summaryrefslogtreecommitdiffstats
path: root/drivers/thermal
diff options
context:
space:
mode:
authorEduardo Valentin <eduardo.valentin@ti.com>2013-05-29 15:07:41 +0000
committerZhang Rui <rui.zhang@intel.com>2013-06-13 10:12:22 +0800
commit359836e1de4d32a647bf2c1f99d84d2ff0a098bd (patch)
treeaa9e1067d010db8645d3e493270339a9600d748e /drivers/thermal
parent0c1569590a6f14130b3660241580036176dba718 (diff)
downloadlinux-359836e1de4d32a647bf2c1f99d84d2ff0a098bd.tar.bz2
thermal: ti-soc-thermal: remove external heat while extrapolating hotspot
For boards that provide a PCB sensor close to SoC junction temperature, it is possible to remove the cumulative heat reported by the SoC temperature sensor. This patch changes the extrapolation computation to consider an external sensor in the extrapolation equations. 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-thermal-common.c30
1 files changed, 20 insertions, 10 deletions
diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
index e3c5e677eaa5..8e67ebf98404 100644
--- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
+++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
@@ -38,6 +38,7 @@
/* common data structures */
struct ti_thermal_data {
struct thermal_zone_device *ti_thermal;
+ struct thermal_zone_device *pcb_tz;
struct thermal_cooling_device *cool_dev;
struct ti_bandgap *bgp;
enum thermal_device_mode mode;
@@ -77,10 +78,12 @@ static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
+ struct thermal_zone_device *pcb_tz = NULL;
struct ti_thermal_data *data = thermal->devdata;
struct ti_bandgap *bgp;
const struct ti_temp_sensor *s;
- int ret, tmp, pcb_temp, slope, constant;
+ int ret, tmp, slope, constant;
+ unsigned long pcb_temp;
if (!data)
return 0;
@@ -92,16 +95,22 @@ static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
if (ret)
return ret;
- pcb_temp = 0;
- /* TODO: Introduce pcb temperature lookup */
+ /* Default constants */
+ slope = s->slope;
+ constant = s->constant;
+
+ pcb_tz = data->pcb_tz;
/* In case pcb zone is available, use the extrapolation rule with it */
- if (pcb_temp) {
- tmp -= pcb_temp;
- slope = s->slope_pcb;
- constant = s->constant_pcb;
- } else {
- slope = s->slope;
- constant = s->constant;
+ if (!IS_ERR_OR_NULL(pcb_tz)) {
+ ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
+ if (!ret) {
+ tmp -= pcb_temp; /* got a valid PCB temp */
+ slope = s->slope_pcb;
+ constant = s->constant_pcb;
+ } else {
+ dev_err(bgp->dev,
+ "Failed to read PCB state. Using defaults\n");
+ }
}
*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
@@ -273,6 +282,7 @@ static struct ti_thermal_data
data->sensor_id = id;
data->bgp = bgp;
data->mode = THERMAL_DEVICE_ENABLED;
+ data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
INIT_WORK(&data->thermal_wq, ti_thermal_work);
return data;