[PATCH v3 4/4] usb: xhci-mtk: use first-fit for LS/FS

[Ikjoon Jang]

On Fri, May 7, 2021 at 10:11 AM Chunfeng Yun <chunfeng.yun at mediatek.com> wrote:
>
> Use first-fit instead of best-fit for LS/FS devices under TT,
> we found that best-fit will consume more bandwidth for some
> cases.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>

Reviewed-and-Tested-by: Ikjoon Jang <ikjn at chromium.org>

> ---
> v3: no changes
> ---
>  drivers/usb/host/xhci-mtk-sch.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
> index 9fb75085e40f..c07411d9b16f 100644
> --- a/drivers/usb/host/xhci-mtk-sch.c
> +++ b/drivers/usb/host/xhci-mtk-sch.c
> @@ -634,6 +634,11 @@ static int check_sch_bw(struct mu3h_sch_bw_info *sch_bw,
>                         min_bw = worst_bw;
>                         min_index = offset;
>                 }
> +
> +               /* use first-fit for LS/FS */
> +               if (sch_ep->sch_tt && min_index >= 0)
> +                       break;
> +
>                 if (min_bw == 0)
>                         break;
>         }
> --
> 2.18.0
>