Am 25.08.2016 um 08:44 schrieb Peter Chen:
> On Thu, Aug 25, 2016 at 07:06:12AM +0200, Stefan Wahren wrote:
>> Hi Alan,
>>
>> i tried the following patch:
>> --- a/drivers/usb/chipidea/host.c
>> +++ b/drivers/usb/chipidea/host.c
>> @@ -185,6 +185,8 @@ static void host_stop(struct ci_hdrc *ci)
>>
>> if (hcd) {
>> usb_remove_hcd(hcd);
>> + ci_role_stop(ci);
>> + synchronize_irq(ci->irq);
> Would you please just add below line to see if this problem can be
> fixed?
> + ci->role = CI_ROLE_END;
>
> When ci->role is CI_ROLE_END, neither host nor device interrupt handler
> will run.
I would add this before synchronize_irq() as Alan suggested.
>
> What is your controller role? (dr_mode = host, peripheral or otg)?
I'm using the unmodified arch/arm/boot/dts/imx23-olinuxino.dts so:
dr_mode = host
> Besides, you would please add below line at core.c to show what
> interrupt occurs at that time:
>
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index b5c155b..e6b8a7e 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -596,6 +596,12 @@ static irqreturn_t ci_irq(int irq, void *data)
> /* Handle device/host interrupt */
> if (ci->role != CI_ROLE_END)
> ret = ci_role(ci)->irq(ci);
> + else
> + dev_info(ci->dev, "otgsc:0x%x, usbsts:0x%x\n",
> + hw_read_otgsc(ci, ~0),
> + hw_read_intr_status(ci) &
> hw_read_intr_enable(ci)
> + );
> +
>
> return ret;
> }
>
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