linux-kernel - Re: [PATCH 2/3] usb: xhci-mtk: fix UAS issue by XHCI_BROKEN

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Date:   Mon, 1 Feb 2021 09:47:42 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Rosen Penev <rosenp@...il.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Ikjoon Jang <ikjn@...omium.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] usb: xhci-mtk: fix UAS issue by XHCI_BROKEN_STREAMS
 quirk

On Sun, 2021-01-31 at 15:13 +0100, Matthias Brugger wrote:
> 
> On 24/12/2020 08:18, Chunfeng Yun wrote:
> > On Wed, 2020-12-16 at 19:43 -0800, Rosen Penev wrote:
> >> On Wed, Dec 16, 2020 at 6:29 PM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
> >>>
> >>> On Wed, 2020-12-16 at 20:28 +0800, Nicolas Boichat wrote:
> >>>> On Wed, Dec 16, 2020 at 7:53 PM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
> [...]
> >>>>>         mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
> >>>>> +       mtk->broken_streams =
> >>>>> +               of_property_read_bool(node, "mediatek,broken_streams_quirk");
> >>>>
> >>>> Would it be better to add a data field to struct of_device_id
> >>>> mtk_xhci_of_match, and enable this quirk on mediatek,mt8173-xhci only?
> >>> This is the common issue for all SoCs (before 2016.06) with 0.96 xHCI
> >>> when the controller don't support bulk stream. If enable this quirk only
> >>> for mt8173, then for other SoCs, the compatible need include
> >>> "mediatek,mt8173-xhci" in dts, this may be not flexible for some cases,
> >>> e.g. a new SoC has the broken stream as mt8173, but also has another
> >>> different quirk, the way you suggested will not handle it.
> >>> And I plan to remove "mediatek,mt8173-xhci" in mtk_xhci_of_match after
> >>> converting the binding to YMAL.
> >> I'm guessing this also applies to mt7621?
> > Yes, mt7621 doesn't support bulk stream
> > 
> 
> Then please provide patches to the DTSI for all SoCs that have this problem.
> Either as a follow-up or as part of this series, if you need to resubmit.
Ok, I'll send new version, and also try other way to fix it without add
property in DTS, thanks

> 
> Regards,
> Matthias