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Groups > linux.kernel > #1398709
| From | Peter Chen <hzpeterchen@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface |
| Date | 2016-05-11 08:30 +0200 |
| Message-ID | <rxvOG-2AY-7@gated-at.bofh.it> (permalink) |
| References | (3 earlier) <rwPZ8-2Mv-13@gated-at.bofh.it> <rx6wW-2kR-7@gated-at.bofh.it> <rxaqS-6fU-37@gated-at.bofh.it> <rxb3A-70Q-25@gated-at.bofh.it> <rxc9j-84z-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, May 10, 2016 at 12:20:28PM +0300, Roger Quadros wrote:
> On 10/05/16 11:03, Jun Li wrote:
> > Hi
> >
> >> -----Original Message-----
> >> From: Roger Quadros [mailto:rogerq@ti.com]
> >> Sent: Tuesday, May 10, 2016 3:35 PM
> >> To: Peter Chen <hzpeterchen@gmail.com>
> >> Cc: peter.chen@freescale.com; stern@rowland.harvard.edu; balbi@kernel.org;
> >> gregkh@linuxfoundation.org; dan.j.williams@intel.com; jun.li@freescale.com;
> >> mathias.nyman@linux.intel.com; tony@atomide.com; Joao.Pinto@synopsys.com;
> >> abrestic@chromium.org; yoshihiro.shimoda.uh@renesas.com; linux-
> >> usb@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> >> omap@vger.kernel.org; devicetree@vger.kernel.org
> >> Subject: Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface
> >>
> >> On 10/05/16 06:14, Peter Chen wrote:
> >>> On Mon, May 09, 2016 at 12:45:38PM +0300, Roger Quadros wrote:
> >>>> On 06/05/16 12:41, Peter Chen wrote:
> >>>>> On Mon, May 02, 2016 at 03:18:46PM +0300, Roger Quadros wrote:
> >>>>>> The OTG core will use struct otg_hcd_ops to interface with the HCD
> >>>>>> controller.
> >>>>>>
> >>>>>> The main purpose of this interface is to avoid directly calling HCD
> >>>>>> APIs from the OTG core as they wouldn't be defined in the built-in
> >>>>>> symbol table if CONFIG_USB is m.
> >>>>>>
> >>>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
> >>>>>> Acked-by: Peter Chen <peter.chen@nxp.com>
> >>>>>
> >>>>> Roger, after thinking more, I still think current dependency between
> >>>>> OTG, HCD and gadget are too complicated. Since the OTG can't work if
> >>>>> it is built as module, I suggest letting OTG depends on HCD &&
> >>>>> USB_GADGET, and it is a boolean, in that case, we don't need to
> >>>>> export any HCD and gadget ops, things will be much simpler.
> >>>>> What's your opinion?
> >>>>
> >>>> How will it work if HCD and USB_GADGET are modules and OTG is built-in?
> >>>>
> >>>
> >>> The OTG will not be compiled at this situation, since it is boolean.
> >>> In fact, like I mentioned at above, OTG or USB function can't work if
> >>> it is built as module.
> >>
> >> Isn't this a limitation?
> >> As per the current implementation dual role works fine even with both
> >> USB_GADGET and HCD as module.
> >
> > My understand: only make sense for pass build, host can't work before
> > gadget modules loaded; gadget can't work before hcd loaded, nothing
> > can work before all drivers are loaded.
>
> I can make OTG depend on GADGET and HCD, no issue with that.
> But we can't get rid of the OTG to HCD/Gadged interfaces as we want things
> to work with GADGET and HCD as modules.
>
Let's make OTG depends on gadget and hcd at Kconfig, and keep others
unchanging, if no one objects it.
Peter
> >
> >>
> >> In the real world it is unlikely that GADGET and HCD will be built-in.
> >
> > Why? User enable USB_OTG means both drivers should be enabled anyway.
