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