linux-kernel - Re: [PATCH v3 2/7] drivers: regulator: qcom_spmi: Refactor get_mode/set

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Message-ID: <CAOCk7NpLz-6kM2X=HOh4ZcEw4bzhKcjd=8664HX43w1V+ffeag@mail.gmail.com>
Date:   Thu, 13 Jun 2019 09:37:38 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     lgirdwood@...il.com, broonie@...nel.org,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        MSM <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/7] drivers: regulator: qcom_spmi: Refactor get_mode/set_mode

On Thu, Jun 13, 2019 at 9:24 AM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Thu 13 Jun 08:12 PDT 2019, Bjorn Andersson wrote:
>
> > On Thu 13 Jun 07:22 PDT 2019, Jeffrey Hugo wrote:
> >
> > > spmi_regulator_common_get_mode and spmi_regulator_common_set_mode use
> > > multi-level ifs which mirror a switch statement.  Refactor to use a switch
> > > statement to make the code flow more clear.
> > >
> > > Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> > > ---
> > >  drivers/regulator/qcom_spmi-regulator.c | 28 ++++++++++++++++---------
> > >  1 file changed, 18 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c
> > > index fd55438c25d6..1c18fe5969b5 100644
> > > --- a/drivers/regulator/qcom_spmi-regulator.c
> > > +++ b/drivers/regulator/qcom_spmi-regulator.c
> > > @@ -911,13 +911,14 @@ static unsigned int spmi_regulator_common_get_mode(struct regulator_dev *rdev)
> > >
> > >     spmi_vreg_read(vreg, SPMI_COMMON_REG_MODE, &reg, 1);
> > >
> > > -   if (reg & SPMI_COMMON_MODE_HPM_MASK)
>
> Sorry, didn't see the & here. Don't you need to mask out the mode bits
> before turning this into a switch?

Ah.  Yes.  I read the documentation wrong when doing this.  Will fix.

>
> > > +   switch (reg) {
> > > +   case SPMI_COMMON_MODE_HPM_MASK:
> > >             return REGULATOR_MODE_NORMAL;
> > > -
> > > -   if (reg & SPMI_COMMON_MODE_AUTO_MASK)
> > > +   case SPMI_COMMON_MODE_AUTO_MASK:
> > >             return REGULATOR_MODE_FAST;
> > > -
> > > -   return REGULATOR_MODE_IDLE;
> > > +   default:
> > > +           return REGULATOR_MODE_IDLE;
> > > +   }
> > >  }
> > >
> > >  static int
> > > @@ -925,12 +926,19 @@ spmi_regulator_common_set_mode(struct regulator_dev *rdev, unsigned int mode)
> > >  {
> > >     struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
> > >     u8 mask = SPMI_COMMON_MODE_HPM_MASK | SPMI_COMMON_MODE_AUTO_MASK;
> > > -   u8 val = 0;
> > > +   u8 val;
> > >
> > > -   if (mode == REGULATOR_MODE_NORMAL)
> > > +   switch (mode) {
> > > +   case REGULATOR_MODE_NORMAL:
> > >             val = SPMI_COMMON_MODE_HPM_MASK;
> > > -   else if (mode == REGULATOR_MODE_FAST)
> > > +           break;
> > > +   case REGULATOR_MODE_FAST:
> > >             val = SPMI_COMMON_MODE_AUTO_MASK;
> > > +           break;
> > > +   default:
> > > +           val = 0;
> > > +           break;
> > > +   }
> >
> > For this part:
> > Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > >
> > >     return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_MODE, val, mask);
> > >  }
> > > @@ -1834,9 +1842,9 @@ static int qcom_spmi_regulator_probe(struct platform_device *pdev)
> > >                     }
> > >             }
> > >
> > > -           if (vreg->logical_type == SPMI_REGULATOR_LOGICAL_TYPE_HFS430) {
> >
> > Squash this into patch 1.
> >
> > Regards,
> > Bjorn
> >
> > > +           if (vreg->set_points->count == 1) {
> > >                     /* since there is only one range */
> > > -                   range = spmi_regulator_find_range(vreg);
> > > +                   range = vreg->set_points->range;
> > >                     vreg->desc.uV_step = range->step_uV;
> > >             }
> > >
> > > --
> > > 2.17.1
> > >