linux-kernel - Re: [PATCH] opp: core: Revert "add regulators enable and disable"

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Date:   Fri, 18 Oct 2019 12:42:11 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Viresh Kumar <vireshk@...nel.org>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Kamil Konieczny <k.konieczny@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH] opp: core: Revert "add regulators enable and disable"

On Thu, Oct 17, 2019 at 12:27:58PM +0200, Marek Szyprowski wrote:
> All the drivers, which use the OPP framework control regulators, which
> are already enabled. Typically those regulators are also system critical,
> due to providing power to CPU core or system buses. It turned out that
> there are cases, where calling regulator_enable() on such boot-enabled
> regulator has side-effects and might change its initial voltage due to
> performing initial voltage balancing without all restrictions from the
> consumers. Until this issue becomes finally solved in regulator core,
> avoid calling regulator_enable()/disable() from the OPP framework.

Reviewed-by: Mark Brown <broonie@...nel.org>

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