Re: [PATCH] regulator: core: Pass max_uV value to regulator_set_voltage_rdev

[Dmitry Osipenko]

On 7/2/18 11:05 AM, Tony Lindgren wrote:
> * Maciej Purski <m.purski@xxxxxxxxxxx> [180618 14:11]:
>> If the regulator is not coupled, balance_voltage() should preserve
>> its desired max uV, instead of setting the exact value like in
>> coupled regulators case.
>>
>> Remove debugs, which are not necessary for now.
> 
> Sorry for the delay in testing. I gave your series with this one
> a quick boot test on beagleboard-x15 and now the output is
> different. So instead of just hanging it seems to be stuck in
> some eternal loop see below.

Hello guys,

I'm working on the CPUFreq driver for NVIDIA Tegra and it requires the coupled-regulators functionality, hence I'm interested in getting the coupled regulators series finalized ASAP and want to help with it.

It looks to me that the infinite-loop problem is caused by the voltage value that is getting rounded-up by the driver because it isn't aligned to the uV_step. IIUC, uV_step is relevant only for the "linear" regulators and hence we can't simply set the best_delta to uV_step to solve the problem. Other solution could be to bail out of the loop once regulator sets value equal to the "desired".

Tony, could you please give a try to the patch below?

Do the following:

1) git cherry-pick 696861761a58d8c93605b5663824929fb6540f16
2) git cherry-pick 456e7cdf3b1a14e2606b8b687385ab2e3f23a49a
3) Apply this patch: