linux-kernel - Re: [PATCH v4 04/16] phy: qcom-qusb2: Power-on PHY before initialization

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Date:   Fri, 12 Jan 2018 13:59:07 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Manu Gautam <mgautam@...eaurora.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Felipe Balbi <balbi@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "open list:GENERIC PHY FRAMEWORK" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 04/16] phy: qcom-qusb2: Power-on PHY before initialization

On Wed, Jan 3, 2018 at 4:58 PM, Manu Gautam <mgautam@...eaurora.org> wrote:
> PHY must be powered on before turning ON clocks and
> attempting to initialize it. Driver is exposing
> separate init and power_on routines for this.
> Apparently USB dwc3 core driver performs power-on
> after init. Also, poweron and init for QUSB2 PHY
> need to be executed together always, hence remove
> poweron callback from phy_ops and explicitly perform
> this from init, similar changes needed for poweroff.
>
> Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
> ---

Looks good.

Reviewed-by: Vivek Gautam <vivek.gautam@...eaurora.org>

Thanks
Vivek

>  drivers/phy/qualcomm/phy-qcom-qusb2.c | 47 +++++++++++------------------------
>  1 file changed, 15 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qusb2.c b/drivers/phy/qualcomm/phy-qcom-qusb2.c
> index 6c57524..4a5b2a1 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qusb2.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qusb2.c
> @@ -195,54 +195,31 @@ static void qusb2_phy_set_tune2_param(struct qusb2_phy *qphy)
>         qusb2_setbits(qphy->base, QUSB2PHY_PORT_TUNE2, val[0] << 0x4);
>  }
>
> -static int qusb2_phy_poweron(struct phy *phy)
> +static int qusb2_phy_init(struct phy *phy)
>  {
>         struct qusb2_phy *qphy = phy_get_drvdata(phy);
> -       int num = ARRAY_SIZE(qphy->vregs);
> +       unsigned int val;
> +       unsigned int clk_scheme;
>         int ret;
>
> -       dev_vdbg(&phy->dev, "%s(): Powering-on QUSB2 phy\n", __func__);
> +       dev_vdbg(&phy->dev, "%s(): Initializing QUSB2 phy\n", __func__);
>
>         /* turn on regulator supplies */
> -       ret = regulator_bulk_enable(num, qphy->vregs);
> +       ret = regulator_bulk_enable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
>         if (ret)
>                 return ret;
>
>         ret = clk_prepare_enable(qphy->iface_clk);
>         if (ret) {
>                 dev_err(&phy->dev, "failed to enable iface_clk, %d\n", ret);
> -               regulator_bulk_disable(num, qphy->vregs);
> -               return ret;
> +               goto poweroff_phy;
>         }
>
> -       return 0;
> -}
> -
> -static int qusb2_phy_poweroff(struct phy *phy)
> -{
> -       struct qusb2_phy *qphy = phy_get_drvdata(phy);
> -
> -       clk_disable_unprepare(qphy->iface_clk);
> -
> -       regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
> -
> -       return 0;
> -}
> -
> -static int qusb2_phy_init(struct phy *phy)
> -{
> -       struct qusb2_phy *qphy = phy_get_drvdata(phy);
> -       unsigned int val;
> -       unsigned int clk_scheme;
> -       int ret;
> -
> -       dev_vdbg(&phy->dev, "%s(): Initializing QUSB2 phy\n", __func__);
> -
>         /* enable ahb interface clock to program phy */
>         ret = clk_prepare_enable(qphy->cfg_ahb_clk);
>         if (ret) {
>                 dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
> -               return ret;
> +               goto disable_iface_clk;
>         }
>
>         /* Perform phy reset */
> @@ -344,6 +321,11 @@ static int qusb2_phy_init(struct phy *phy)
>         reset_control_assert(qphy->phy_reset);
>  disable_ahb_clk:
>         clk_disable_unprepare(qphy->cfg_ahb_clk);
> +disable_iface_clk:
> +       clk_disable_unprepare(qphy->iface_clk);
> +poweroff_phy:
> +       regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
> +
>         return ret;
>  }
>
> @@ -361,6 +343,9 @@ static int qusb2_phy_exit(struct phy *phy)
>         reset_control_assert(qphy->phy_reset);
>
>         clk_disable_unprepare(qphy->cfg_ahb_clk);
> +       clk_disable_unprepare(qphy->iface_clk);
> +
> +       regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
>
>         return 0;
>  }
> @@ -368,8 +353,6 @@ static int qusb2_phy_exit(struct phy *phy)
>  static const struct phy_ops qusb2_phy_gen_ops = {
>         .init           = qusb2_phy_init,
>         .exit           = qusb2_phy_exit,
> -       .power_on       = qusb2_phy_poweron,
> -       .power_off      = qusb2_phy_poweroff,
>         .owner          = THIS_MODULE,
>  };
>
> --
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