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

[Tim]

Speculation;

Maybe the kernel maintainers prefer to optimistically permit future
products to easily remove workarounds via quirk flags.
Even if data from testing were shown, and it did not impact
performance, code reduction and clarity are desirable.

On Sun, Nov 10, 2019 at 8:58 PM Jun Li <lijun.kernel@xxxxxxxxx> 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?
>
> Li Jun
>
> Tim <elatllat@xxxxxxxxx> ä2019å11æ11æåä äå8:42åéï
> >
> > 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@xxxxxxxxxx> 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@xxxxxxxxx>
> > > > Cc: Jianxin Pan <jianxin.pan@xxxxxxxxxxx>
> > > > Reported-by: Tim <elatllat@xxxxxxxxx>
> > > > Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> > > > ---
> > > >  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@xxxxxxxxxx>