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

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Date:   Fri, 5 Mar 2021 10:16:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>
Cc:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        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, Mar 05, 2021 at 12:13:33PM +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.
> 
> > 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++;
> 
> > +		else if (boundary > 1) /* normally esit >= 8 for FS/LS */
> > +			boundary -= 1;
> 
> 			boundary--;

Doesn't matter either way, it's the author's choice.

greg k-h