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usb: dwc2: gadget: Fix sending zero length packet in DDMA mode.

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commit d53dc38857 upstream.

Sending zero length packet in DDMA mode perform by DMA descriptor
by setting SP (short packet) flag.

For DDMA in function dwc2_hsotg_complete_in() does not need to send
zlp.

Tested by USBCV MSC tests.

Fixes: f71b5e2533 ("usb: dwc2: gadget: fix zero length packet transfers")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/967bad78c55dd2db1c19714eee3d0a17cf99d74a.1626777738.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Minas Harutyunyan 2021-07-20 05:41:24 -07:00 • committed by Greg Kroah-Hartman
commit a206167bd6
1 changed files with 6 additions and 4 deletions
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10
drivers/usb/dwc2/gadget.c
View file

@ -2749,12 +2749,14 @@ static void dwc2_hsotg_complete_in(struct dwc2_hsotg *hsotg,
return;
}
/* Zlp for all endpoints, for ep0 only in DATA IN stage */
/* Zlp for all endpoints in non DDMA, for ep0 only in DATA IN stage */
if (hs_ep->send_zlp) {
dwc2_hsotg_program_zlp(hsotg, hs_ep);
hs_ep->send_zlp = 0;
/* transfer will be completed on next complete interrupt */
return;
if (!using_desc_dma(hsotg)) {
dwc2_hsotg_program_zlp(hsotg, hs_ep);
/* transfer will be completed on next complete interrupt */
return;
}
}
if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_DATA_IN) {