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SubjectRe: [PATCH] usb: chipidea: udc: clear vbus_active flag in udc_stop
Hi

On 10/20/2015 03:28 PM, Peter Chen wrote:
> On Tue, Oct 20, 2015 at 03:09:02PM +0900, Jiada Wang wrote:
>> Hi
>>
>> On 10/20/2015 03:01 PM, Peter Chen wrote:
>>> On Tue, Oct 20, 2015 at 11:29:18AM +0900, Jiada Wang wrote:
>>>> Currently in udc_stop, if vbus_active flag is true, all USB activities
>>>> will be stopped, but vbus_active flag is still left to be true,
>>>> this causes issue, when afterwards driver tries to connect gadget
>>>> device to host, But due to the uncleared vbus_active, some necessary
>>>> setup steps are skipped.
>>>>
>>>> This patch clears vbus_active flag in udc_stop callback.
>>>>
>>>> Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
>>>> ---
>>>> drivers/usb/chipidea/udc.c | 1 +
>>>> 1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
>>>> index 8223fe7..b9ac228 100644
>>>> --- a/drivers/usb/chipidea/udc.c
>>>> +++ b/drivers/usb/chipidea/udc.c
>>>> @@ -1762,6 +1762,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
>>>> spin_lock_irqsave(&ci->lock, flags);
>>>>
>>>> if (ci->vbus_active) {
>>>> + ci->vbus_active = 0;
>>>> hw_device_state(ci, 0);
>>>> if (ci->platdata->notify_event)
>>>> ci->platdata->notify_event(ci,
>>>> --
>>>> 2.4.5
>>>>
>>>
>>> This flag will be handled by vbus interrupt, would you please explain
>>> more what problem you have met?
>> the actual issue I had is,
>> build kernel with USB_OTG_FSM enabled,
>> keep usb cable plugged,
>> load/unload USB gadget module (for example I tried g_zero or g_serial),
>> after unload gadget module once, then the status of vbus_active is not
>> correct,
>> this causes host machine failed to detect gadget device when later
>> gadget device module is loaded again.
>>
>>
>
> ci->vbus_active is only used at non-fsm mode, would you please try below
> fix?
>
> usb: chipidea: otg: gadget module load and unload support
>
> This patch is to support load and unload gadget driver in full OTG mode.
>
> Acked-by: Peter Chen <peter.chen@freescale.com>
> Signed-off-by: Li Jun <jun.li@freescale.com>
> ---
> drivers/usb/chipidea/udc.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index e19d8b8..67cfa04 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -1755,6 +1755,22 @@ static int ci_udc_start(struct usb_gadget *gadget,
> return retval;
> }
>
> +static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
> +{
> + if (!ci_otg_is_fsm_mode(ci))
> + return;
> +
> + mutex_lock(&ci->fsm.lock);
> + if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
> + ci->fsm.a_bidl_adis_tmout = 1;
> + ci_hdrc_otg_fsm_start(ci);
> + } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
> + ci->fsm.protocol = PROTO_UNDEF;
> + ci->fsm.otg->state = OTG_STATE_UNDEFINED;
> + }
> + mutex_unlock(&ci->fsm.lock);
> +}
> +
> /**
> * ci_udc_stop: unregister a gadget driver
> */
> @@ -1779,6 +1795,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
> ci->driver = NULL;
> spin_unlock_irqrestore(&ci->lock, flags);
>
> + ci_udc_stop_for_otg_fsm(ci);
> return 0;
> }
>
>

I will test with this patch and come back with the result,
has this patch been submitted to community?

Thanks,
Jiada


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