From: Roger Quadros <rogerq@ti.com>
To: <balbi@ti.com>
Cc: Alan Stern <stern@rowland.harvard.edu>, <tony@atomide.com>,
<ruslan.bilovol@ti.com>, <linux-usb@vger.kernel.org>,
<linux-omap@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH 4/6] USB: ehci-omap: Suspend the controller during bus suspend
Date: Wed, 3 Jul 2013 16:06:04 +0300 [thread overview]
Message-ID: <51D421BC.9050600@ti.com> (raw)
In-Reply-To: <20130703125719.GD15056@arwen.pp.htv.fi>
On 07/03/2013 03:57 PM, Felipe Balbi wrote:
> Hi,
>
> On Tue, Jul 02, 2013 at 01:17:58PM -0400, Alan Stern wrote:
>> A PCI-based EHCI controller has two power sources: the core well (which
>> is turned off during suspend) and the auxiliary well (which remains
>> powered). That's how remote wakeup works; it uses the auxiliary well.
>
> This, kinda, matches what OMAP tries to do with pad wakeup. Just that
> pad wakeup sits outside of the device itself. Perhaps we could look into
> how PCI handles the aux well and take some inspiration from there.
>
> Any pointers under drivers/pci/ would be great :-)
>
>From what I understood, auxiliary well is just a power source, and it keeps
the EHCI controller powered even during suspend.
If that is true then it is different from our situation as we power down the
EHCI controller completely.
cheers,
-roger
next prev parent reply other threads:[~2013-07-03 13:06 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-19 14:05 [RFC PATCH 0/6] Suspend USB Host controller on bus suspend Roger Quadros
2013-06-19 14:05 ` [RFC PATCH 1/6] mfd: omap-usb-host: move initialization to module_init() Roger Quadros
2013-06-20 12:07 ` Felipe Balbi
2013-06-20 12:29 ` Roger Quadros
2013-06-19 14:05 ` [RFC PATCH 2/6] mfd: omap-usb-host: Put pins in IDLE state on suspend Roger Quadros
2013-06-19 17:23 ` Kevin Hilman
2013-06-20 7:21 ` Tony Lindgren
2013-06-20 12:30 ` Roger Quadros
2013-06-19 14:05 ` [RFC PATCH 3/6] USB: ehci: allow controller drivers to override irq & bus_suspend/resume Roger Quadros
2013-06-19 14:05 ` [RFC PATCH 4/6] USB: ehci-omap: Suspend the controller during bus suspend Roger Quadros
2013-06-19 17:39 ` Kevin Hilman
2013-06-20 12:32 ` Roger Quadros
2013-06-20 12:11 ` Felipe Balbi
2013-06-20 12:35 ` Roger Quadros
2013-06-20 17:33 ` Alan Stern
2013-06-24 15:09 ` Roger Quadros
2013-06-24 19:34 ` Alan Stern
2013-06-25 13:59 ` Roger Quadros
2013-06-25 17:38 ` Alan Stern
2013-06-26 13:38 ` Roger Quadros
2013-06-27 15:40 ` Alan Stern
2013-06-28 12:20 ` Roger Quadros
2013-06-28 13:57 ` Roger Quadros
2013-06-28 19:18 ` Alan Stern
2013-07-01 8:33 ` Roger Quadros
2013-06-28 19:06 ` Alan Stern
2013-07-01 8:16 ` Roger Quadros
2013-07-01 16:24 ` Alan Stern
2013-07-01 16:49 ` Felipe Balbi
2013-07-01 21:01 ` Alan Stern
2013-07-02 8:22 ` Roger Quadros
2013-07-02 17:17 ` Alan Stern
2013-07-03 9:13 ` Roger Quadros
2013-07-03 12:57 ` Felipe Balbi
2013-07-03 13:06 ` Roger Quadros [this message]
2013-07-03 13:15 ` Felipe Balbi
2013-07-03 14:30 ` Alan Stern
2013-07-09 13:58 ` Roger Quadros
2013-06-19 14:05 ` [RFC PATCH 5/6] ARM: dts: omap3beagle-xm: Add idle state pins for USB host Roger Quadros
2013-06-19 18:42 ` Kevin Hilman
2013-06-20 11:55 ` Roger Quadros
2013-06-20 12:02 ` Roger Quadros
2013-06-20 13:02 ` Roger Quadros
2013-06-19 14:05 ` [RFC PATCH 6/6] ARM: OMAP3: Enable Hardware Save and Restore for USB Host Roger Quadros
2013-06-19 17:30 ` Sergei Shtylyov
2013-06-20 12:42 ` Roger Quadros
2013-06-19 15:23 ` [RFC PATCH 0/6] Suspend USB Host controller on bus suspend Alan Stern
2013-06-20 12:39 ` Roger Quadros
2013-06-20 17:19 ` Alan Stern
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