Ping
Regards,
Piyush Mehta
> -----Original Message-----
> From: Piyush Mehta <piyush.mehta@xxxxxxxxxx>
> Sent: Tuesday, May 24, 2022 5:38 PM
> To: peter.chen@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; Michal Simek
> <michals@xxxxxxxxxx>
> Cc: linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; git
> <git@xxxxxxxxxx>; Siva Durga Prasad Paladugu <sivadur@xxxxxxxxxx>; Radhey
> Shyam Pandey <radheys@xxxxxxxxxx>; Piyush Mehta <piyushm@xxxxxxxxxx>
> Subject: [RFC PATCH] usb: chipidea: Add support for VBUS control with PHY
>
> 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.
>
> Flag 'CI_HDRC_PHY_VBUS_CONTROL' added to support VBus control feature.
>
> Signed-off-by: Piyush Mehta <piyush.mehta@xxxxxxxxxx>
> ---
> We have created this patch as RFC, as I introduced a new flag
> (CI_HDRC_PHY_VBUS_CONTROL) and would like to get comment if it's the
> proper way to check for VBus support for zynq.
> ---
> drivers/usb/chipidea/ci_hdrc_usb2.c | 1 +
> drivers/usb/chipidea/host.c | 7 +++++++
> drivers/usb/chipidea/otg_fsm.c | 7 +++++++
> include/linux/usb/chipidea.h | 1 +
> 4 files changed, 16 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
> bdc3885..bc3634a 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -63,6 +63,13 @@ 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) {
> + if (enable)
> + usb_phy_vbus_on(ci->usb_phy);
> + else
> + usb_phy_vbus_off(ci->usb_phy);
> + }
> +
> if (enable && (ci->platdata->phy_mode ==
> USBPHY_INTERFACE_MODE_HSIC)) {
> /*
> * Marvell 28nm HSIC PHY requires forcing the port to HS
> mode.
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index 6ed4b00..5ed9164 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)
> + usb_phy_vbus_on(ci->usb_phy);
> +
> /* 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)
> + usb_phy_vbus_off(ci->usb_phy);
> +
> 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
> --
> 2.7.4
