[U-Boot] [PATCH] usb: dwc2: Enhance interrupt handling for CONTROL transaction

[Marek Vasut]

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 at altera.com>
> Cc: Marek Vasut <marex at denx.de>
> Cc: Dinh Nguyen <dinguyen at opensource.altera.com>
> Cc: Dinh Nguyen <dinh.linux at gmail.com>
> Cc: Pavel Machek <pavel at denx.de>
> Cc: Oleksandr Tymoshenko <gonzo at bluezbox.com>
> Cc: Stephen Warren <swarren at wwwdotorg.org>
> Cc: Alexander Stein <alexanders83 at web.de>
> Cc: Peter Griffin <peter.griffin at 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 at denx.de>

Sorry :-(

Best regards,
Marek Vasut