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Message-ID: <20220712011948.GA210054@nchen-desktop>
Date: Tue, 12 Jul 2022 09:19:48 +0800
From: Peter Chen <peter.chen@...nel.org>
To: "Mehta, Piyush" <piyush.mehta@....com>
Cc: Piyush Mehta <piyush.mehta@...inx.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"michal.simek@...inx.com" <michal.simek@...inx.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"git@...inx.com" <git@...inx.com>,
"sivadur@...inx.com" <sivadur@...inx.com>,
"radheys@...inx.com" <radheys@...inx.com>
Subject: Re: [RFC PATCH] usb: chipidea: Add support for VBUS control with PHY
On 22-07-11 16:45:20, Mehta, Piyush wrote:
> Hello Peter,
>
> Thanks for the review.
> Yes, we are supporting OTG feature and have used OTG FSM platform.
Please generate the formal patch with my ack, thanks.
Acked-by: Peter Chen <peter.chen@...nel.org>
>
> Regards,
> Piyush Mehta
>
> > -----Original Message-----
> > From: Peter Chen <peter.chen@...nel.org>
> > Sent: Sunday, July 3, 2022 6:05 AM
> > To: Piyush Mehta <piyush.mehta@...inx.com>
> > Cc: gregkh@...uxfoundation.org; michal.simek@...inx.com; linux-
> > usb@...r.kernel.org; linux-kernel@...r.kernel.org; git@...inx.com;
> > sivadur@...inx.com; radheys@...inx.com
> > Subject: Re: [RFC PATCH] usb: chipidea: Add support for VBUS control with
> > PHY
> >
> > CAUTION: This message has originated from an External Source. Please use
> > proper judgment and caution when opening attachments, clicking links, or
> > responding to this email.
> >
> >
> > On 22-05-24 17:38:02, Piyush Mehta wrote:
> > > 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@...inx.com>
> > > ---
> > > 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);
> > > +
> >
> > Have your platform used OTG FSM? If not used, do not need to change it.
> > Otherwise, it is okay for me.
> >
> > Peter
> >
> > > 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
> > >
> >
> > --
> >
> > Thanks,
> > Peter Chen
>
--
Thanks,
Peter Chen
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