linux-kernel - Re: [PATCH] thermal: intel_pch_thermal: Read large temp values correctly

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Date:   Sat, 29 Jul 2017 12:28:28 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Ed Swierk <eswierk@...portsystems.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: intel_pch_thermal: Read large temp values
 correctly

On Wed, 2017-07-19 at 17:47 -0700, Ed Swierk wrote:
> On all supported platforms, the TS Reading (TSR) field in the
> Temperature (TEMP) register is 9 bits wide. Values above 0x100 (78
> degrees C) are plausible, so don't mask out the topmost bit. And the
> register itself is 16 bits wide, so use readw() rather than readl().
> 
> Signed-off-by: Ed Swierk <eswierk@...portsystems.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

> ---
>  drivers/thermal/intel_pch_thermal.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/intel_pch_thermal.c
> b/drivers/thermal/intel_pch_thermal.c
> index 9889c90..318fc1b 100644
> --- a/drivers/thermal/intel_pch_thermal.c
> +++ b/drivers/thermal/intel_pch_thermal.c
> @@ -49,7 +49,7 @@
>  #define WPT_TSGPEN	0x84	/* General Purpose Event
> Enables */
>  
>  /*  Wildcat Point-LP  PCH Thermal Register bit definitions */
> -#define WPT_TEMP_TSR	0x00ff	/* Temp TS Reading */
> +#define WPT_TEMP_TSR	0x01ff	/* Temp TS Reading */
>  #define WPT_TSC_CPDE	0x01	/* Catastrophic Power-Down
> Enable */
>  #define WPT_TSS_TSDSS	0x10	/* Thermal Sensor Dynamic
> Shutdown Status */
>  #define WPT_TSS_GPES	0x08	/* GPE status */
> @@ -174,9 +174,9 @@ static int pch_wpt_init(struct pch_thermal_device
> *ptd, int *nr_trips)
>  
>  static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int
> *temp)
>  {
> -	u8 wpt_temp;
> +	u16 wpt_temp;
>  
> -	wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
> +	wpt_temp = WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP);
>  
>  	/* Resolution of 1/2 degree C and an offset of -50C */
>  	*temp = (wpt_temp * 1000 / 2 - 50000);