linux-kernel - Re: [PATCH v4 04/13] otg-fsm: move usb_bus_start

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Message-ID: <20150908065424.GC7802@shlinux2>
Date:	Tue, 8 Sep 2015 14:54:25 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Roger Quadros <rogerq@...com>
CC:	<stern@...land.harvard.edu>, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <dan.j.williams@...el.com>,
	<jun.li@...escale.com>, <mathias.nyman@...ux.intel.com>,
	<tony@...mide.com>, <Joao.Pinto@...opsys.com>,
	<abrestic@...omium.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v4 04/13] otg-fsm: move usb_bus_start_enum into
 otg-fsm->ops

On Mon, Sep 07, 2015 at 12:57:21PM +0300, Roger Quadros wrote:
> On 07/09/15 04:24, Peter Chen wrote:
> > On Mon, Aug 24, 2015 at 04:21:15PM +0300, Roger Quadros wrote:
> >> This is to prevent missing symbol build error if OTG is
> >> enabled (built-in) and HCD core (CONFIG_USB) is module.
> >>
> >> Signed-off-by: Roger Quadros <rogerq@...com>
> >> Acked-by: Peter Chen <peter.chen@...escale.com>
> >> ---
> >>  drivers/usb/common/usb-otg-fsm.c | 6 ++++--
> >>  drivers/usb/phy/phy-fsl-usb.c    | 2 ++
> >>  include/linux/usb/otg-fsm.h      | 1 +
> >>  3 files changed, 7 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
> >> index a46f29a..6e56c8c 100644
> >> --- a/drivers/usb/common/usb-otg-fsm.c
> >> +++ b/drivers/usb/common/usb-otg-fsm.c
> >> @@ -165,8 +165,10 @@ static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
> >>  		otg_loc_conn(fsm, 0);
> >>  		otg_loc_sof(fsm, 1);
> >>  		otg_set_protocol(fsm, PROTO_HOST);
> >> -		usb_bus_start_enum(fsm->otg->host,
> >> -				fsm->otg->host->otg_port);usb_bus_start_enum
> >> +		if (fsm->ops->start_enum) {
> >> +			fsm->ops->start_enum(fsm->otg->host,
> >> +					     fsm->otg->host->otg_port);
> >> +		}
> >>  		break;
> >>  	case OTG_STATE_A_IDLE:
> >>  		otg_drv_vbus(fsm, 0);
> >> diff --git a/drivers/usb/phy/phy-fsl-usb.c b/drivers/usb/phy/phy-fsl-usb.c
> >> index ee3f2c2..19541ed 100644
> >> --- a/drivers/usb/phy/phy-fsl-usb.c
> >> +++ b/drivers/usb/phy/phy-fsl-usb.c
> >> @@ -783,6 +783,8 @@ static struct otg_fsm_ops fsl_otg_ops = {
> >>  
> >>  	.start_host = fsl_otg_start_host,
> >>  	.start_gadget = fsl_otg_start_gadget,
> >> +
> >> +	.start_enum = usb_bus_start_enum,
> >>  };
> >>  
> >>  /* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
> >> diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
> >> index 672551c..75e82cc 100644
> >> --- a/include/linux/usb/otg-fsm.h
> >> +++ b/include/linux/usb/otg-fsm.h
> >> @@ -199,6 +199,7 @@ struct otg_fsm_ops {
> >>  	void	(*del_timer)(struct otg_fsm *fsm, enum otg_fsm_timer timer);
> >>  	int	(*start_host)(struct otg_fsm *fsm, int on);
> >>  	int	(*start_gadget)(struct otg_fsm *fsm, int on);
> >> +	int	(*start_enum)(struct usb_bus *bus, unsigned port_num);
> >>  };
> >>  
> >>  
> > 
> > Get one build warning:
> > 
> > In file included from /u/home/b29397/work/projects/usb/drivers/usb/chipidea/udc.c:23:0:
> > /u/home/b29397/work/projects/usb/include/linux/usb/otg-fsm.h:207:27: warning: 'struct usb_bus' declared inside parameter list
> >   int (*start_enum)(struct usb_bus *bus, unsigned port_num);
> >                              ^
> > /u/home/b29397/work/projects/usb/include/linux/usb/otg-fsm.h:207:27: warning: its scope is only this definition or declaration, which is probably not what you want
> > 
> > It probably dues to we should not have struct usb_bus* at udc driver
> > 
> How about changing it to struct otg_fsm instead like the other APIs?
> And do we leave usb_bus_start_enum() as it is?
> 

You have defined struct otg_hcd_ops to let otg visit hcd stuff, how
about move this to otg_hcd_ops?

> cheers,
> -roger

-- 

Best Regards,
Peter Chen
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