From 425640256a7c5e9259f7583ee4eca1f3b70f8032 Mon Sep 17 00:00:00 2001 From: Tim Harvey Date: Wed, 8 Jul 2015 15:49:43 -0700 Subject: [PATCH] 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 Cc: Jason Liu Signed-off-by: Tim Harvey --- 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 42ca8d0..3c6c967 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);