linux-kernel - Re: [PATCH v4 0/2] usb: override hub device bInterval with device

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Date:   Wed, 4 Dec 2019 10:46:17 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        GregKroah-Hartman <gregkh@...uxfoundation.org>,
        RobHerring <robh+dt@...nel.org>,
        MarkRutland <mark.rutland@....com>,
        AlanStern <stern@...land.harvard.edu>,
        SuwanKim <suwan.kim027@...il.com>,
        "GustavoA . R . Silva" <gustavo@...eddedor.com>,
        linux-kernel@...r.kernel.org,
        Nicolas Boichat <drinkcat@...omium.org>
Subject: Re: [PATCH v4 0/2] usb: override hub device bInterval with device

On Wed, Dec 4, 2019 at 12:40 AM Johan Hovold <johan@...nel.org> wrote:
>
> On Tue, Dec 03, 2019 at 06:15:21PM +0800, Ikjoon Jang wrote:
> > This patchset enables hard wired hub device to use different bInterval
> > from its descriptor when the hub has a combined device node.
> >
> > When we know reducing autosuspend delay for built-in HIDs is better for
> > power saving, we can reduce it to the optimal value. But if a parent hub
> > has a long bInterval, mouse lags a lot from more frequent autosuspend.
> > So this enables overriding bInterval for a hard wired hub device only
> > when we know that reduces the power consumption.
> >
> > Changes in v4
> > - use of_property_read_u32() instead of of_property_read_u8()
>
> What changed in the previous versions?

changes in the previous versions:
v4: use of_property_read_u32() instead of of_property_read_u8()
v3: errata fixed "hub, interval" --> "hub,interval"
v2: do not use unlikely() macro, commit message

>
> Johan