linux-kernel - Re: [PATCH] thermal: int340x: processor

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Date:   Mon, 28 Jun 2021 14:59:03 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rui.zhang@...el.com,
        amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: int340x: processor_thermal: Fix tcc setting

On Mon, 2021-06-28 at 22:42 +0200, Daniel Lezcano wrote:
> On 28/06/2021 22:10, Srinivas Pandruvada wrote:
> > The following fixes are done for tcc sysfs interface:
> > - TCC is 6 bits only from bit 29-24
> > - TCC of 0 is valid
> > - When BIT(31) is set, this register is read only
> > - Check for invalid tcc value
> > - Error for negative values
> > 
> 
> Fixes: fdf4f2fb8e899 ("Export sysfs interface for TCC")
> 
> ?
Sent again with Fixes tag and cc stable.

Thanks,
Srinivas

> 
> > Signed-off-by: Srinivas Pandruvada <
> > srinivas.pandruvada@...ux.intel.com>
> > ---
> >  .../processor_thermal_device.c                | 20 +++++++++++----
> > ----
> >  1 file changed, 12 insertions(+), 8 deletions(-)
> > 
> > diff --git
> > a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > index de4fc640deb0..0f0038af2ad4 100644
> > ---
> > a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > +++
> > b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > @@ -78,24 +78,27 @@ static ssize_t
> > tcc_offset_degree_celsius_show(struct device *dev,
> >         if (err)
> >                 return err;
> >  
> > -       val = (val >> 24) & 0xff;
> > +       val = (val >> 24) & 0x3f;
> >         return sprintf(buf, "%d\n", (int)val);
> >  }
> >  
> > -static int tcc_offset_update(int tcc)
> > +static int tcc_offset_update(unsigned int tcc)
> >  {
> >         u64 val;
> >         int err;
> >  
> > -       if (!tcc)
> > +       if (tcc > 63)
> >                 return -EINVAL;
> >  
> >         err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val);
> >         if (err)
> >                 return err;
> >  
> > -       val &= ~GENMASK_ULL(31, 24);
> > -       val |= (tcc & 0xff) << 24;
> > +       if (val & BIT(31))
> > +               return -EPERM;
> > +
> > +       val &= ~GENMASK_ULL(29, 24);
> > +       val |= (tcc & 0x3f) << 24;
> >  
> >         err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
> >         if (err)
> > @@ -104,14 +107,15 @@ static int tcc_offset_update(int tcc)
> >         return 0;
> >  }
> >  
> > -static int tcc_offset_save;
> > +static unsigned int tcc_offset_save;
> >  
> >  static ssize_t tcc_offset_degree_celsius_store(struct device *dev,
> >                                 struct device_attribute *attr,
> > const char *buf,
> >                                 size_t count)
> >  {
> > +       unsigned int tcc;
> >         u64 val;
> > -       int tcc, err;
> > +       int err;
> >  
> >         err = rdmsrl_safe(MSR_PLATFORM_INFO, &val);
> >         if (err)
> > @@ -120,7 +124,7 @@ static ssize_t
> > tcc_offset_degree_celsius_store(struct device *dev,
> >         if (!(val & BIT(30)))
> >                 return -EACCES;
> >  
> > -       if (kstrtoint(buf, 0, &tcc))
> > +       if (kstrtouint(buf, 0, &tcc))
> >                 return -EINVAL;
> >  
> >         err = tcc_offset_update(tcc);
> > 
> 
>