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usb: dwc2: gadget: Fix ISOC transfer complete handling for DDMA 

When last descriptor in a descriptor list completed with XferComplete
interrupt, core switching to handle next descriptor and assert BNA
interrupt. Both these interrupts are set while dwc2_hsotg_epint()
handler called. Each interrupt should be handled separately: first
XferComplete interrupt then BNA interrupt, otherwise last completed
transfer will not be giveback to function driver as completed
request.

Fixes: 729cac693e ("usb: dwc2: Change ISOC DDMA flow")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/a36981accc26cd674c5d8f8da6164344b94ec1fe.1631386531.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Minas Harutyunyan 2021-09-11 22:58:30 +04:00 committed by Greg Kroah-Hartman
parent 5cf86349e9
commit dbe2518b2d
1 changed files with 1 additions and 3 deletions
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4
drivers/usb/dwc2/gadget.c
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@ -3067,9 +3067,7 @@ static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
/* In DDMA handle isochronous requests separately */
if (using_desc_dma(hsotg) && hs_ep->isochronous) {
/* XferCompl set along with BNA */
if (!(ints & DXEPINT_BNAINTR))
dwc2_gadget_complete_isoc_request_ddma(hs_ep);
dwc2_gadget_complete_isoc_request_ddma(hs_ep);
} else if (dir_in) {
/*
* We get OutDone from the FIFO, so we only