Hi Sergei: >-----Original Message----- >From: Sergei Shtylyov [mailto:sergei.shtylyov@xxxxxxxxxxxxxxxxxx] >Sent: Friday, December 14, 2018 7:18 PM >To: Zengtao (B) <prime.zeng@xxxxxxxxxxxxx>; balbi@xxxxxxxxxx >Cc: liangshengjun <liangshengjun@xxxxxxxxxxxxx>; Greg Kroah-Hartman ><gregkh@xxxxxxxxxxxxxxxxxxx>; linux-usb@xxxxxxxxxxxxxxx; >linux-kernel@xxxxxxxxxxxxxxx >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 framenumber to make sure that it's not out of date.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@xxxxxxxxxxxxx> >> Signed-off-by: Zeng Tao <prime.zeng@xxxxxxxxxxxxx> >[...] >> 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
