linux-kernel - RE: [PATCH] usb: dwc3: gadget: fix miss isoc issue introduced by IRQ latency

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Message-ID: <678F3D1BB717D949B966B68EAEB446ED24E217CD@dggemm526-mbx.china.huawei.com>
Date:   Mon, 17 Dec 2018 01:54:31 +0000
From:   "Zengtao (B)" <prime.zeng@...ilicon.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        "balbi@...nel.org" <balbi@...nel.org>
CC:     liangshengjun <liangshengjun@...ilicon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: dwc3: gadget: fix miss isoc issue introduced by
 IRQ latency

Hi Sergei:

>-----Original Message-----
>From: Sergei Shtylyov [mailto:sergei.shtylyov@...entembedded.com]
>Sent: Friday, December 14, 2018 7:18 PM
>To: Zengtao (B) <prime.zeng@...ilicon.com>; balbi@...nel.org
>Cc: liangshengjun <liangshengjun@...ilicon.com>; Greg Kroah-Hartman
><gregkh@...uxfoundation.org>; linux-usb@...r.kernel.org;
>linux-kernel@...r.kernel.org
>Subject: Re: [PATCH] usb: dwc3: gadget: fix miss isoc issue introduced by
>IRQ latency
>
>Hello!
>
>On 12/14/2018 07:32 PM, Zeng Tao wrote:
>
>> If it's a busy system, some times when we start an isoc transfer, the
>> framenumber get from the event buffer may be already elasped, in this
>
>   Frame number? Else my spell checker trips. :-)
>
>>  case, we will get all the packets dropped due to miss isoc. And we
>> turn
>
>   Remove the leading space, please.
>
>> into transfer nothing, to fix this issue, we need to fix the
>> framenumber to make sure that it's not out of date.
>>
>> Signed-off-by: Liang Shengjun <liangshengjun@...ilicon.com>
>> Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com>
>[...]
>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>> index 9f92ee0..b63bd72 100644
>> --- a/drivers/usb/dwc3/gadget.c
>> +++ b/drivers/usb/dwc3/gadget.c
>> @@ -1263,6 +1263,15 @@ static int __dwc3_gadget_get_frame(struct
>dwc3 *dwc)
>>  	return DWC3_DSTS_SOFFN(reg);
>>  }
>>
>> +static bool __dwc3_gadget_target_frame_elapsed(struct dwc3_ep
>*dep) {
>> +	u16 cframe =  __dwc3_gadget_get_frame(dep->dwc);
>> +	u16 eframe = dep->frame_number &
>DWC3_EVENT_PRAM_SOFFN_MASK;
>> +
>> +	return (((eframe - cframe) & DWC3_EVENT_PRAM_SOFFN_MASK)
>> +		> DWC3_EVENT_PRAM_MAX_SOFFN / 2);
>
>   Please leave > on the previous line.
>   And you surely know that the outer parens are unnecessary? :-)
>

Thanks for your kindly corrections. :-), I will apply them in the patch if we need.

>[...]
>
>MBR, Sergei