USB: gadget: imx_udc: don't queue more data when zlp is to be sent
authorDaniel Glöckner <dg@emlix.com>
Thu, 28 May 2009 11:00:14 +0000 (13:00 +0200)
committerGreg Kroah-Hartman <gregkh@suse.de>
Tue, 16 Jun 2009 04:44:46 +0000 (21:44 -0700)
commit680cc64557101eaaca706dc9a1a0777f35aac0da
tree9127ca038b29340185caff4621126ae83baf14f1
parent2e25134122c25ebb0679b4bbd536fb46c669f9d7
USB: gadget: imx_udc: don't queue more data when zlp is to be sent

When a zero-length packet has been requested and another packet is
written into the fifo, the MX1 tends to send the first byte of the
previous packet instead of the first byte of the current packet.
The CRC is adjusted accordingly so that this packet is _not_
discarded by the host.

Waiting for the ZLPS bit to clear avoids these bad packets.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Cc: Darius Augulis <augulis.darius@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/gadget/imx_udc.c