linux-kernel - Re: [PATCH v3 04/11] otg-fsm: move usb_bus_start

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Message-ID: <55A66073.5010800@ti.com>
Date:	Wed, 15 Jul 2015 16:30:27 +0300
From:	Roger Quadros <rogerq@...com>
To:	Peter Chen <peter.chen@...escale.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>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 04/11] otg-fsm: move usb_bus_start_enum into otg-fsm->ops

On 14/07/15 03:34, Peter Chen wrote:
> On Mon, Jul 13, 2015 at 01:13:54PM +0300, Roger Quadros wrote:
>> Peter,
>>
>> On 13/07/15 04:58, Peter Chen wrote:
>>> On Wed, Jul 08, 2015 at 01:19:30PM +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.
>>>>
>>>
>>> We may let the OTG-DRD/OTG-FSM depends on CONFIG_USB to fix it.
>>
>> CONFIG_OTG already depends on CONFIG_USB as it is a sub-option of
>> CONFIG_USB. It doesn't depend on CONFIG_USB_GADGET and that can
>> be fixed.
>>
>> But dependency is not the problem here. Symbols not available to
>> OTG driver when USB/GADGET is 'm' is the problem.
>>
>> e.g.
>> CONFIG_USB_OTG is always built-in.
>> we need to work if CONFIG_USB is 'm'/'y'
>> _and_ if CONFIG_USB_GADGET is 'm'/'y'
>>
> 
> below should fix this issue, but we may need to make some
> changes for code which are defined by CONFIG_USB_OTG.
> 
> diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
> index a99c89e..5e374ad 100644
> --- a/drivers/usb/core/Kconfig
> +++ b/drivers/usb/core/Kconfig
> @@ -42,8 +42,9 @@ config USB_DYNAMIC_MINORS
>           If you are unsure about this, say N here.
> 
> config USB_OTG
> -       bool "OTG support"
> +       tristate "OTG support"
> 	depends on PM
> +       depends on USB && USB_GADGET
> 	default n
>    help
>      The most notable feature of
>      USB OTG is support for a

With this USB_OTG will become 'm' when either USB or USB_GADGET is m
and will break if either USB or USB_GADGET is made y as all OTG core
API symbols won't be available. :)

cheers,
-roger

>>
>>>
>>> Peter
>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...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 1873eb3..156fd25 100644
>>>> --- a/drivers/usb/common/usb-otg-fsm.c
>>>> +++ b/drivers/usb/common/usb-otg-fsm.c
>>>> @@ -166,8 +166,10 @@ 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);
>>>> +		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 c631dde..22d8baa 100644
>>>> --- a/include/linux/usb/otg-fsm.h
>>>> +++ b/include/linux/usb/otg-fsm.h
>>>> @@ -198,6 +198,7 @@ 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);
>>>>  };
>>>>  
>>>>  
>>>> -- 
>>>> 2.1.4
>>>>
>>>
> 
--
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