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Date:	Fri, 25 Jul 2014 10:13:49 +0200
From:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
To:	Peter Chen <Peter.Chen@...escale.com>
Cc:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>, "balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"kishon@...com" <kishon@...com>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"sergei.shtylyov@...entembedded.com" 
	<sergei.shtylyov@...entembedded.com>,
	"yoshihiro.shimoda.uh@...esas.com" <yoshihiro.shimoda.uh@...esas.com>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"thomas.petazzoni@...e-electrons.com" 
	<thomas.petazzoni@...e-electrons.com>,
	"zmxu@...vell.com" <zmxu@...vell.com>,
	"jszhang@...vell.com" <jszhang@...vell.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 8/8] usb: chipidea: add support to the generic PHY
 framework in ChipIdea

Hi Peter,

On Fri, Jul 25, 2014 at 12:34:39AM +0000, Peter Chen wrote:
>  
> > > >
> > > > -	if (ci->platdata->usb_phy)
> > > > +	if (ci->platdata->phy)
> > > > +		ci->phy = ci->platdata->phy;
> > > > +	else if (ci->platdata->usb_phy)
> > > >  		ci->usb_phy = ci->platdata->usb_phy;
> > > >  	else
> > > > -		ci->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> > > > +		ci->phy = of_phy_get(dev->of_node, 0);
> > >
> > > Here, we may need to consider both usb_phy and generic_phy, and the
> > > core device is not populated from device tree.
> > >
> > > You can use devm_usb_get_phy and devm_phy_get for global phy case.
> > 
> > This is the case. If no PHY is found by of_phy_get() we try to get an USB
> > PHY by calling devm_usb_get_phy().
> > 
> 
> Like I said above, the core device is not populated from DT, so the DT version
> phy API may not be needed. 

I see, I'll switch to devm_usb_get_phy() and devm_phy_get().

