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From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] usb: ehci-omap: Don't softreset USB High-speed Host (UHH) Module
Date: Mon, 22 Jul 2013 10:52:04 +0200	[thread overview]
Message-ID: <201307221052.04316.marex@denx.de> (raw)
In-Reply-To: <1374480877-20643-1-git-send-email-rogerq@ti.com>

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

  parent reply	other threads:[~2013-07-22  8:52 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 [this message]
2013-07-23 18:53   ` Dan Murphy
2013-07-24  3:36 ` Marek Vasut

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