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authorEduardo Valentin <eduardo.valentin@ti.com>2013-06-07 19:13:13 +0000
committerZhang Rui <rui.zhang@intel.com>2013-06-13 10:13:52 +0800
commitba0049eacc59831f4018060dc30fb7c818421a75 (patch)
treed347e21bde9940c3e1cd593d575846762e665bd0 /drivers/thermal
parent359836e1de4d32a647bf2c1f99d84d2ff0a098bd (diff)
downloadlinux-ba0049eacc59831f4018060dc30fb7c818421a75.tar.bz2
thermal: ti-soc-thermal: freeze FSM while computing trend
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>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/ti-soc-thermal/ti-bandgap.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
index f20c1cfe9800..219c051d2e68 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 +1011,25 @@ 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;
}