linux-kernel - Re: [PATCH v4 4/5] usb: host: add some to xhci overrides for xhci-exynos

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Date:   Wed, 27 Apr 2022 18:19:01 +0900
From:   Jung Daehwan <dh10.jung@...sung.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Howard Yen <howardyen@...gle.com>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>, sc.suh@...sung.com,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH v4 4/5] usb: host: add some to xhci overrides for
 xhci-exynos

On Tue, Apr 26, 2022 at 12:23:30PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Apr 26, 2022 at 06:18:47PM +0900, Daehwan Jung wrote:
> > Co-processor needs some information about connected usb device.
> > It's proper to pass information after usb device gets address when
> > getting "Set Address" command. It supports vendors to implement it
> > using xhci overrides. There're several power scenarios depending
> > on vendors. It gives vendors flexibilty to meet their power requirement.
> > They can override suspend and resume of root hub.
> > 
> > Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> > ---
> >  drivers/usb/host/xhci.c | 6 ++++++
> >  drivers/usb/host/xhci.h | 4 ++++
> >  2 files changed, 10 insertions(+)
> > 
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index 5ccf1bbe8732..8b3df1302650 100644
> > --- a/drivers/usb/host/xhci.c
> > +++ b/drivers/usb/host/xhci.c
> > @@ -5555,6 +5555,12 @@ void xhci_init_driver(struct hc_driver *drv,
> >  			drv->check_bandwidth = over->check_bandwidth;
> >  		if (over->reset_bandwidth)
> >  			drv->reset_bandwidth = over->reset_bandwidth;
> > +		if (over->address_device)
> > +			drv->address_device = over->address_device;
> > +		if (over->bus_suspend)
> > +			drv->bus_suspend = over->bus_suspend;
> > +		if (over->bus_resume)
> > +			drv->bus_resume = over->bus_resume;
> >  	}
> >  }
> >  EXPORT_SYMBOL_GPL(xhci_init_driver);
> > diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> > index 3a414a2f41f0..5bc621e77762 100644
> > --- a/drivers/usb/host/xhci.h
> > +++ b/drivers/usb/host/xhci.h
> > @@ -1947,6 +1947,9 @@ struct xhci_driver_overrides {
> >  			     struct usb_host_endpoint *ep);
> >  	int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
> >  	void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
> > +	int (*address_device)(struct usb_hcd *hcd, struct usb_device *udev);
> > +	int (*bus_suspend)(struct usb_hcd *hcd);
> > +	int (*bus_resume)(struct usb_hcd *hcd);
> >  };
> >  
> >  #define	XHCI_CFC_DELAY		10
> > @@ -2103,6 +2106,7 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> >  		       struct usb_host_endpoint *ep);
> >  int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
> >  void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
> > +int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
> 
> You do not use this function in this change, why include it in here?
> 
> Please reorganize your patch series to only include what you need for
> each step, as-is it's kind of out-of-order and might not build at each
> step along the way (or it might, it's hard to determine...)
> 

This patch is to add function pointers. xhci-exynos or other user could use it.
If I reorganize them as you said, all patches depend on xhci-exynos.
That's because hooks and override are only used in xhci-exynos for now.
I don't want user driver effects common files like xhci platform.
I've tried removing dependancies.. That's why I split patches like that.

Best Regards,
Jung Daehwan.

> thanks,
> 
> greg k-h
>