linux-kernel - Re: [PATCH 3/3] phy: amlogic: meson8b-usb2: fix shared reset control use

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Message-ID: <CAFBinCA6_Cei5QdiVRTX14S5QFoyDgAOhFUXtnx5uiAxuTRs9A@mail.gmail.com>
Date:   Sat, 14 Nov 2020 20:11:59 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Amjad Ouled-Ameur <aouledameur@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-amlogic@...ts.infradead.org,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH 3/3] phy: amlogic: meson8b-usb2: fix shared reset control use

Hi Amjad,

On Fri, Nov 13, 2020 at 1:07 AM Amjad Ouled-Ameur
<aouledameur@...libre.com> wrote:
[...]
>         ret = clk_prepare_enable(priv->clk_usb);
>         if (ret) {
>                 dev_err(&phy->dev, "Failed to enable USB DDR clock\n");
> +               reset_control_rearm(priv->reset);
this should come after reset_control_rearm so we're cleaning up in
reverse order of initializing things
(in this case it probably makes no difference since
reset_control_rearm is not touching any registers, but I'd still have
it in the correct order to not confuse future developers)

>                 clk_disable_unprepare(priv->clk_usb_general);
>                 return ret;
>         }
> @@ -197,6 +199,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy)
>                         regmap_read(priv->regmap, REG_ADP_BC, &reg);
>                         if (reg & REG_ADP_BC_ACA_PIN_FLOAT) {
>                                 dev_warn(&phy->dev, "USB ID detect failed!\n");
> +                               reset_control_rearm(priv->reset);
same here, reset_control_rearm should be after clk_disable_unprepare

>                                 clk_disable_unprepare(priv->clk_usb);
>                                 clk_disable_unprepare(priv->clk_usb_general);
>                                 return -EINVAL;
> @@ -216,6 +219,7 @@ static int phy_meson8b_usb2_power_off(struct phy *phy)
>                                    REG_DBG_UART_SET_IDDQ,
>                                    REG_DBG_UART_SET_IDDQ);
>
> +       reset_control_rearm(priv->reset);
same here, reset_control_rearm should be after clk_disable_unprepare

>         clk_disable_unprepare(priv->clk_usb);
>         clk_disable_unprepare(priv->clk_usb_general);


Best regards,
Martin