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thermal: imx_thermal: fix busywait if IMX6 temp <0C 

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@freescale.com>
Cc: Jason Liu <r64343@freescale.com>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2015-07-08 15:49:43 -07:00 committed by Stefano Babic
parent 699279cac0
commit 425640256a
1 changed files with 1 additions and 1 deletions
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2
drivers/thermal/imx_thermal.c
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@ -115,7 +115,7 @@ static int read_cpu_temperature(struct udevice *dev)
writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
/* milli_Tmeas = c2 - Nmeas * c1 */ /* milli_Tmeas = c2 - Nmeas * c1 */
temperature = (c2 - n_meas * c1)/1000; temperature = (long)(c2 - n_meas * c1)/1000;
/* power down anatop thermal sensor */ /* power down anatop thermal sensor */
writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set); writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);