linux-kernel - RE: [PATCH] usb: dwc2: gadget: fix missing process for isoc descriptor dma mode

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Date:   Thu, 31 May 2018 01:17:40 +0000
From:   "Zengtao (B)" <prime.zeng@...ilicon.com>
To:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
CC:     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: dwc2: gadget: fix missing process for isoc
 descriptor dma mode

Hi Minus:

>-----Original Message-----
>From: Minas Harutyunyan [mailto:Minas.Harutyunyan@...opsys.com]
>Sent: Wednesday, May 30, 2018 3:17 PM
>To: Zengtao (B) <prime.zeng@...ilicon.com>;
>Minas.Harutyunyan@...opsys.com
>Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>;
>linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
>Subject: Re: [PATCH] usb: dwc2: gadget: fix missing process for isoc
>descriptor dma mode
>
>Hi Zeng Tao,
>
>On 5/30/2018 9:09 AM, Zeng Tao wrote:
>> If it's the first request to queue, and we are using descriptor dma
>> mode for isoc transfer, we only need to add the request to the queue,
>> and it will be processed in the future nak interrupt handler.
>>
>> Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com>
>> ---
>>   drivers/usb/dwc2/gadget.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
>> index f0d9ccf..48e3a48c 100644
>> --- a/drivers/usb/dwc2/gadget.c
>> +++ b/drivers/usb/dwc2/gadget.c
>> @@ -1365,6 +1365,9 @@ static int dwc2_hsotg_ep_queue(struct
>usb_ep *ep, struct usb_request *req,
>>   			return 0;
>>   		}
>>
>> +		if (using_desc_dma(hs))
>> +			return 0;
>> +
>>   		/* Update current frame number value. */
>>   		hs->frame_number = dwc2_hsotg_read_frameno(hs);
>>   		while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
>>
>
>Actually it considered in "[PATCH] usb: dwc2: Change ISOC DDMA flow"
>before checking is this request first or no:

Yes, it,s.  Thank you for pointing it out.
>
>+	if (using_desc_dma(hs) && hs_ep->isochronous) {
>+		if (hs_ep->target_frame != TARGET_FRAME_INITIAL) {
>+			dwc2_gadget_fill_isoc_desc(hs_ep, hs_req->req.dma,
>+						   hs_req->req.length);
>+		}
>  		return 0;
>  	}
>
>
>Thanks,
>Minas

Regards
Zengtao