RE: [RFC] [PATCH] usb: gadget: fix dtd dma confusion

=20

quoted

after a while of testing and searching I can come up with a patch
that fixes g_ether <-> iperf for fsl_udc on ARM i.MX35.

The sad part is that this kind of fix is already implemented for
marvell mv_udc driver since last year but still _not_ in the ~15
other *udc.c drivers.

=20
It is a controller limitation (bug?) for chipidea controller when using
dtd list to handle multi-dtds situation. The controller will read dtd's
next pointer after this dtd's active bit has already been cleared.

Freescale has an errata for this problem's description and solution.
http://cache.freescale.com/files/dsp/doc/errata/IMX23CE.pdf
See 2858

BR,
Peter