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thermal: ti-soc-thermal: freeze FSM while computing trend

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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@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Eduardo Valentin 2013-06-07 19:13:13 +00:00 committed by Zhang Rui
parent 359836e1de
commit ba0049eacc
1 changed files with 9 additions and 3 deletions
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12
drivers/thermal/ti-soc-thermal/ti-bandgap.c
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@ -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 +1011,25 @@ 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);
spin_unlock(&bgp->lock);
exit:
return ret;
}