Re: [PATCH] usb-musb: keep VBUS on when device is disconnected

From	Tony Lindgren <tony@atomide.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] usb-musb: keep VBUS on when device is disconnected
Date	2017-05-12 19:50 +0200
Message-ID	<tGmRs-830-15@gated-at.bofh.it> (permalink)
References	(5 earlier) <tGj7c-5fh-11@gated-at.bofh.it> <tGkcW-62A-11@gated-at.bofh.it> <tGkFY-6vb-19@gated-at.bofh.it> <tGmy7-7Uc-51@gated-at.bofh.it> <tGmRs-830-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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* Bin Liu <b-liu@ti.com> [170512 10:43]:
> On Fri, May 12, 2017 at 10:21:35AM -0700, Tony Lindgren wrote:
> > * Bin Liu <b-liu@ti.com> [170512 08:24]:
> > > On Fri, May 12, 2017 at 07:58:49AM -0700, Tony Lindgren wrote:
> > > > OK. No better ideas except I think we should probably have a separate
> > > > timer for keeping VBUS on after state changes eventually.
> > > 
> > > Currently with the patch below, VBUS is constantly on for host-only
> > > mode, and this is what we want. Why we need a separate timer? No one
> > > cuts VBUs now for host-only mode.
> > 
> > Oh I was just thinking what we might want to do in the future if
> > we want to cut off VBUS when no devices are connected. If we have
> 
> Okay, I see. But I don't think we will ever want to turn off VBUS when
> no devices attached for host-only mode. Any other controllers do this?
> 
> Turning off VBUS doesn't save us much, because it comes from an external
> power rail, and no one consumes it when no devices are attached.
> 
> I believe keeping the controller idle as what we have now is sufficient.

OK fine with me.

Regards,

Tony

Thread

Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Tony Lindgren <tony@atomide.com> - 2017-05-11 22:30 +0200
  Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Bin Liu <b-liu@ti.com> - 2017-05-11 22:50 +0200
    Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Tony Lindgren <tony@atomide.com> - 2017-05-11 23:10 +0200
      Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Bin Liu <b-liu@ti.com> - 2017-05-12 15:50 +0200
        Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Tony Lindgren <tony@atomide.com> - 2017-05-12 17:00 +0200
          Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Bin Liu <b-liu@ti.com> - 2017-05-12 17:30 +0200
            Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Moreno Bartalucci <moreno.bartalucci@tecnorama.it> - 2017-05-12 18:10 +0200
            Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Tony Lindgren <tony@atomide.com> - 2017-05-12 19:30 +0200
              Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Bin Liu <b-liu@ti.com> - 2017-05-12 19:50 +0200
                Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Tony Lindgren <tony@atomide.com> - 2017-05-12 19:50 +0200
            Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Moreno Bartalucci <moreno.bartalucci@tecnorama.it> - 2017-05-15 09:10 +0200
              Re: [PATCH] usb-musb: keep VBUS on when device is disconnected Bin Liu <b-liu@ti.com> - 2017-05-15 14:30 +0200

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