linux-kernel - [PATCH 5.4 04/56] usb: cdns3: fix race condition before setting doorbell

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Message-Id: <20211004125030.153725747@linuxfoundation.org>
Date:   Mon,  4 Oct 2021 14:52:24 +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, Aswath Govindraju <a-govindraju@...com>,
        Pawel Laszczak <pawell@...ence.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 04/56] usb: cdns3: fix race condition before setting doorbell

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

commit b69ec50b3e55c4b2a85c8bc46763eaf33060584 upstream

For DEV_VER_V3 version there exist race condition between clearing
ep_sts.EP_STS_TRBERR and setting ep_cmd.EP_CMD_DRDY bit.
Setting EP_CMD_DRDY will be ignored by controller when
EP_STS_TRBERR is set. So, between these two instructions we have
a small time gap in which the EP_STS_TRBERR can be set. In such case
the transfer will not start after setting doorbell.

Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
cc: <stable@...r.kernel.org> # 5.4.x
Tested-by: Aswath Govindraju <a-govindraju@...com>
Reviewed-by: Aswath Govindraju <a-govindraju@...com>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/cdns3/gadget.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index c3bf54cc530f..296f2ee1b680 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -807,6 +807,19 @@ static void cdns3_wa1_tray_restore_cycle_bit(struct cdns3_device *priv_dev,
 		cdns3_wa1_restore_cycle_bit(priv_ep);
 }
 
+static void cdns3_rearm_drdy_if_needed(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	if (priv_dev->dev_ver < DEV_VER_V3)
+		return;
+
+	if (readl(&priv_dev->regs->ep_sts) & EP_STS_TRBERR) {
+		writel(EP_STS_TRBERR, &priv_dev->regs->ep_sts);
+		writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+	}
+}
+
 /**
  * cdns3_ep_run_transfer - start transfer on no-default endpoint hardware
  * @priv_ep: endpoint object
@@ -1003,6 +1016,7 @@ int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 		/*clearing TRBERR and EP_STS_DESCMIS before seting DRDY*/
 		writel(EP_STS_TRBERR | EP_STS_DESCMIS, &priv_dev->regs->ep_sts);
 		writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+		cdns3_rearm_drdy_if_needed(priv_ep);
 		trace_cdns3_doorbell_epx(priv_ep->name,
 					 readl(&priv_dev->regs->ep_traddr));
 	}
-- 
2.33.0