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

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Message-ID: <CA+3zgmtWQwdJG5NT-t7__Mqt5u_U3m4+HEL6p4PWxx5NES7_AQ@mail.gmail.com>
Date:   Tue, 10 Dec 2019 19:45:54 -0500
From:   Tim <elatllat@...il.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Jun Li <lijun.kernel@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        "khilman@...libre.com" <khilman@...libre.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.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

Just writing to say;
this patch is still performing well on 5.5.0-rc1, and
there is no speed improvement by adding DWC3_GUCTL_NAK_PER_ENH_HS BIT(17)
    I get up to 3890 ms second lag with "ping -s 5120 $IP" when
copying between USB HDDs either way, but at least this patch stops the
crashing.


On Tue, Dec 10, 2019 at 3:55 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> Hi,
>
> On 12/11/2019 21:03, Thinh Nguyen wrote:
> > Hi,
> >
> > Jun Li wrote:
> >> This bug exists on all current versions per information I got from Synopsys.
> >> + Thinh Nguyen <thinhn@...opsys.com>.
> >>
> >> Li Jun
> >
> > The GUCTL1.PARKMODE_DISABLE_SS is only available in dwc_usb3 controller
> > running in host mode. This should not be set for other IPs.
> >
> > This can be disabled by default based on IP, but I recommend to have a
> > property to enable this feature for devices that need this.
>
> Thanks, so this patchset is the right way to solve this.
>
> Felipe, would it be possible to have it merged for next release ?
> Should I resend it ?
>
> Thanks,
> Neil
>
> >
> >
> >>
> >> 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://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.kernel.org_patch_11164515_&d=DwIFaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=u9FYoxKtyhjrGFcyixFYqTjw1ZX0VsG2d8FCmzkTY-w&m=BCfRHM9e86039Su0-QvK_yUjNnYrnl_BcvxTtViypT8&s=aV5u7uxNX6oTLB3_-qNuzrNvyiqx_rPC6P9TMqG-LNE&e=
> >>>>>
> >>>>>
> >>>>>
> >>>>> 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>
> >
> > BR,
> > Thinh
> >
>