From: Greg KH <gregkh@linuxfoundation.org>
To: Lan Tianyu <tianyu.lan@intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
Sarah Sharp <sarah.a.sharp@linux.intel.com>,
Dan Williams <dcbw@redhat.com>,
lenb@kernel.org, linux-acpi@vger.kernel.org,
linux-usb@vger.kernel.org
Subject: Re: [RFC PATCH] usb/acpi: Add support usb port power off mechanism for device fixed on the motherboard
Date: Wed, 16 May 2012 08:08:46 -0700 [thread overview]
Message-ID: <20120516150846.GB3293@kroah.com> (raw)
In-Reply-To: <4FB3BF95.50600@intel.com>
On Wed, May 16, 2012 at 10:54:13PM +0800, Lan Tianyu wrote:
> On 2012/5/16 22:39, Greg KH wrote:
> >On Wed, May 16, 2012 at 10:36:02AM -0400, Alan Stern wrote:
> >>On Wed, 16 May 2012, Lan Tianyu wrote:
> >>
> >>>Ok. Let me reconfirm the meaning of these opinions.
> >>>
> >>>"auto"
> >>> if port without device, turn off power directly.
> >>> if port with device, turn off power when the device is suspended.
> >>>
> >>>"on" the port's power must be on.
> >>>
> >>>"off" the port's power must be off.
> >>>
> >>>Right?
> >>Maybe the "auto" setting should be renamed "active". Then "auto" can
> >>be used for:
> >>
> >> If the port has a device, turn the power on.
> >> If the port doesn't have a device, turn the power off.
> >And plugging a new device into a port that was powered off is going to
> >cause the power to come back on, right?
> When the port was powered off, the connect-change event will not be
> detected and
> we don't know a device was plugged in. :(
Then that doesn't seem like a very good thing to ever do, right?
greg k-h
next prev parent reply other threads:[~2012-05-16 15:08 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 8:33 [RFC PATCH] usb/acpi: Add support usb port power off mechanism for device fixed on the motherboard Lan Tianyu
2012-05-10 15:54 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1205101136470.1831-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-05-10 16:35 ` Sarah Sharp
2012-05-10 17:44 ` Alan Stern
2012-05-11 16:12 ` Lan Tianyu
2012-05-11 16:16 ` Lan Tianyu
2012-05-11 17:44 ` Alan Stern
2012-05-11 18:12 ` Sarah Sharp
2012-05-12 12:47 ` Sergei Shtylyov
2012-05-12 14:04 ` Greg KH
2012-05-12 18:00 ` Lan Tianyu
2012-05-11 18:18 ` Lan Tianyu
[not found] ` <Pine.LNX.4.44L0.1205111302080.1865-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-05-11 18:35 ` Greg KH
2012-05-11 19:32 ` Alan Stern
2012-05-11 20:11 ` Sarah Sharp
2012-05-11 21:09 ` Peter Stuge
2012-05-15 1:47 ` Sarah Sharp
2012-05-15 4:57 ` Peter Stuge
2012-05-11 19:54 ` Lan, Tianyu
2012-05-11 20:15 ` Sarah Sharp
2012-05-11 20:26 ` Alan Stern
2012-05-11 20:20 ` Alan Stern
2012-05-12 17:47 ` Lan Tianyu
2012-05-12 18:04 ` Lan Tianyu
2012-05-13 2:50 ` Alan Stern
2012-05-10 19:19 ` Dan Williams
[not found] ` <1336677578.6463.5.camel-wKZy7rqYPVb5EHUCmHmTqw@public.gmane.org>
2012-05-10 21:11 ` Sarah Sharp
2012-05-11 4:13 ` Peter Stuge
2012-05-11 14:20 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1205111019000.1865-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-05-11 14:30 ` Peter Stuge
2012-05-11 14:08 ` Alan Stern
2012-05-11 18:03 ` Sarah Sharp
2012-05-11 19:14 ` Alan Stern
2012-05-11 20:21 ` Sarah Sharp
2012-05-11 20:36 ` Alan Stern
2012-05-11 23:59 ` Sarah Sharp
2012-05-12 0:17 ` Greg KH
2012-05-12 13:54 ` Alan Stern
2012-05-14 23:21 ` Sarah Sharp
2012-05-15 14:31 ` Lan Tianyu
[not found] ` <4FB268CA.9060304-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2012-05-15 15:18 ` Greg KH
2012-05-15 20:00 ` Sarah Sharp
2012-05-16 6:26 ` Lan Tianyu
2012-05-16 14:36 ` Alan Stern
2012-05-16 14:39 ` Greg KH
2012-05-16 14:54 ` Lan Tianyu
2012-05-16 15:08 ` Greg KH [this message]
2012-05-16 15:32 ` Lan Tianyu
[not found] ` <20120516150846.GB3293-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2012-05-16 15:57 ` Sarah Sharp
2012-05-16 15:12 ` Alan Stern
[not found] ` <20120516143958.GA612-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2012-05-17 11:42 ` Sergei Shtylyov
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