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Message-ID: <76c0b6bc5b7f477998462d8b48d96272@BN1PR0301MB0772.namprd03.prod.outlook.com>
Date: Fri, 25 Jul 2014 00:34:39 +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
> > >
> > > - 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.
> >
> > >
> > > - if (IS_ERR(ci->usb_phy)) {
> > > - ret = PTR_ERR(ci->usb_phy);
> > > + if (IS_ERR(ci->phy)) {
> > > /*
> > > * if -ENXIO is returned, it means PHY layer wasn't
> > > * enabled, so it makes no sense to return -EPROBE_DEFER
> > > * in that case, since no PHY driver will ever probe.
> > > */
> > > - if (ret == -ENXIO)
> > > - return ret;
> > > + if (PTR_ERR(ci->phy) == -ENXIO)
> > > + return -ENXIO;
> > >
> > > - dev_err(dev, "no usb2 phy configured\n");
> > > - return -EPROBE_DEFER;
> > > + ci->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> > > + if (IS_ERR(ci->usb_phy)) {
> > > + dev_err(dev, "no usb2 phy configured\n");
> > > + return -EPROBE_DEFER;
> > > + }
> > > }
>
> [snip]
>
> > > diff --git a/drivers/usb/chipidea/debug.c
> > > b/drivers/usb/chipidea/debug.c index d47cddd38e4a..77881a5ce48f
> > > 100644
> > > --- a/drivers/usb/chipidea/debug.c
> > > +++ b/drivers/usb/chipidea/debug.c
> > > @@ -219,7 +219,9 @@ int ci_otg_show(struct seq_file *s, void *unused)
> > > fsm = &ci->fsm;
> > >
> > > /* ------ State ----- */
> > > - usb_otg_state_string(ci->usb_phy->otg.state));
> > > + if (ci->usb_phy)
> > > + seq_printf(s, "OTG state: %s\n\n",
> > > + usb_otg_state_string(ci->usb_phy->otg->state));
> >
> > You may change wrongly here.
>
> I thought a pointer to the OTG info wasn't available from there. I just
> checked, and it seems we can retrieve if from the otg_fsm structure here.
> I'll test and update.
>
> > > @@ -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;
Peter
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