linux-kernel - [PATCH v3 1/7] usb: mtu3: give back request when rx error happens

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Date:   Mon, 17 Apr 2023 10:51:57 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Tianping Fang <tianping.fang@...iatek.com>
Subject: [PATCH v3 1/7] usb: mtu3: give back request when rx error happens

When the Rx enconnter errors, currently, only print error logs, that
may cause class driver's RX halt, shall give back the request with
error status meanwhile.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v3: no changes
v2: remove @req suggested by AngeloGioacchino
---
 drivers/usb/mtu3/mtu3_qmu.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/mtu3/mtu3_qmu.c b/drivers/usb/mtu3/mtu3_qmu.c
index a2fdab8b63b2..a4da1af0b2c0 100644
--- a/drivers/usb/mtu3/mtu3_qmu.c
+++ b/drivers/usb/mtu3/mtu3_qmu.c
@@ -466,6 +466,37 @@ static void qmu_tx_zlp_error_handler(struct mtu3 *mtu, u8 epnum)
 	mtu3_qmu_resume(mep);
 }
 
+/*
+ * when rx error happens (except zlperr), QMU will stop, and RQCPR saves
+ * the GPD encountered error, Done irq will arise after resuming QMU again.
+ */
+static void qmu_error_rx(struct mtu3 *mtu, u8 epnum)
+{
+	struct mtu3_ep *mep = mtu->out_eps + epnum;
+	struct mtu3_gpd_ring *ring = &mep->gpd_ring;
+	struct qmu_gpd *gpd_current = NULL;
+	struct mtu3_request *mreq;
+	dma_addr_t cur_gpd_dma;
+
+	cur_gpd_dma = read_rxq_cur_addr(mtu->mac_base, epnum);
+	gpd_current = gpd_dma_to_virt(ring, cur_gpd_dma);
+
+	mreq = next_request(mep);
+	if (!mreq || mreq->gpd != gpd_current) {
+		dev_err(mtu->dev, "no correct RX req is found\n");
+		return;
+	}
+
+	mreq->request.status = -EAGAIN;
+
+	/* by pass the current GDP */
+	gpd_current->dw0_info |= cpu_to_le32(GPD_FLAGS_BPS | GPD_FLAGS_HWO);
+	mtu3_qmu_resume(mep);
+
+	dev_dbg(mtu->dev, "%s EP%d, current=%p, req=%p\n",
+		__func__, epnum, gpd_current, mreq);
+}
+
 /*
  * NOTE: request list maybe is already empty as following case:
  * queue_tx --> qmu_interrupt(clear interrupt pending, schedule tasklet)-->
@@ -571,14 +602,18 @@ static void qmu_exception_isr(struct mtu3 *mtu, u32 qmu_status)
 
 	if ((qmu_status & RXQ_CSERR_INT) || (qmu_status & RXQ_LENERR_INT)) {
 		errval = mtu3_readl(mbase, U3D_RQERRIR0);
+		mtu3_writel(mbase, U3D_RQERRIR0, errval);
+
 		for (i = 1; i < mtu->num_eps; i++) {
 			if (errval & QMU_RX_CS_ERR(i))
 				dev_err(mtu->dev, "Rx %d CS error!\n", i);
 
 			if (errval & QMU_RX_LEN_ERR(i))
 				dev_err(mtu->dev, "RX %d Length error\n", i);
+
+			if (errval & (QMU_RX_CS_ERR(i) | QMU_RX_LEN_ERR(i)))
+				qmu_error_rx(mtu, i);
 		}
-		mtu3_writel(mbase, U3D_RQERRIR0, errval);
 	}
 
 	if (qmu_status & RXQ_ZLPERR_INT) {
-- 
2.18.0