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Subject: Re: [PATCH 03/17] usb: xhci-mtk: get the microframe boundary for ESIT
To:     Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Mathias Nyman <mathias.nyman@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Ikjoon Jang <ikjn@chromium.org>
Cc:     Matthias Brugger <matthias.bgg@gmail.com>,
        linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        Nicolas Boichat <drinkcat@chromium.org>,
        Eddie Hung <eddie.hung@mediatek.com>
References: <1614934975-15188-1-git-send-email-chunfeng.yun@mediatek.com>
 <1614934975-15188-3-git-send-email-chunfeng.yun@mediatek.com>
From:   Sergei Shtylyov <sergei.shtylyov@gmail.com>
Organization: Brain-dead Software
Message-ID: <cfa6dccb-d784-06fd-e5bc-0b53d105b7f6@gmail.com>
Date:   Fri, 5 Mar 2021 12:13:33 +0300
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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@mediatek.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--;

[...]

MBR, Sergei