From mboxrd@z Thu Jan 1 00:00:00 1970 From: viresh.kumar@linaro.org (Viresh Kumar) Date: Mon, 24 Apr 2017 17:13:43 +0530 Subject: Touchscreen failure with CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND In-Reply-To: References: <20170424040709.GG26900@vireshk-i7> <20170424112906.GR26900@vireshk-i7> Message-ID: <20170424114343.GS26900@vireshk-i7> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 24-04-17, 08:37, Fabio Estevam wrote: > On Mon, Apr 24, 2017 at 8:29 AM, Viresh Kumar wrote: > > > So clearly the system isn't changing the frequency a lot here and you stayed at > > the min freq for ever. Please give output of this as well: > > > > grep . /sys/devices/system/cpu/cpufreq/ondemand/* > > # grep . /sys/devices/system/cpu/cpufreq/ondemand/* > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load:0 > /sys/devices/system/cpu/cpufreq/ondemand/io_is_busy:0 > /sys/devices/system/cpu/cpufreq/ondemand/min_sampling_rate:10000 > /sys/devices/system/cpu/cpufreq/ondemand/powersave_bias:0 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor:1 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate:109000 110 ms is your sampling rate right now. Looks too high. Try doing this: echo 10000 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate and retry your tests. > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold:95 > > > I am also worried if the interrupts from the touchscreen will be enough to boost > > the frequency of the CPU ? > > It does not seem that the interrupts from the touchscreen boost the > frequency of the CPU. > > When I keep touching the panel, the CPU frequency stays at 396 MHz. > > Thanks -- viresh