[U-Boot] [PATCH] thermal: imx_thermal: fix busywait if IMX6 temp <0C

[Tim Harvey]

The temperature calculation must be typecasted to keep the compiler
from sign extending a negative value prior to division.

This fixes an issue where if the CPU temperature is <0C it will get stuck
in the busywait loop until the CPU heats up to 0C.

Cc: Ye Li <b37916 at freescale.com>
Cc: Jason Liu <r64343 at freescale.com>
Signed-off-by: Tim Harvey <tharvey at gateworks.com>
---
 drivers/thermal/imx_thermal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index 0d893c9..6d1ac97 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -115,7 +115,7 @@ static int read_cpu_temperature(struct udevice *dev)
 	writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
 
 	/* milli_Tmeas = c2 - Nmeas * c1 */
-	temperature = (c2 - n_meas * c1)/1000;
+	temperature = (long)(c2 - n_meas * c1)/1000;
 
 	/* power down anatop thermal sensor */
 	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
-- 
1.9.1