>
> Enabled, but not necessarily built-in. Most distributions don't have them
> as built-in.
>
> But let's not argue in that direction. Let's say that they can be either
> built-in or modules.
>
> > Even in non-OTG case, both may be built-in for machine with 2 ports
> > (one port is host only, the other one is peripheral only).
>
> Sure. Every system designer is free to select the configuration.
>
> >
> > A general question, 2 drivers depends on each other, allowable?
>
> I don't thing that's possible. Kconfig will complain.
> http://lxr.free-electrons.com/source/Documentation/kbuild/kconfig-language.txt#L397
>
> cheers,
> -roger
>
> >>>>>
> >>>>>> ---
> >>>>>> include/linux/usb/hcd.h | 24 ++++++++++++++++++++++++
> >>>>>> 1 file changed, 24 insertions(+)
> >>>>>>
> >>>>>> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> >>>>>> index b98f831..861ccaa 100644
> >>>>>> --- a/include/linux/usb/hcd.h
> >>>>>> +++ b/include/linux/usb/hcd.h
> >>>>>> @@ -399,6 +399,30 @@ struct hc_driver {
> >>>>>>
> >>>>>> };
> >>>>>>
> >>>>>> +/**
> >>>>>> + * struct otg_hcd_ops - Interface between OTG core and HCD
> >>>>>> + *
> >>>>>> + * Provided by the HCD core to allow the OTG core to interface
> >>>>>> +with the HCD
> >>>>>> + *
> >>>>>> + * @add: function to add the HCD
> >>>>>> + * @remove: function to remove the HCD
> >>>>>> + * @usb_bus_start_enum: function to immediately start bus
> >>>>>> +enumeration
> >>>>>> + * @usb_control_msg: function to build and send of a control urb
> >>>>>> + * @usb_hub_find_child: function to get pointer to the child
> >>>>>> +device */ struct otg_hcd_ops {
> >>>>>> + int (*add)(struct usb_hcd *hcd,
> >>>>>> + unsigned int irqnum, unsigned long irqflags);
> >>>>>> + void (*remove)(struct usb_hcd *hcd);
> >>>>>> + int (*usb_bus_start_enum)(struct usb_bus *bus, unsigned int
> >> port_num);
> >>>>>> + int (*usb_control_msg)(struct usb_device *dev, unsigned int
> >> pipe,
> >>>>>> + __u8 request, __u8 requesttype, __u16 value,
> >>>>>> + __u16 index, void *data, __u16 size,
> >>>>>> + int timeout);
> >>>>>> + struct usb_device * (*usb_hub_find_child)(struct usb_device
> >> *hdev,
> >>>>>> + int port1);
> >>>>>> +};
> >>>>>> +
> >>>>>> static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd) {
> >>>>>> return hcd->driver->flags & HCD_BH;
> >>>>>> --
> >>>>>> 2.7.4
> >>>>>>
> >>>>>> --
> >>>>>> To unsubscribe from this list: send the line "unsubscribe
> >>>>>> linux-usb" in the body of a message to majordomo@vger.kernel.org
> >>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
> >>>>>
> >>>
--
Best Regards,
Peter Chen
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[PATCH v7 00/14] USB OTG/dual-role framework Roger Quadros <rogerq@ti.com> - 2016-05-02 14:20 +0200
[PATCH v7 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros <rogerq@ti.com> - 2016-05-02 14:20 +0200
Re: [PATCH v7 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 10:30 +0200
[PATCH v7 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 10:40 +0200
[PATCH v7 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 09/14] usb: of: add an API to get OTG device from USB controller node Rob Herring <robh@kernel.org> - 2016-05-04 15:20 +0200
Re: [PATCH v7 09/14] usb: of: add an API to get OTG device from USB controller node Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 10:50 +0200
Re: [PATCH v7 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros <rogerq@ti.com> - 2016-05-11 13:10 +0200
[PATCH v7 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 11/14] usb: otg: use dev_dbg() instead of VDBG() Peter Chen <hzpeterchen@gmail.com> - 2016-05-06 11:20 +0200
Re: [PATCH v7 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros <rogerq@ti.com> - 2016-05-09 11:50 +0200
Re: [PATCH v7 11/14] usb: otg: use dev_dbg() instead of VDBG() Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 11:00 +0200
