Touchscreen failure with CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND

[Fabio Estevam]

Hi,

Running 4.11-rc7 on a imx6q-sabresd board I notice that egalax
touchscreen stops generating evtest events after a random period of
time.

This problem can be avoided if I unselect CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND:

--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig
@@ -54,7 +54,6 @@ CONFIG_CMA=y
 CONFIG_CMDLINE="noinitrd console=ttymxc0,115200"
 CONFIG_KEXEC=y
 CONFIG_CPU_FREQ=y
-CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
 CONFIG_ARM_IMX6Q_CPUFREQ=y
 CONFIG_CPU_IDLE=y
 CONFIG_VFP=y

With this change evtest always capture all touchscreen events. No
single failure is seen.

I could see the same behavior with all mainline kernels I tested (4.9 and 4.10).

Any ideas as to how fix this bug when CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y?

Thanks