linux-kernel - Re: [PATCH 3/7] thermal: ti-soc-thermal: freeze FSM while computing trend

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Date:	Fri, 7 Jun 2013 15:10:51 -0400
From:	Eduardo Valentin <eduardo.valentin@...com>
To:	Eduardo Valentin <eduardo.valentin@...com>
CC:	<rui.zhang@...el.com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] thermal: ti-soc-thermal: freeze FSM while computing
 trend

On 29-05-2013 11:07, Eduardo Valentin wrote:
> In order to read the history buffer, it is required to
> freeze BG FSM. This patch adds the missing piece of code
> to freeze the FSM and also a contention area to avoid
> other parts of the code to access the DTEMPs.
> 
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>
> ---
>  drivers/thermal/ti-soc-thermal/ti-bandgap.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> index f20c1cf..be9dba5 100644
> --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> @@ -992,9 +992,12 @@ int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)
>  		goto exit;
>  	}
>  
> +	spin_lock(&bgp->lock);
> +
>  	tsr = bgp->conf->sensors[id].registers;
>  
>  	/* Freeze and read the last 2 valid readings */
> +	RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1);
>  	reg1 = tsr->ctrl_dtemp_1;
>  	reg2 = tsr->ctrl_dtemp_2;
>  
> @@ -1008,22 +1011,26 @@ int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)
>  	/* Convert from adc values to mCelsius temperature */
>  	ret = ti_bandgap_adc_to_mcelsius(bgp, temp1, &t1);
>  	if (ret)
> -		goto exit;
> +		goto unfreeze;
>  
>  	ret = ti_bandgap_adc_to_mcelsius(bgp, temp2, &t2);
>  	if (ret)
> -		goto exit;
> +		goto unfreeze;
>  
>  	/* Fetch the update interval */
>  	ret = ti_bandgap_read_update_interval(bgp, id, &interval);
>  	if (ret || !interval)
> -		goto exit;
> +		goto unfreeze;
>  
>  	*trend = (t1 - t2) / interval;
>  
>  	dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n",
>  		t1, t2, *trend);
>  
> +unfreeze:
> +	RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0);
> +unlock:

This label is unused. I will repost this patch only without this label.

> +	spin_unlock(&bgp->lock);
>  exit:
>  	return ret;
>  }
> 


-- 
You have got to be excited about what you are doing. (L. Lamport)

Eduardo Valentin


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