usb: dwc2: gadget: fix zero length packet transfers
According to programming guide, zero length packet should be programmed on its own and should not be counted in DIEPTSIZ.PktCnt with other packets. For ep0, this is the zlp for DATA IN stage (if required) and not for the STATUS stage. Tested-by:Robert Baldyga <r.baldyga@samsung.com> Acked-by:
Paul Zimmerman <paulz@synopsys.com> Signed-off-by:
Gregory Herrero <gregory.herrero@intel.com> Signed-off-by:
Mian Yousaf Kaukab <yousaf.kaukab@intel.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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