linux-kernel - [PATCH 2/2] staging: ti-soc-thermal: remove external heat while extrapolating hotspot

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Date:	Fri, 22 Mar 2013 17:13:07 -0400
From:	Eduardo Valentin <eduardo.valentin@...com>
To:	Zhang Rui <rui.zhang@...el.com>
CC:	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: [PATCH 2/2] 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 <eduardo.valentin@...com>
---
 drivers/staging/ti-soc-thermal/ti-thermal-common.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/ti-soc-thermal/ti-thermal-common.c b/drivers/staging/ti-soc-thermal/ti-thermal-common.c
index 231c549..52d3c1b 100644
--- a/drivers/staging/ti-soc-thermal/ti-thermal-common.c
+++ b/drivers/staging/ti-soc-thermal/ti-thermal-common.c
@@ -92,10 +92,9 @@ static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
 	if (ret)
 		return ret;
 
-	pcb_temp = 0;
-	/* TODO: Introduce pcb temperature lookup */
+	ret = thermal_zone_lookup_temperature("pcb", &pcb_temp);
 	/* In case pcb zone is available, use the extrapolation rule with it */
-	if (pcb_temp) {
+	if (!ret) {
 		tmp -= pcb_temp;
 		slope = s->slope_pcb;
 		constant = s->constant_pcb;
-- 
1.7.7.1.488.ge8e1c

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