linux-kernel - Re: [PATCH 03/17] usb: xhci-mtk: get the microframe boundary for ESIT

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Message-ID: <1615168663.32109.5.camel@mhfsdcap03>
Date:   Mon, 8 Mar 2021 09:57:43 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ikjoon Jang <ikjn@...omium.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: Re: [PATCH 03/17] usb: xhci-mtk: get the microframe boundary for
 ESIT

On Fri, 2021-03-05 at 12:13 +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 05.03.2021 12:02, Chunfeng Yun wrote:
> 
> > Tune the boundary for FS/LS ESIT due to CS:
> > For ISOC out-ep, the controller starts transfer data after
> > the first SS; for others, the data is already transfered
> 
>     Transferred.
Ok
> 
> > before the last CS.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >   drivers/usb/host/xhci-mtk-sch.c | 24 +++++++++++++++++++-----
> >   1 file changed, 19 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
> > index 8950d1f10a7f..e3b18dfca874 100644
> > --- a/drivers/usb/host/xhci-mtk-sch.c
> > +++ b/drivers/usb/host/xhci-mtk-sch.c
> > @@ -513,22 +513,35 @@ static void update_sch_tt(struct usb_device *udev,
> >   		list_del(&sch_ep->tt_endpoint);
> >   }
> >   
> > +static u32 get_esit_boundary(struct mu3h_sch_ep_info *sch_ep)
> > +{
> > +	u32 boundary = sch_ep->esit;
> > +
> > +	if (sch_ep->sch_tt) { /* LS/FS with TT */
> > +		/* tune for CS */
> > +		if (sch_ep->ep_type != ISOC_OUT_EP)
> > +			boundary += 1;
> 
>     Why not:
> 
> 			boundary++;
Forgot it, it's modified from "boundary = sch_ep->esit + 1;"

Thanks
> 
> > +		else if (boundary > 1) /* normally esit >= 8 for FS/LS */
> > +			boundary -= 1;
> 
> 			boundary--;
> 
> [...]
> 
> MBR, Sergei