All of lore.kernel.org
 help / color / mirror / Atom feed
From: Lan Tianyu <tianyu.lan@intel.com>
To: Sarah Sharp <sarah.a.sharp@linux.intel.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Alan Stern <stern@rowland.harvard.edu>
Cc: 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: Tue, 15 May 2012 22:31:38 +0800	[thread overview]
Message-ID: <4FB268CA.9060304@intel.com> (raw)
In-Reply-To: <20120514232123.GK18754@xanatos>

Since alan suggested we should start simpler version(power
down port that have no devices attached) firstly. And we
also should provide general power off mechanism.

I have a proposal.
first:  add portx_power_control sys file.
      echo "auto" => portx_power_control
                     check whether there is a device. if no, send the clear
                     USB_PORT_FEAT_POWER request. (since general way
                     to control port power is via set or clear PORT_POWER)

     echo "on" =>  portx_power_control
                     send the set  USB_PORT_FEAT_POWER request.

second:
In the  xhci driver, add acpi hook in the xhci_hub_control()
                 where USB_PORT_FEAT_POWER request is dealt with.

  reply	other threads:[~2012-05-15 14:31 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 [this message]
     [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
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4FB268CA.9060304@intel.com \
    --to=tianyu.lan@intel.com \
    --cc=dcbw@redhat.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=sarah.a.sharp@linux.intel.com \
    --cc=stern@rowland.harvard.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.