linux-kernel - Re: [PATCH] usb: phy: mxs: Disable external charger detect in mxs_phy_hw

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Message-ID: <CAL411-qcHLFL6ATCqHw_jCZDiHvsF32WZM5dJGCC4C0vyiGvwQ@mail.gmail.com>
Date:   Wed, 29 May 2019 16:01:51 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-usb@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: phy: mxs: Disable external charger detect in mxs_phy_hw_init()

On Wed, May 29, 2019 at 3:01 PM Andrey Smirnov <andrew.smirnov@...il.com> wrote:
>
> Since this driver already handles changer detction state, copy the
> workaround code currently residing in arch/arm/mach-imx/anatop.c into
> this drier to consolidate the places modifying it.
>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: NXP Linux Team <linux-imx@....com>
> Cc: linux-usb@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>
> The intent of this patch is to consolidate all of the code maipulating
> charge detection state to a signle place and if this patch is agreed
> upon I plan to follow it up with this change:
>
> https://github.com/ndreys/linux/commit/7248f2b85b4706760fd33d2ff970e2ea12d3bea7
>
> Thanks,
> Andrey Smirnov
>
>  drivers/usb/phy/phy-mxs-usb.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
> index 1b1bb0ad40c3..6fa16ab31e2e 100644
> --- a/drivers/usb/phy/phy-mxs-usb.c
> +++ b/drivers/usb/phy/phy-mxs-usb.c
> @@ -63,6 +63,7 @@
>
>  #define ANADIG_USB1_CHRG_DETECT_SET            0x1b4
>  #define ANADIG_USB1_CHRG_DETECT_CLR            0x1b8
> +#define ANADIG_USB2_CHRG_DETECT_SET            0x214
>  #define ANADIG_USB1_CHRG_DETECT_EN_B           BIT(20)
>  #define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B     BIT(19)
>  #define ANADIG_USB1_CHRG_DETECT_CHK_CONTACT    BIT(18)
> @@ -250,6 +251,19 @@ static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
>         if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX)
>                 writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET);
>
> +       if (mxs_phy->regmap_anatop) {
> +               unsigned int reg = mxs_phy->port_id ?
> +                       ANADIG_USB1_CHRG_DETECT_SET :
> +                       ANADIG_USB2_CHRG_DETECT_SET;
> +               /*
> +                * The external charger detector needs to be disabled,
> +                * or the signal at DP will be poor
> +                */
> +               regmap_write(mxs_phy->regmap_anatop, reg,
> +                            ANADIG_USB1_CHRG_DETECT_EN_B |
> +                            ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
> +       }
> +
>         mxs_phy_tx_init(mxs_phy);
>
>         return 0;
> --
> 2.21.0
>

Reviewed-by: Peter Chen <peter.chen@....com>