Merge tag 'linux-can-next-for-6.3-20230217' of...

Merge tag 'linux-can-next-for-6.3-20230217' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next
Marc Kleine-Budde says:

====================
pull-request: can-next 2023-02-17 - fixed

this is a pull request of 4 patches for net-next/master.

The first patch is by Yang Li and converts the ctucanfd driver to
devm_platform_ioremap_resource().

The last 3 patches are by Frank Jungclaus, target the esd_usb driver
and contains preparations for the upcoming support of the esd
CAN-USB/3 hardware.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/ctucanfd/ctucanfd_platform.c

@@ -47,7 +47,6 @@ static void ctucan_platform_set_drvdata(struct device *dev,
  */
 static int ctucan_platform_probe(struct platform_device *pdev)
 {
-	struct resource *res; /* IO mem resources */
 	struct device	*dev = &pdev->dev;
 	void __iomem *addr;
 	int ret;
@@ -55,8 +54,7 @@ static int ctucan_platform_probe(struct platform_device *pdev)
 	int irq;
 
 	/* Get the virtual base address for the device */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	addr = devm_ioremap_resource(dev, res);
+	addr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(addr)) {
 		ret = PTR_ERR(addr);
 		goto err;

drivers/net/can/usb/esd_usb.c

@@ -127,7 +127,15 @@ struct rx_msg {
 	u8 dlc;
 	__le32 ts;
 	__le32 id; /* upper 3 bits contain flags */
-	u8 data[8];
+	union {
+		u8 data[8];
+		struct {
+			u8 status; /* CAN Controller Status */
+			u8 ecc;    /* Error Capture Register */
+			u8 rec;    /* RX Error Counter */
+			u8 tec;    /* TX Error Counter */
+		} ev_can_err_ext;  /* For ESD_EV_CAN_ERROR_EXT */
+	};
 };
 
 struct tx_msg {
@@ -229,51 +237,52 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
 	u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
 
 	if (id == ESD_EV_CAN_ERROR_EXT) {
-		u8 state = msg->msg.rx.data[0];
-		u8 ecc = msg->msg.rx.data[1];
-		u8 rxerr = msg->msg.rx.data[2];
-		u8 txerr = msg->msg.rx.data[3];
+		u8 state = msg->msg.rx.ev_can_err_ext.status;
+		u8 ecc = msg->msg.rx.ev_can_err_ext.ecc;
+		u8 rxerr = msg->msg.rx.ev_can_err_ext.rec;
+		u8 txerr = msg->msg.rx.ev_can_err_ext.tec;
 
 		netdev_dbg(priv->netdev,
 			   "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n",
 			   msg->msg.rx.dlc, state, ecc, rxerr, txerr);
 
 		skb = alloc_can_err_skb(priv->netdev, &cf);
-		if (skb == NULL) {
-			stats->rx_dropped++;
-			return;
-		}
 
 		if (state != priv->old_state) {
+			enum can_state tx_state, rx_state;
+			enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
+
 			priv->old_state = state;
 
 			switch (state & ESD_BUSSTATE_MASK) {
 			case ESD_BUSSTATE_BUSOFF:
-				priv->can.state = CAN_STATE_BUS_OFF;
-				cf->can_id |= CAN_ERR_BUSOFF;
-				priv->can.can_stats.bus_off++;
+				new_state = CAN_STATE_BUS_OFF;
 				can_bus_off(priv->netdev);
 				break;
 			case ESD_BUSSTATE_WARN:
-				priv->can.state = CAN_STATE_ERROR_WARNING;
-				priv->can.can_stats.error_warning++;
+				new_state = CAN_STATE_ERROR_WARNING;
 				break;
 			case ESD_BUSSTATE_ERRPASSIVE:
-				priv->can.state = CAN_STATE_ERROR_PASSIVE;
-				priv->can.can_stats.error_passive++;
+				new_state = CAN_STATE_ERROR_PASSIVE;
 				break;
 			default:
-				priv->can.state = CAN_STATE_ERROR_ACTIVE;
+				new_state = CAN_STATE_ERROR_ACTIVE;
 				txerr = 0;
 				rxerr = 0;
 				break;
 			}
-		} else {
+
+			if (new_state != priv->can.state) {
+				tx_state = (txerr >= rxerr) ? new_state : 0;
+				rx_state = (txerr <= rxerr) ? new_state : 0;
+				can_change_state(priv->netdev, cf,
+						 tx_state, rx_state);
+			}
+		} else if (skb) {
 			priv->can.can_stats.bus_error++;
 			stats->rx_errors++;
 
-			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR |
-				      CAN_ERR_CNT;
+			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 
 			switch (ecc & SJA1000_ECC_MASK) {
 			case SJA1000_ECC_BIT:
@@ -286,7 +295,6 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
 				cf->data[2] |= CAN_ERR_PROT_STUFF;
 				break;
 			default:
-				cf->data[3] = ecc & SJA1000_ECC_SEG;
 				break;
 			}
 
@@ -294,20 +302,22 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
 			if (!(ecc & SJA1000_ECC_DIR))
 				cf->data[2] |= CAN_ERR_PROT_TX;
 
-			if (priv->can.state == CAN_STATE_ERROR_WARNING ||
-			    priv->can.state == CAN_STATE_ERROR_PASSIVE) {
-				cf->data[1] = (txerr > rxerr) ?
-					CAN_ERR_CRTL_TX_PASSIVE :
-					CAN_ERR_CRTL_RX_PASSIVE;
-			}
-			cf->data[6] = txerr;
-			cf->data[7] = rxerr;
+			/* Bit stream position in CAN frame as the error was detected */
+			cf->data[3] = ecc & SJA1000_ECC_SEG;
 		}
 
 		priv->bec.txerr = txerr;
 		priv->bec.rxerr = rxerr;
 
-		netif_rx(skb);
+		if (skb) {
+			cf->can_id |= CAN_ERR_CNT;
+			cf->data[6] = txerr;
+			cf->data[7] = rxerr;
+
+			netif_rx(skb);
+		} else {
+			stats->rx_dropped++;
+		}
 	}
 }