Re: [PATCH 2/2] OPP: Fix missing debugfs supply directory for OPPs

From: Quentin Perret
Date: Tue Dec 11 2018 - 08:48:41 EST

On Tuesday 11 Dec 2018 at 16:56:29 (+0530), Viresh Kumar wrote:
> There is one case where we may end up with no "supply" directory for the
> OPPs in debugfs. That happens when the OPP core isn't managing the
> regulators for the device and the device's OPP do have microvolt
> property. It happens because the opp_table->regulator_count remains set
> to 0 and the debugfs routines don't add any supply directory in such a
> case.
> This commit fixes that by setting opp_table->regulator_count to 1 in
> that particular case. But to make everything work nicely and not break
> other parts of the core, regulator_count is defined as "int" now instead
> of "unsigned int" and it can have different special values now. It is
> set to -1 initially to mark it "uninitialized" and later only we set it
> to 0 or positive values after checking how many supplies are there.
> This also helps in finding the bugs where only few of the OPPs have the
> "opp-microvolt" property set and not all.

Tested on Juno r0 and Hikey960 successfully. The 'supply' directory is
now correctly exposed.

Feel free to add Tested-by: Quentin Perret <quentin.perret@xxxxxxx>