3bSF6FoLjOtrg5YZAMD9+=332LMzLLR1qdDA@mail.gmail.com>
Subject: Re: [PATCH v2] regulator: twl: voltage lists for vdd1/2 on twl4030
To:     Andreas Kemnade <andreas@kemnade.info>
Cc:     Tony Lindgren <tony@atomide.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Linux-OMAP <linux-omap@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-pm@vger.kernel.org, Stephen Boyd <sboyd@kernel.org>,
        Nishanth Menon <nm@ti.com>, vireshk@kernel.org,
        stable@vger.kernel.org
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On Thu, Aug 15, 2019 at 5:47 AM Adam Ford <aford173@gmail.com> wrote:
>
> On Wed, Aug 14, 2019 at 5:18 PM Andreas Kemnade <andreas@kemnade.info> wrote:
> >
> > _opp_supported_by_regulators() wrongly ignored errors from
> > regulator_is_supported_voltage(), so it considered errors as
> > success. Since
> > commit 498209445124 ("regulator: core: simplify return value on suported_voltage")
> > regulator_is_supported_voltage() returns a real boolean, so
> > errors make _opp_supported_by_regulators() return false.
> >
> > That reveals a problem with the declaration of the VDD1/2
> > regulators on twl4030.
> > The VDD1/VDD2 regulators on twl4030 are neither defined with
> > voltage lists nor with the continuous flag set, so
> > regulator_is_supported_voltage() returns false and an error
> > before above mentioned commit (which was considered success)
> > The result is that after the above mentioned commit cpufreq
> > does not work properly e.g. dm3730.
> >
> > [    2.490997] core: _opp_supported_by_regulators: OPP minuV: 1012500 maxuV: 1012500, not supported by regulator
> > [    2.501617] cpu cpu0: _opp_add: OPP not supported by regulators (300000000)
> > [    2.509246] core: _opp_supported_by_regulators: OPP minuV: 1200000 maxuV: 1200000, not supported by regulator
> > [    2.519775] cpu cpu0: _opp_add: OPP not supported by regulators (600000000)
> > [    2.527313] core: _opp_supported_by_regulators: OPP minuV: 1325000 maxuV: 1325000, not supported by regulator
> > [    2.537750] cpu cpu0: _opp_add: OPP not supported by regulators (800000000)
> >
> > The patch fixes declaration of VDD1/2 regulators by
> > adding proper voltage lists.
> >
> > Fixes: 498209445124 ("regulator: core: simplify return value on suported_voltage")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
>
> Tested-by: Adam Ford <aford173@gmail.com> #logicpd-torpedo-37xx-devkit
>

I am not sure who the right maintainer is, but as of today, cpufreq
for users of twl4030 on 5.3-RC8 is still broken without this patch.
Is there any way it can be applied before the final release?

thank you,

adam
> > ---
> > resent because it was rejected by mailing lists, due to technical
> > issues, sorry for the noise.
> > changes in v2:
> >   using a proper voltage list instead of misusing the continuous flag
> >   subject was regulator: twl: mark vdd1/2 as continuous on twl4030
> >
> >  drivers/regulator/twl-regulator.c | 23 ++++++++++++++++++++---
> >  1 file changed, 20 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
> > index 6fa15b2d6fb3..866b4dd01da9 100644
> > --- a/drivers/regulator/twl-regulator.c
> > +++ b/drivers/regulator/twl-regulator.c
> > @@ -359,6 +359,17 @@ static const u16 VINTANA2_VSEL_table[] = {
> >         2500, 2750,
> >  };
> >
> > +/* 600mV to 1450mV in 12.5 mV steps */
> > +static const struct regulator_linear_range VDD1_ranges[] = {
> > +       REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500)
> > +};
> > +
> > +/* 600mV to 1450mV in 12.5 mV steps, everything above = 1500mV */
> > +static const struct regulator_linear_range VDD2_ranges[] = {
> > +       REGULATOR_LINEAR_RANGE(600000, 0, 68, 12500),
> > +       REGULATOR_LINEAR_RANGE(1500000, 69, 69, 12500)
> > +};
> > +
> >  static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
> >  {
> >         struct twlreg_info      *info = rdev_get_drvdata(rdev);
> > @@ -427,6 +438,8 @@ static int twl4030smps_get_voltage(struct regulator_dev *rdev)
> >  }
> >
> >  static const struct regulator_ops twl4030smps_ops = {
> > +       .list_voltage   = regulator_list_voltage_linear_range,
> > +
> >         .set_voltage    = twl4030smps_set_voltage,
> >         .get_voltage    = twl4030smps_get_voltage,
> >  };
> > @@ -466,7 +479,8 @@ static const struct twlreg_info TWL4030_INFO_##label = { \
> >                 }, \
> >         }
> >
> > -#define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf) \
> > +#define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf, \
> > +               n_volt) \
> >  static const struct twlreg_info TWL4030_INFO_##label = { \
> >         .base = offset, \
> >         .id = num, \
> > @@ -479,6 +493,9 @@ static const struct twlreg_info TWL4030_INFO_##label = { \
> >                 .owner = THIS_MODULE, \
> >                 .enable_time = turnon_delay, \
> >                 .of_map_mode = twl4030reg_map_mode, \
> > +               .n_voltages = n_volt, \
> > +               .n_linear_ranges = ARRAY_SIZE(label ## _ranges), \
> > +               .linear_ranges = label ## _ranges, \
> >                 }, \
> >         }
> >
> > @@ -518,8 +535,8 @@ TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
> >  TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
> >  TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
> >  TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
> > -TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08);
> > -TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08);
> > +TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08, 68);
> > +TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08, 69);
> >  /* VUSBCP is managed *only* by the USB subchip */
> >  TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
> >  TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
> > --
> > 2.20.1
> >