From a85fd2c8fdefa0d504882f0e110d68e564903fcb Mon Sep 17 00:00:00 2001 From: Eduardo Valentin Date: Wed, 24 Apr 2013 14:16:08 -0400 Subject: [PATCH] staging: 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. Signed-off-by: Eduardo Valentin Signed-off-by: Greg Kroah-Hartman --- .../ti-soc-thermal/ti-thermal-common.c | 30 ++++++++++++------- 1 file changed, 20 insertions(+), 10 deletions(-) diff --git a/drivers/staging/ti-soc-thermal/ti-thermal-common.c b/drivers/staging/ti-soc-thermal/ti-thermal-common.c index e3c5e677eaa5..8e67ebf98404 100644 --- a/drivers/staging/ti-soc-thermal/ti-thermal-common.c +++ b/drivers/staging/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; -- 2.34.1