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Date: Fri, 25 Jul 2014 08:33:28 +0000
From: Peter Chen <Peter.Chen@...escale.com>
To: Antoine Ténart
<antoine.tenart@...e-electrons.com>
CC: "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
> > >
> >
> > 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.
>
Currently, only two fields at struct usb_otg are needed for chipidea, they are:
struct usb_bus *host;
enum usb_otg_state state;
They are initialized at:
ci_hdrc_otg_fsm_init and host_start.
Peter
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