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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

  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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