Hi
I have some doubts in order to set "target" frequency in cpu-frequency
driver. I gone through code which set
"target" CPU frequency and got details as below:
1. Core CPU frequency driver "target" function calls
(__cpufreq_driver_target) a platform specific "target"
functions(for e.g. exynos_target, davinci_target).
2. I observed some of problems in setting target frequency especially
when doing target freq > current frequency.
3. Consider an example of davinci frequency driver if want to set a
frequency higher than current frequency then
1. Firstly, set regulator voltage and if it fails
then return error.
2. Set clock rate and if it fails return error.
3. Consider a scenario that regulator works fine
while setting voltage but somehow "clk_set_rate"
fails then here is a bug, that CPU runs at
higher voltage even though that is not required.
I have not seen anywhere in code that regulator is brought back to
original voltage if CPU set rate for frequency
is failed. Am I missing something in code flow? or there is no need
to care about regulator voltage in such case.
Regards
Manish Badarkhe
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