linux-kernel - Re: [RFC] usb: dwc2: hcd: fix split schedule issue

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Message-ID: <56406E09.4030903@rock-chips.com>
Date:	Mon, 9 Nov 2015 17:57:29 +0800
From:	Yunzhi Li <lyz@...k-chips.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	John Youn <John.Youn@...opsys.com>,
	Julius Werner <jwerner@...gle.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	wulf <wulf@...k-chips.com>,
	Kever Yang <kever.yang@...k-chips.com>,
	caesar <caesar.wang@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	rockchip-discuss <rockchip-discuss@...omium.org>
Subject: Re: [RFC] usb: dwc2: hcd: fix split schedule issue

hi Doug

在 2015/11/7 7:56, Doug Anderson 写道:
> lyz@,
>
> On Fri, Nov 6, 2015 at 1:36 AM, Yunzhi Li <lyz@...k-chips.com> wrote:
>> Fix dwc2 split schedule sequence issue. Not schedule a SSPLIT_IN
>> packet between SSPLIT-begin and SSPLIT-end.
>>
>> Signed-off-by: Yunzhi Li <lyz@...k-chips.com>
>> ---
>>   drivers/usb/dwc2/hcd.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
>> index e79baf7..a32ed01 100644
>> --- a/drivers/usb/dwc2/hcd.c
>> +++ b/drivers/usb/dwc2/hcd.c
>> @@ -1122,6 +1122,10 @@ static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
>>                          break;
>>                  }
>>
>> +               if (qh->channel->xact_pos == DWC2_HCSPLT_XACTPOS_BEGIN ||
>> +                   qh->channel->xact_pos == DWC2_HCSPLT_XACTPOS_MID)
>> +                       break;
>> +
>>                  /*
>>                   * In Slave mode, stay on the current transfer until there is
>>                   * nothing more to do or the high-bandwidth request count is
> Just a quite note to say that this doesn't seem to resolve the weird
> errors I'm seeing with the "Microsoft Wireless Keyboard 2000" that I
> have.  I see split transaction errors in a USB analyzer with just that
> hooked up behind a hub (don't even need any other USB devices).
>
> ...it is possible that there are two unrelated problems here, but it's
> also possible that there's some bigger root cause that will fix both
> of our problems.  I've been poking at things a bit too, but so far no
> luck...
>
> -Doug
>
It seems that we are debugging two different issues, your new patch which rewrite
the microframe scheduler doesn't resolve my problem. My patch fix chrome-os issue
#46547 not related to the particular Microsoft keyboard any keyboard could be used
to reproduce the issue.


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