From: Dan Murphy <dmurphy@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] usb: ehci-omap: Don't softreset USB High-speed Host (UHH) Module
Date: Tue, 23 Jul 2013 13:53:25 -0500 [thread overview]
Message-ID: <51EED125.8050907@ti.com> (raw)
In-Reply-To: <201307221052.04316.marex@denx.de>
On 07/22/2013 03:52 AM, Marek Vasut wrote:
> Dear Roger Quadros,
>
>> Fixes NFS root problems with Beagle (3530 ES1.0) when used with
>> external USB-ethernet adapter and "USB start" command used within
>> u-boot.
>>
>> Soft resetting the UHH module causes instability issues on
>> all OMAPs so we just avoid it.
>>
>> See OMAP36xx Errata
>> i571: USB host EHCI may stall when entering smart-standby mode
>> i660: USBHOST Configured In Smart-Idle Can Lead To a Deadlock
>>
>> On OMAP4/5, soft-resetting the UHH module can put it into
>> Smart-Idle mode and lead to a deadlock.
>>
>> On OMAP3 this doesn't seem to be the case but still instabilities
>> are observed on beagle (3530 ES1.0) if soft-reset is used.
>> e.g. NFS root failures with Linux kernel.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Acked-by: Marek Vasut <marex@denx.de>
>
> Now it all depends on Tom, but this would be a last-second save ;-)
>
> Best regards,
> Marek Vasut
Tested-by: Dan Murphy <dmurphy@ti.com>
--
------------------
Dan Murphy
next prev parent reply other threads:[~2013-07-23 18:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-22 8:14 [U-Boot] [PATCH] usb: ehci-omap: Don't softreset USB High-speed Host (UHH) Module Roger Quadros
2013-07-22 8:46 ` Stefan Roese
2013-07-22 8:52 ` Marek Vasut
2013-07-23 18:53 ` Dan Murphy [this message]
2013-07-24 3:36 ` Marek Vasut
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