From: John Youn <John.Youn-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
To: Caesar Wang
<caesar.upstream-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
John Youn <John.Youn-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
Cc: "Huang, Tao" <huangtao-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
"Heiko Stuebner" <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>,
"Doug Anderson"
<dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
"Felipe Balbi" <balbi-l0cyMroinI0@public.gmane.org>,
"open list:ARM/Rockchip SoC..."
<linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
吴良峰 <wulf-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Subject: Re: [Bug] usb: dwc2: Add functions to set and clear force mode
Date: Wed, 3 Feb 2016 01:08:01 +0000 [thread overview]
Message-ID: <2B3535C5ECE8B5419E3ECBE30077290901DC4322F0@US01WEMBX2.internal.synopsys.com> (raw)
In-Reply-To: 56B14B6D.1060808@gmail.com
On 2/2/2016 4:36 PM, Caesar Wang wrote:
> Hi John,
>
> 在 2016年02月03日 08:03, John Youn 写道:
>> On 2/1/2016 6:53 PM, Caesar Wang wrote:
>>> John,
>>>
>>> I will suggest the msleep(25) delay should put in
>>> 'dwc2_force_dr_mode()' instead of the 'dwc2_clear_force_mode()'
>>>
>> Hi Caesar,
>>
>> Are you saying that just msleep(25) in that function like this solves
>> your issue?
>>
>> diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
>> index 39a0fa8..e8a9688 100644
>> --- a/drivers/usb/dwc2/core.c
>> +++ b/drivers/usb/dwc2/core.c
>> @@ -625,6 +625,8 @@ void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg)
>> __func__, hsotg->dr_mode);
>> break;
>> }
>> +
>> + msleep(25);
>
> Yep, that will solve this issue.
>
Ok thanks. Though that still seems strange since you should be getting
the msleep(25) from either the dwc2_force_mode() or
dwc2_clear_force_mode().
Can you check if the following patch works?
If so, I think we can go with that to fix the regression for
now. Otherwise I'll just add the extra msleep(25) and revisit this
later.
Regards,
John
---->8----
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index e991d55..13c060c 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -576,7 +576,6 @@ static bool dwc2_force_mode(struct dwc2_hsotg *hsotg, bool host)
gusbcfg |= set;
dwc2_writel(gusbcfg, hsotg->regs + GUSBCFG);
- msleep(25);
return true;
}
@@ -596,7 +595,6 @@ static void dwc2_clear_force_mode(struct dwc2_hsotg *hsotg)
* NOTE: This long sleep is _very_ important, otherwise the core will
* not stay in host mode after a connector ID change!
*/
- msleep(25);
}
/*
@@ -619,6 +617,8 @@ void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg)
__func__, hsotg->dr_mode);
break;
}
+
+ msleep(25);
}
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next prev parent reply other threads:[~2016-02-03 1:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <56A7603C.1000409@rock-chips.com>
[not found] ` <56A7603C.1000409-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-01-26 16:05 ` [Bug] usb: dwc2: Add functions to set and clear force mode Doug Anderson
[not found] ` <CAD=FV=Xk4v=1QMYG9XmXh6hJLKU6i_wVakOArF1du-Z_4_+Neg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-01-27 2:12 ` Caesar Wang
[not found] ` <56A8277F.9-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-01-29 19:11 ` Doug Anderson
[not found] ` <CAD=FV=Uab6H6sFVj_bPRs7H4HcBi2pqZK3HDCHQxC+EDk=inDA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-01 11:12 ` Caesar Wang
[not found] ` <56AF3D80.90807-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-02-01 11:13 ` Caesar Wang
2016-02-01 23:31 ` John Youn
[not found] ` <2B3535C5ECE8B5419E3ECBE30077290901DC42FD26-Yu2iAY70zvrYN67daEjeMPufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2016-02-02 2:42 ` Caesar Wang
[not found] ` <56B01785.3030803-9Onoh4P/yGk@public.gmane.org>
2016-02-02 2:53 ` Caesar Wang
2016-02-03 0:03 ` John Youn
[not found] ` <2B3535C5ECE8B5419E3ECBE30077290901DC431FDB-Yu2iAY70zvrYN67daEjeMPufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2016-02-03 0:35 ` Caesar Wang
2016-02-03 1:08 ` John Youn [this message]
[not found] ` <2B3535C5ECE8B5419E3ECBE30077290901DC4322F0-Yu2iAY70zvrYN67daEjeMPufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2016-02-03 1:10 ` Caesar Wang
2016-02-03 1:32 ` John Youn
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