From: Felipe Balbi <balbi@ti.com>
To: Pavankumar Kondeti <pkondeti@codeaurora.org>
Cc: linux-usb@vger.kernel.org, linux-arm-msm@vger.kernel.org
Subject: Re: [RFC 5/5] USB: Eliminate delays involved in root hub initialization during HNP
Date: Wed, 15 Dec 2010 14:21:56 +0200 [thread overview]
Message-ID: <20101215122156.GR2997@legolas.emea.dhcp.ti.com> (raw)
In-Reply-To: <1292411654-21382-6-git-send-email-pkondeti@codeaurora.org>
On Wed, Dec 15, 2010 at 04:44:14PM +0530, Pavankumar Kondeti wrote:
>Some USB controllers have common resources (IRQ, register address
>space) for Host, Peripheral and OTG. So HCD is added only before
>entering into Host mode. Root hub initialization is done in
>different steps to decrease boot up time. But this makes B-device
>difficult to meet HNP timings. Hence eliminate delays involved in
>root hub initialization for B-host.
I wonder if this is the best approach. Would it be easier to not touch
usbcore, probe the entire stack during boot but have a "core" layer
handling synchronization to shared resources ?
Maybe you could make your device an MFD device that allocates
platform_devices for its children (HCI, UDC, OTG, etc) and pass in a
bunch of read/write functions as platform_data for them to use as
accessors to shared register space ?!? Would that work ?
>This patch also marks hnp_supported flag TURE for B-host while
s/TURE/TRUE
--
balbi
next prev parent reply other threads:[~2010-12-15 12:22 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-15 11:14 [RFC 0/5] USB core changes for supporting OTG on MSM SoC Pavankumar Kondeti
2010-12-15 11:14 ` [RFC 1/5] USB: core: Add input prompt and help text for USB_OTG config Pavankumar Kondeti
2010-12-15 12:35 ` Sergei Shtylyov
2010-12-15 21:52 ` Greg KH
2010-12-16 8:53 ` Pavan Kondeti
2010-12-15 11:14 ` [RFC 2/5] USB: core: OTG Supplement Revision 2.0 updates Pavankumar Kondeti
2010-12-15 12:16 ` Felipe Balbi
2010-12-15 21:39 ` Alan Stern
2010-12-16 8:10 ` Felipe Balbi
2010-12-16 8:54 ` Pavan Kondeti
2010-12-16 9:11 ` Felipe Balbi
2010-12-15 21:29 ` Alan Stern
2010-12-16 8:54 ` Pavan Kondeti
2010-12-15 21:53 ` Greg KH
2010-12-16 8:54 ` Pavan Kondeti
2010-12-15 11:14 ` [RFC 3/5] USB: gadget: OTG supplement revision " Pavankumar Kondeti
2010-12-15 12:18 ` Felipe Balbi
2010-12-16 8:54 ` Pavan Kondeti
2010-12-15 11:14 ` [RFC 4/5] USB: EHCI: Notify HCD about HNP enabled port suspend Pavankumar Kondeti
2010-12-15 12:19 ` Felipe Balbi
2010-12-16 8:54 ` Pavan Kondeti
2010-12-15 11:14 ` [RFC 5/5] USB: Eliminate delays involved in root hub initialization during HNP Pavankumar Kondeti
2010-12-15 12:21 ` Felipe Balbi [this message]
2010-12-16 11:26 ` Pavan Kondeti
2010-12-16 12:15 ` Felipe Balbi
2010-12-16 12:53 ` Pavan Kondeti
2010-12-15 21:52 ` Greg KH
2010-12-15 21:38 ` [RFC 0/5] USB core changes for supporting OTG on MSM SoC Alan Stern
2010-12-16 8:55 ` Pavan Kondeti
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