usb: cdnsp: fix lack of ZLP for ep0

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commit ae423ef5d0 upstream.

Patch implements the handling of ZLP for control transfer.
To send the ZLP driver must prepare the extra TRB in TD with
length set to zero and TRB type to TRB_NORMAL.
The first TRB must have set TRB_CHAIN flag, TD_SIZE = 1
and TRB type to TRB_DATA.

Fixes: 3d82904559 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
cc: <stable@vger.kernel.org>
Reviewed-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Link: https://lore.kernel.org/r/20221122085138.332434-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Pawel Laszczak 2022-11-22 03:51:38 -05:00 • committed by Greg Kroah-Hartman

parent 5b7c306106

commit dfbbc47d86

1 changed files with 32 additions and 10 deletions

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drivers/usb/cdns3/cdnsp-ring.c

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