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Message-ID: <20140724122557.GB21062@kwain>
Date: Thu, 24 Jul 2014 14:25:57 +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,
gregkh@...uxfoundation.org, kishon@...com,
stern@...land.harvard.edu, sergei.shtylyov@...entembedded.com,
yoshihiro.shimoda.uh@...esas.com,
alexandre.belloni@...e-electrons.com,
thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
jszhang@...vell.com, linux-usb@...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 Thu, Jul 24, 2014 at 07:39:42PM +0800, Peter Chen wrote:
> On Tue, Jul 15, 2014 at 04:39:16PM +0200, Antoine Ténart wrote:
> >
> > /**
> > + * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
> > + * interfaces
> > + * @ci: the controller
> > + *
> > + * This function returns an error code if the phy failed to init
> > + */
> > +static int _ci_usb_phy_init(struct ci_hdrc *ci)
> > +{
> > + int ret;
> > +
> > + if (ci->phy) {
> > + ret = phy_init(ci->phy);
> > + if (ret) {
> > + phy_exit(ci->phy);
>
> If phy_init fails, we still need to call phy_exit?
>
> > + return ret;
> > + }
> > + ret = phy_power_on(ci->phy);
>
> If phy_power_on fails, we may need to call phy_exit
Sure, phy_exit() should be moved under the calling to phy_power_on().
> >
> > - 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().
>
> >
> > - 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.
> >
> > if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
> > diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> > index 8a64ce87364e..2c11f260633c 100644
> > --- a/drivers/usb/chipidea/otg_fsm.c
> > +++ b/drivers/usb/chipidea/otg_fsm.c
> > @@ -788,10 +788,12 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
> > return -ENOMEM;
> > }
> >
> > - otg->usb_phy = ci->usb_phy;
> > + if (ci->phy)
> > + otg->phy = ci->phy;
> > + else
> > + otg->usb_phy = ci->usb_phy;
> > otg->gadget = &ci->gadget;
> > ci->fsm.otg = otg;
> > - ci->usb_phy->otg = ci->fsm.otg;
>
> Why you remove above line?
It shouldn't be removed as it is, because we still use it in CI. As far
as I know, this is not used in the common OTG code. If we manage to put
the OTG information into the ci_hdrc structure, we could safely remove
this line.
I guess the answer to the previous comment will also fix this :)
Thanks!
Antoine
--
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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