linux-kernel - Re: [RESEND PATCH v2 1/2] soc: amlogic: add Meson GX VPU Domains driver

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Message-ID: <CAPDyKFpCf50XRowGe3X5KpmhKrb99NTxOUQtz4RN4aemAVAJCA@mail.gmail.com>
Date:   Mon, 30 Oct 2017 16:40:07 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        linux-pm@...ts.linux-foundation.org,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v2 1/2] soc: amlogic: add Meson GX VPU Domains driver

Hi Neil,

[...]

> +
> +       pm_genpd_init(&vpu_hdmi_pd.genpd, &simple_qos_governor,
> +                     meson_gx_pwrc_vpu_get_power(&vpu_hdmi_pd));
> +

This means that you may initialize the genpd in powered on state.

For that scenario, I think you will hit a clock unprepare/disable
in-balance issue when genpd calls your ->power_off() callback, simply
because you didn't call clk_prepare_enable() for the clocks first.

[...]

Kind regards
Uffe