diff mbox series

thermal: int340x: processor_thermal: Fix tcc setting

Message ID 20210628201012.68642-1-srinivas.pandruvada@linux.intel.com
State Accepted
Commit fe6a6de6692e7f7159c1ff42b07ecd737df712b4
Headers show
Series thermal: int340x: processor_thermal: Fix tcc setting | expand

Commit Message

Srinivas Pandruvada June 28, 2021, 8:10 p.m. UTC
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

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 .../processor_thermal_device.c                | 20 +++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

Comments

Srinivas Pandruvada June 28, 2021, 9:59 p.m. UTC | #1
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@linux.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);
> > 
> 
>
diff mbox series

Patch

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);