> > 
> > > > @@ -85,13 +88,16 @@ static int host_start(struct ci_hdrc *ci)
> > > >  	if (ret) {
> > > >  		goto disable_reg;
> > > >  	} else {
> > > > -		struct usb_otg *otg = ci->usb_phy->otg;
> > > > +		if (ci->usb_phy) {
> > > > +			struct usb_otg *otg = ci->usb_phy->otg;
> > > >
> > > > -		ci->hcd = hcd;
> > > > -		if (otg) {
> > > > -			otg->host = &hcd->self;
> > > > -			hcd->self.otg_port = 1;
> > > > +			if (otg) {
> > > > +				otg->host = &hcd->self;
> > > > +				hcd->self.otg_port = 1;
> > > > +			}
> > > >  		}
> > >
> > > The otg port is still existed even use generic phy.
> > 
> > Yes. I don't know how to retrieve the OTG pointer when we do not use an
> > USB PHY. We may have to add an OTG member into the ci_hdrc structure, but
> > I didn't understand well where does occur this OTG setup.
> > 
> > I may have missed something. Do you know if CI OTG always is in FSM mode?
> > If so we could access the OTG pointer through ci_hdrc->fsm.
> > 
> 
> Just add OTG member into ci_hdrc structure, see below patch
> 
> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
> index 9563cb5..186fb3f 100644
> --- a/drivers/usb/chipidea/ci.h
> +++ b/drivers/usb/chipidea/ci.h
> @@ -207,6 +207,7 @@ struct ci_hdrc {
>         bool                            id_event;
>         bool                            b_sess_valid_event;
>         bool                            imx28_write_fix;
> +       struct usb_otg                  otg;
>  };
>  
>  static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index a93d950..70d7fe2 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -85,7 +85,7 @@ static int host_start(struct ci_hdrc *ci)
>         if (ret) {
>                 goto disable_reg;
>         } else {
> -               struct usb_otg *otg = ci->transceiver->otg;
> +               struct usb_otg *otg = &ci->otg;
>  
>                 ci->hcd = hcd;
>                 if (otg) {
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index 8cb2508..fc8847e 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -778,20 +778,8 @@ void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
>  int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
>  {
>         int retval = 0;
> -       struct usb_otg *otg;
>  
> -       otg = devm_kzalloc(ci->dev,
> -                       sizeof(struct usb_otg), GFP_KERNEL);
> -       if (!otg) {
> -               dev_err(ci->dev,
> -               "Failed to allocate usb_otg structure for ci hdrc otg!\n");
> -               return -ENOMEM;
> -       }
> -
> -       otg->phy = ci->transceiver;
> -       otg->gadget = &ci->gadget;
> -       ci->fsm.otg = otg;
> -       ci->transceiver->otg = ci->fsm.otg;
> +       ci->fsm.otg = &ci->otg;
>         ci->fsm.power_up = 1;
>         ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
>         ci->fsm.otg->state = OTG_STATE_UNDEFINED;
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index 33d3480..b2f7587 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -14,7 +14,6 @@
>  struct usb_otg {
>         u8                      default_a;
>  
> -       struct usb_phy          *phy;
>         struct usb_bus          *host;
>         struct usb_gadget       *gadget;
>  
> diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> index ac7d791..b732541 100644
> --- a/include/linux/usb/phy.h
> +++ b/include/linux/usb/phy.h
> @@ -79,8 +79,6 @@ struct usb_phy {
>         enum usb_phy_type       type;
>         enum usb_phy_events     last_event;
>  
> -       struct usb_otg          *otg;
> -
>         struct device           *io_dev;
>         struct usb_phy_io_ops   *io_ops;
>         void __iomem            *io_priv;
> b29397@...inux1:~/work/projects/upstream/usb/usb$ git diff > a.diff
> b29397@...inux1:~/work/projects/upstream/usb/usb$ cat a.diff
> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
> index 9563cb5..186fb3f 100644
> --- a/drivers/usb/chipidea/ci.h
> +++ b/drivers/usb/chipidea/ci.h
> @@ -207,6 +207,7 @@ struct ci_hdrc {
>  	bool				id_event;
>  	bool				b_sess_valid_event;
>  	bool				imx28_write_fix;
> +	struct usb_otg			otg;
>  };
>  
>  static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index a93d950..70d7fe2 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -85,7 +85,7 @@ static int host_start(struct ci_hdrc *ci)
>  	if (ret) {
>  		goto disable_reg;
>  	} else {
> -		struct usb_otg *otg = ci->transceiver->otg;
> +		struct usb_otg *otg = &ci->otg;
>  
>  		ci->hcd = hcd;
>  		if (otg) {
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index 8cb2508..fc8847e 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -778,20 +778,8 @@ void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
>  int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
>  {
>  	int retval = 0;
> -	struct usb_otg *otg;
>  
> -	otg = devm_kzalloc(ci->dev,
> -			sizeof(struct usb_otg), GFP_KERNEL);
> -	if (!otg) {
> -		dev_err(ci->dev,
> -		"Failed to allocate usb_otg structure for ci hdrc otg!\n");
> -		return -ENOMEM;
> -	}
> -
> -	otg->phy = ci->transceiver;
> -	otg->gadget = &ci->gadget;
> -	ci->fsm.otg = otg;
> -	ci->transceiver->otg = ci->fsm.otg;
> +	ci->fsm.otg = &ci->otg;
>  	ci->fsm.power_up = 1;
>  	ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
>  	ci->fsm.otg->state = OTG_STATE_UNDEFINED;
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index 33d3480..b2f7587 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -14,7 +14,6 @@
>  struct usb_otg {
>  	u8			default_a;
>  
> -	struct usb_phy		*phy;
>  	struct usb_bus		*host;
>  	struct usb_gadget	*gadget;
>  
> diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> index ac7d791..b732541 100644
> --- a/include/linux/usb/phy.h
> +++ b/include/linux/usb/phy.h
> @@ -79,8 +79,6 @@ struct usb_phy {
>  	enum usb_phy_type	type;
>  	enum usb_phy_events	last_event;
>  
> -	struct usb_otg		*otg;
> -
>  	struct device		*io_dev;
>  	struct usb_phy_io_ops	*io_ops;
>  	void __iomem		*io_priv;

Where does the ci->otg setup occurs? It seems to me it's never filled.

Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
--
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