linux-kernel - Re: [PATCH 1/4] usb: musb: Call atomic_notifier_call

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Message-Id: <201309171805.15460@pali>
Date:	Tue, 17 Sep 2013 18:05:15 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	balbi@...com
Cc:	Tony Lindgren <tony@...mide.com>,
	Anton Vorontsov <anton@...msg.org>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	freemangordon@....bg, aaro.koskinen@....fi, pavel@....cz
Subject: Re: [PATCH 1/4] usb: musb: Call atomic_notifier_call_chain when status is changed

On Tuesday 17 September 2013 17:48:59 you wrote:
> On Sun, Sep 08, 2013 at 10:50:36AM +0200, Pali Rohár wrote:
> > More power supply drivers depends on vbus events and without
> > it they not working. Power supply drivers using
> > usb_register_notifier, so to deliver events it is needed to
> > call atomic_notifier_call_chain.
> > 
> > So without atomic notifier power supply driver isp1704 not
> > retrieving vbus status and reporting bogus values to
> > userspace and also to board platform data functions.
> > Without proper data charger drivers trying to charge
> > battery also when charger is disconnected or do not start
> > charging when wallcharger connects.
> > 
> > Atomic notifier in musb driver was used before v3.5 and was
> > replaced with omap mailbox. This patch adding
> > atomic_notifier_call_chain call from function
> > omap_musb_set_mailbox.
> > 
> > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > ---
> > 
> >  drivers/usb/musb/omap2430.c       |    3 +++
> >  drivers/usb/phy/phy-twl4030-usb.c |    2 ++
> >  2 files changed, 5 insertions(+)
> > 
> > diff --git a/drivers/usb/musb/omap2430.c
> > b/drivers/usb/musb/omap2430.c index f44e8b5..5c40252 100644
> > --- a/drivers/usb/musb/omap2430.c
> > +++ b/drivers/usb/musb/omap2430.c
> > @@ -305,6 +305,9 @@ static void omap_musb_set_mailbox(struct
> > omap2430_glue *glue)
> > 
> >  	default:
> >  		dev_dbg(dev, "ID float\n");
> >  	
> >  	}
> > 
> > +
> > +	atomic_notifier_call_chain(&musb->xceiv->notifier,
> > +			musb->xceiv->last_event, NULL);
> 
> let's add a wrapper for this:
> 
> static inline int usb_phy_notify(struct usb phy *x, unsigned
> val, void *v) {
> 	return atomic_notifier_call_chain(&x->notifier, val, v);
> }

Where to add this wrapper? To omap2430.c? or some include file?

On Tuesday 17 September 2013 17:49:17 Felipe Balbi wrote:
> On Sun, Sep 08, 2013 at 10:50:36AM +0200, Pali Rohár wrote:
> > diff --git a/drivers/usb/phy/phy-twl4030-usb.c
> > b/drivers/usb/phy/phy-twl4030-usb.c index 8f78d2d..efe6155
> > 100644
> > --- a/drivers/usb/phy/phy-twl4030-usb.c
> > +++ b/drivers/usb/phy/phy-twl4030-usb.c
> > @@ -705,6 +705,8 @@ static int twl4030_usb_probe(struct
> > platform_device *pdev)
> > 
> >  	if (device_create_file(&pdev->dev, &dev_attr_vbus))
> >  	
> >  		dev_warn(&pdev->dev, "could not create sysfs file\n");
> > 
> > +	ATOMIC_INIT_NOTIFIER_HEAD(&twl->phy.notifier);
> 
> BTW, this is a bugfix, send separately.

What to send separately?

This full patch 1/4 is bugfix. And I did not understand what you 
want. Maybe it could be easier for you to apply this small 3+2 
lines patch how you need.

-- 
Pali Rohár
pali.rohar@...il.com

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