From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marex@denx.de>
Date: Tue, 5 Jan 2016 15:36:10 +0100
Subject: [U-Boot] [PATCH] usb: dwc2: Enhance interrupt handling for
	CONTROL transaction
In-Reply-To: <1451970004-2344-1-git-send-email-clsee@altera.com>
References: <1451970004-2344-1-git-send-email-clsee@altera.com>
Message-ID: <201601051536.11086.marex@denx.de>
List-Id: <u-boot.lists.denx.de>
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To: u-boot@lists.denx.de

On Tuesday, January 05, 2016 at 06:00:04 AM, Chin Liang See wrote:
> Per DesignWare USB OTG databook, driver should retry up to
> 3 times when transaction error (hcint.xacterr) happen. But
> the 3 times doesn't count when the response is nack
> (hcint.nak) or frame overrun (hcint.frmoverun)
> 
> This patch solved the enumeration error as spotted at socfpga
> cyclone5_socdk when plugging in certain pendrive.
> 
> Signed-off-by: Chin Liang See <clsee@altera.com>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
> Cc: Dinh Nguyen <dinh.linux@gmail.com>
> Cc: Pavel Machek <pavel@denx.de>
> Cc: Oleksandr Tymoshenko <gonzo@bluezbox.com>
> Cc: Stephen Warren <swarren@wwwdotorg.org>
> Cc: Alexander Stein <alexanders83@web.de>
> Cc: Peter Griffin <peter.griffin@linaro.org>

I applied this change on top of u-boot-socfpga/master and tested it on
SoCFPGA CycloneV SoCDK with "Sandisk cruzer force" stick. The board gets 
completely stuck if I have dcache ENABLED and perform 'usb reset'. This
patch is:

Naked-by: Marek Vasut <marex@denx.de>

Sorry :-(

Best regards,
Marek Vasut