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

[Chin Liang See <clsee@altera.com>]

On Wed, 2016-01-13 at 16:22 +0100, Marek Vasut wrote:
> On Wednesday, January 13, 2016 at 04:18:43 PM, Chin Liang See wrote:
> > On Wed, 2016-01-13 at 03:58 +0100, Marek Vasut wrote:
> > > On Tuesday, January 05, 2016 at 05:16:05 PM, Marek Vasut wrote:
> > > > On Tuesday, January 05, 2016 at 04:51:47 PM, Chin Liang See
> > > > wrote:
> > > > > On Tue, 2016-01-05 at 15:36 +0100, Marek Vasut wrote:
> > > > > > 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:
> > > > > Thanks Marek for testing. I managed to find a SanDisk Cruzer
> > > > > Blade and
> > > > > notice the same fail behaviours as yours. FYI, note that this
> > > > > patch
> > > > > works well with other 3 pendrive that I have.
> > > > > 
> > > > > With SanDisk, the dwc2 driver was timed out as hcint.xfercomp
> > > > > and
> > > > > chhltd never get set even after 1s. It keep retrying
> > > > > endlessly
> > > > > due to
> > > > > miss handling for the ETIMEDOUT within this patch.
> > > > > 
> > > > > In short, the retry doesn't work for SanDisk but the dcache
> > > > > disable
> > > > > works. Need to figure out more what cause the failure.
> > > > 
> > > > Excellent, I have one of those too (I bought the entire lineup
> > > > of
> > > > these
> > > > sandisk sticks at one point ;-) )
> > > 
> > > Hi, any news on the SoCFPGA USB/QSPI problem investigation?
> > > Thanks!
> > 
> > I am still troubleshooting it. I played with few configuration
> > within
> > L3 but not helping. This including avoiding multiple outstanding
> > transaction and security (allow both secure and non secure).
> 
> Yeah
> 
> > But all these issue will gone once dcache is off. I believe need to
> > visit the MMU table.
> 
> I was there already ;-) But given enough eyeballs, are bugs are
> shallow.

Continue some troubleshooting today. Notice some behavior change where
the SanDisk Cruzer Blade failed after POR and dcache disable. 

After enabling the debug message, the hub is complaining over current
(port change = 0x9) on the port where pen drive is plugged in. The port
status = 0x10 indicate no device present.

Appreciate any quick advise while digging more the hub spec.

Thanks
Chin Liang

> 
> Best regards,