linux-kernel - [PATCH 5.15 079/107] usb: cdns3: fix issue with rearming ISO OUT endpoint

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Message-Id: <20220906132825.147504558@linuxfoundation.org>
Date:   Tue,  6 Sep 2022 15:31:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>
Subject: [PATCH 5.15 079/107] usb: cdns3: fix issue with rearming ISO OUT endpoint

From: Pawel Laszczak <pawell@...ence.com>

commit b46a6b09fa056042a302b181a1941f0056944603 upstream.

ISO OUT endpoint is enabled during queuing first usb request
in transfer ring and disabled when TRBERR is reported by controller.
After TRBERR and before next transfer added to TR driver must again
reenable endpoint but does not.
To solve this issue during processing TRBERR event driver must
set the flag EP_UPDATE_EP_TRBADDR in priv_ep->flags field.

Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
cc: <stable@...r.kernel.org>
Acked-by: Peter Chen <peter.chen@...nel.org>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Link: https://lore.kernel.org/r/20220825062137.5766-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/cdns3/cdns3-gadget.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -1690,6 +1690,7 @@ static int cdns3_check_ep_interrupt_proc
 				ep_cfg &= ~EP_CFG_ENABLE;
 				writel(ep_cfg, &priv_dev->regs->ep_cfg);
 				priv_ep->flags &= ~EP_QUIRK_ISO_OUT_EN;
+				priv_ep->flags |= EP_UPDATE_EP_TRBADDR;
 			}
 			cdns3_transfer_completed(priv_dev, priv_ep);
 		} else if (!(priv_ep->flags & EP_STALLED) &&