[PATCH v7 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 14/14] usb: host: xhci-plat: Add otg device to platform data Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 11:10 +0200
[PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Peter Chen <hzpeterchen@gmail.com> - 2016-05-06 11:50 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros <rogerq@ti.com> - 2016-05-09 11:50 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Peter Chen <hzpeterchen@gmail.com> - 2016-05-10 05:30 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros <rogerq@ti.com> - 2016-05-10 09:40 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Felipe Balbi <balbi@kernel.org> - 2016-05-10 10:20 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros <rogerq@ti.com> - 2016-05-10 11:20 +0200
RE: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Jun Li <jun.li@nxp.com> - 2016-05-10 10:20 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros <rogerq@ti.com> - 2016-05-10 11:30 +0200
Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 08:30 +0200
[PATCH v7 12/14] usb: hcd: Adapt to OTG core Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 12/14] usb: hcd: Adapt to OTG core Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 11:10 +0200
[PATCH v7 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 01/14] usb: hcd: Initialize hcd->flags to 0 Peter Chen <hzpeterchen@gmail.com> - 2016-05-06 11:20 +0200
[PATCH v7 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
[PATCH v7 08/14] usb: otg: add OTG/dual-role core Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 08/14] usb: otg: add OTG/dual-role core Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 10:50 +0200
Re: [PATCH v7 08/14] usb: otg: add OTG/dual-role core Roger Quadros <rogerq@ti.com> - 2016-05-11 13:10 +0200
[PATCH v7 13/14] usb: gadget: udc: adapt to OTG core Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
[PATCH v7 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 08:20 +0200
Re: [PATCH v7 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros <rogerq@ti.com> - 2016-05-11 13:10 +0200
Re: [PATCH v7 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros <rogerq@ti.com> - 2016-05-11 14:40 +0200
Re: [PATCH v7 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Peter Chen <hzpeterchen@gmail.com> - 2016-05-12 10:30 +0200
Re: [PATCH v7 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros <rogerq@ti.com> - 2016-05-12 10:40 +0200
[PATCH v7 10/14] usb: otg: add hcd companion support Roger Quadros <rogerq@ti.com> - 2016-05-02 14:30 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Rob Herring <robh@kernel.org> - 2016-05-04 15:20 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Roger Quadros <rogerq@ti.com> - 2016-05-04 15:50 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Rob Herring <robh@kernel.org> - 2016-05-11 16:00 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Roger Quadros <rogerq@ti.com> - 2016-05-11 16:20 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Alan Stern <stern@rowland.harvard.edu> - 2016-05-11 16:50 +0200
RE: [PATCH v7 10/14] usb: otg: add hcd companion support Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> - 2016-05-12 06:10 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Roger Quadros <rogerq@ti.com> - 2016-05-12 10:40 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Roger Quadros <rogerq@ti.com> - 2016-05-12 11:40 +0200
RE: [PATCH v7 10/14] usb: otg: add hcd companion support Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> - 2016-05-12 12:40 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Roger Quadros <rogerq@ti.com> - 2016-05-12 14:20 +0200
Re: [PATCH v7 10/14] usb: otg: add hcd companion support Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 11:00 +0200
Re: [PATCH v7 00/14] USB OTG/dual-role framework Peter Chen <hzpeterchen@gmail.com> - 2016-05-11 10:50 +0200
Re: [PATCH v7 00/14] USB OTG/dual-role framework Roger Quadros <rogerq@ti.com> - 2016-05-11 13:10 +0200
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