linux-kernel - Re: [PATCH 1/3] doc: dt: bindings: usb: dwc3: Update entries for disabling SS instances in park mode

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Date:   Tue, 12 Nov 2019 18:51:10 +0800
From:   Jun Li <lijun.kernel@...il.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc:     Tim <elatllat@...il.com>, Felipe Balbi <balbi@...nel.org>,
        khilman@...libre.com, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dongjin Kim <tobetter@...il.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 1/3] doc: dt: bindings: usb: dwc3: Update entries for
 disabling SS instances in park mode

This bug exists on all current versions per information I got from Synopsys.
+ Thinh Nguyen <thinhn@...opsys.com>.

Li Jun

Neil Armstrong <narmstrong@...libre.com> 于2019年11月12日周二 下午5:00写道：
>
> Hi Li,
>
> On 11/11/2019 02:58, Jun Li wrote:
> > Hi Neil
> >
> > As I got the information from Synopsys, this bug exists on current IP versions,
> > and per my tests with external USB3 hub + 2 Super speed udisks on data
> > read by dd, I can reproduce this issue with different kernel versions, also I
> > didn't see obvious performance drop by dd tests after disable park mode for
> > super speed, so should we just disable it by default so no need a quirk?
>
> I don't have any opinion on this, I think the USB & DWC3 maintainers should decide
> how to handle this.
>
> Did Synopsys specified a range of affected IP version ?
>
> Neil
>
> >
> > Li Jun
> >
> > Tim <elatllat@...il.com> 于2019年11月11日周一 上午8:42写道：
> >>
> >> Thanks for working on this Neil,
> >> Is there something that needs doing for this patch to make it into 5.3 or 5.4?
> >> As previously mentioned the patch set fixes the issue on affected hardware;
> >>     https://patchwork.kernel.org/patch/11164515/
> >>
> >>
> >>
> >> On Wed, Oct 23, 2019 at 4:11 PM Rob Herring <robh@...nel.org> wrote:
> >>>
> >>> On Mon, Oct 14, 2019 at 04:17:16PM +0200, Neil Armstrong wrote:
> >>>> This patch updates the documentation with the information related
> >>>> to the quirks that needs to be added for disabling all SuperSpeed XHCi
> >>>> instances in park mode.
> >>>>
> >>>> CC: Dongjin Kim <tobetter@...il.com>
> >>>> Cc: Jianxin Pan <jianxin.pan@...ogic.com>
> >>>> Reported-by: Tim <elatllat@...il.com>
> >>>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> >>>> ---
> >>>>  Documentation/devicetree/bindings/usb/dwc3.txt | 2 ++
> >>>>  1 file changed, 2 insertions(+)
> >>>
> >>> Sigh, what's one more to the never ending list of quirks...
> >>>
> >>> Acked-by: Rob Herring <robh@...nel.org>
>