linux-kernel - Re: [PATCH 1/6] usb: chipidea: Add support for VBUS control with PHY

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Date:   Fri, 8 Oct 2021 12:59:51 +0800
From:   Jun Li <lijun.kernel@...il.com>
To:     Manish Narani <manish.narani@...inx.com>, Li Jun <jun.li@....com>
Cc:     peter.chen@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        michal.simek@...inx.com,
        Linux USB List <linux-usb@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, git@...inx.com,
        Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
Subject: Re: [PATCH 1/6] usb: chipidea: Add support for VBUS control with PHY

Manish Narani <manish.narani@...inx.com> 于2021年8月25日周三 上午1:23写道：
>
> Some platforms make use of VBUS control over PHY which
> means controller driver has to access PHY registers to
> turn on/off VBUS line.This patch adds support for
> such platforms in chipidea.
>
> Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  drivers/usb/chipidea/ci_hdrc_usb2.c | 1 +
>  drivers/usb/chipidea/host.c         | 9 +++++++++
>  drivers/usb/chipidea/otg_fsm.c      | 7 +++++++
>  include/linux/usb/chipidea.h        | 1 +
>  4 files changed, 18 insertions(+)
>
> diff --git a/drivers/usb/chipidea/ci_hdrc_usb2.c b/drivers/usb/chipidea/ci_hdrc_usb2.c
> index 89e1d82..dc86b12 100644
> --- a/drivers/usb/chipidea/ci_hdrc_usb2.c
> +++ b/drivers/usb/chipidea/ci_hdrc_usb2.c
> @@ -30,6 +30,7 @@ static const struct ci_hdrc_platform_data ci_default_pdata = {
>
>  static const struct ci_hdrc_platform_data ci_zynq_pdata = {
>         .capoffset      = DEF_CAPOFFSET,
> +       .flags          = CI_HDRC_PHY_VBUS_CONTROL,
>  };
>
>  static const struct ci_hdrc_platform_data ci_zevio_pdata = {
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index e86d13c..578968d 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -63,6 +63,14 @@ static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
>                 priv->enabled = enable;
>         }
>
> +       if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL &&
> +           ci->usb_phy && ci->usb_phy->set_vbus) {
> +               if (enable)
> +                       ci->usb_phy->set_vbus(ci->usb_phy, 1);
> +               else
> +                       ci->usb_phy->set_vbus(ci->usb_phy, 0);
> +       }
> +

Can existing API usb_phy_vbus_on/off() work for you? I think that
helper will make it simple so you don't need a new flag and those
checks.

Li Jun
>         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
>                 /*
>                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
> @@ -71,6 +79,7 @@ static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
>                 hw_port_test_set(ci, 5);
>                 hw_port_test_set(ci, 0);
>         }
> +
>         return 0;
>  };
>
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index 6ed4b00..2f7f94d 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -471,6 +471,10 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
>                                 return;
>                         }
>                 }
> +
> +               if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL)
> +                       ci->usb_phy->set_vbus(ci->usb_phy, 1);
> +
>                 /* Disable data pulse irq */
>                 hw_write_otgsc(ci, OTGSC_DPIE, 0);
>
> @@ -480,6 +484,9 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
>                 if (ci->platdata->reg_vbus)
>                         regulator_disable(ci->platdata->reg_vbus);
>
> +               if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL)
> +                       ci->usb_phy->set_vbus(ci->usb_phy, 0);
> +
>                 fsm->a_bus_drop = 1;
>                 fsm->a_bus_req = 0;
>         }
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index edf3342..ee38835 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -62,6 +62,7 @@ struct ci_hdrc_platform_data {
>  #define CI_HDRC_REQUIRES_ALIGNED_DMA   BIT(13)
>  #define CI_HDRC_IMX_IS_HSIC            BIT(14)
>  #define CI_HDRC_PMQOS                  BIT(15)
> +#define CI_HDRC_PHY_VBUS_CONTROL       BIT(16)
>         enum usb_dr_mode        dr_mode;
>  #define CI_HDRC_CONTROLLER_RESET_EVENT         0
>  #define CI_HDRC_CONTROLLER_STOPPED_EVENT       1
> --
> 2.1.1
>