linux-kernel - Re: [PATCH v7 1/4] phy: Update PHY power control sequence

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Date:   Mon, 2 Jul 2018 22:30:19 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Can Guo <cang@...eaurora.org>
Cc:     Subhash Jadavani <subhashj@...eaurora.org>,
        asutoshd@...eaurora.org, Manu Gautam <mgautam@...eaurora.org>,
        kishon <kishon@...com>, "robh+dt" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v7 1/4] phy: Update PHY power control sequence

On Tue, Jun 19, 2018 at 2:06 PM, Can Guo <cang@...eaurora.org> wrote:
> All PHYs should be powered on before register configuration starts. And
> only PCIe PHYs need an extra power control before deasserts reset state.
>
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 97ef942..ccb8578 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -935,10 +935,12 @@ static void qcom_qmp_phy_configure(void __iomem *base,
>         }
>  }
>
> -static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
> +static int qcom_qmp_phy_com_init(struct qmp_phy *qphy)
>  {
> +       struct qcom_qmp *qmp = qphy->qmp;
>         const struct qmp_phy_cfg *cfg = qmp->cfg;
>         void __iomem *serdes = qmp->serdes;
> +       void __iomem *pcs = qphy->pcs;
>         void __iomem *dp_com = qmp->dp_com;
>         int ret, i;
>
> @@ -979,10 +981,6 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
>                 goto err_rst;
>         }
>
> -       if (cfg->has_phy_com_ctrl)
> -               qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
> -                            SW_PWRDN);
> -
>         if (cfg->has_phy_dp_com_ctrl) {
>                 qphy_setbits(dp_com, QPHY_V3_DP_COM_POWER_DOWN_CTRL,
>                              SW_PWRDN);
> @@ -1000,6 +998,12 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
>                              SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
>         }
>
> +       if (cfg->has_phy_com_ctrl)
> +               qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
> +                            SW_PWRDN);
> +       else
> +               qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
> +
>         /* Serdes configuration */
>         qcom_qmp_phy_configure(serdes, cfg->regs, cfg->serdes_tbl,
>                                cfg->serdes_tbl_num);
> @@ -1090,7 +1094,7 @@ static int qcom_qmp_phy_init(struct phy *phy)
>
>         dev_vdbg(qmp->dev, "Initializing QMP phy\n");
>
> -       ret = qcom_qmp_phy_com_init(qmp);
> +       ret = qcom_qmp_phy_com_init(qphy);
>         if (ret)
>                 return ret;
>
> @@ -1127,7 +1131,8 @@ static int qcom_qmp_phy_init(struct phy *phy)
>          * Pull out PHY from POWER DOWN state.
>          * This is active low enable signal to power-down PHY.
>          */
> -       qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
> +       if(cfg->type == PHY_TYPE_PCIE)
> +               qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
>
>         if (cfg->has_pwrdn_delay)
>                 usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>

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

Best regards
Vivek
-- 
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