--- zzzz-none-000/linux-3.10.107/drivers/net/can/sja1000/sja1000.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/net/can/sja1000/sja1000.c	2021-02-04 17:41:59.000000000 +0000
@@ -106,8 +106,7 @@
 	struct sja1000_priv *priv = netdev_priv(dev);
 
 	if (priv->reg_base && sja1000_is_absent(priv)) {
-		printk(KERN_INFO "%s: probing @0x%lX failed\n",
-		       DRV_NAME, dev->base_addr);
+		netdev_err(dev, "probing failed\n");
 		return 0;
 	}
 	return -1;
@@ -142,6 +141,7 @@
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
 	unsigned char status = priv->read_reg(priv, SJA1000_MOD);
+	u8 mod_reg_val = 0x00;
 	int i;
 
 	for (i = 0; i < 100; i++) {
@@ -159,9 +159,10 @@
 
 		/* set chip to normal mode */
 		if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
-			priv->write_reg(priv, SJA1000_MOD, MOD_LOM);
-		else
-			priv->write_reg(priv, SJA1000_MOD, 0x00);
+			mod_reg_val |= MOD_LOM;
+		if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
+			mod_reg_val |= MOD_STM;
+		priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
 
 		udelay(10);
 
@@ -171,6 +172,35 @@
 	netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 }
 
+/*
+ * initialize SJA1000 chip:
+ *   - reset chip
+ *   - set output mode
+ *   - set baudrate
+ *   - enable interrupts
+ *   - start operating mode
+ */
+static void chipset_init(struct net_device *dev)
+{
+	struct sja1000_priv *priv = netdev_priv(dev);
+
+	/* set clock divider and output control register */
+	priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
+
+	/* set acceptance filter (accept all) */
+	priv->write_reg(priv, SJA1000_ACCC0, 0x00);
+	priv->write_reg(priv, SJA1000_ACCC1, 0x00);
+	priv->write_reg(priv, SJA1000_ACCC2, 0x00);
+	priv->write_reg(priv, SJA1000_ACCC3, 0x00);
+
+	priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
+	priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
+	priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
+	priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
+
+	priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
+}
+
 static void sja1000_start(struct net_device *dev)
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
@@ -179,6 +209,10 @@
 	if (priv->can.state != CAN_STATE_STOPPED)
 		set_reset_mode(dev);
 
+	/* Initialize chip if uninitialized at this stage */
+	if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
+		chipset_init(dev);
+
 	/* Clear error counters and error code capture */
 	priv->write_reg(priv, SJA1000_TXERR, 0x0);
 	priv->write_reg(priv, SJA1000_RXERR, 0x0);
@@ -187,9 +221,6 @@
 	/* clear interrupt flags */
 	priv->read_reg(priv, SJA1000_IR);
 
-	/* clear interrupt flags */
-	priv->read_reg(priv, SJA1000_IR);
-
 	/* leave reset mode */
 	set_normal_mode(dev);
 }
@@ -242,35 +273,6 @@
 }
 
 /*
- * initialize SJA1000 chip:
- *   - reset chip
- *   - set output mode
- *   - set baudrate
- *   - enable interrupts
- *   - start operating mode
- */
-static void chipset_init(struct net_device *dev)
-{
-	struct sja1000_priv *priv = netdev_priv(dev);
-
-	/* set clock divider and output control register */
-	priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
-
-	/* set acceptance filter (accept all) */
-	priv->write_reg(priv, SJA1000_ACCC0, 0x00);
-	priv->write_reg(priv, SJA1000_ACCC1, 0x00);
-	priv->write_reg(priv, SJA1000_ACCC2, 0x00);
-	priv->write_reg(priv, SJA1000_ACCC3, 0x00);
-
-	priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
-	priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
-	priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
-	priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
-
-	priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
-}
-
-/*
  * transmit a CAN message
  * message layout in the sk_buff should be like this:
  * xx xx xx xx	 ff	 ll   00 11 22 33 44 55 66 77
@@ -285,6 +287,7 @@
 	uint8_t dlc;
 	canid_t id;
 	uint8_t dreg;
+	u8 cmd_reg_val = 0x00;
 	int i;
 
 	if (can_dropped_invalid_skb(dev, skb))
@@ -319,9 +322,14 @@
 	can_put_echo_skb(skb, dev, 0);
 
 	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
-		sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
+		cmd_reg_val |= CMD_AT;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
+		cmd_reg_val |= CMD_SRR;
 	else
-		sja1000_write_cmdreg(priv, CMD_TR);
+		cmd_reg_val |= CMD_TR;
+
+	sja1000_write_cmdreg(priv, cmd_reg_val);
 
 	return NETDEV_TX_OK;
 }
@@ -372,10 +380,9 @@
 	/* release receive buffer */
 	sja1000_write_cmdreg(priv, CMD_RRB);
 
-	netif_rx(skb);
-
 	stats->rx_packets++;
 	stats->rx_bytes += cf->can_dlc;
+	netif_rx(skb);
 
 	can_led_event(dev, CAN_LED_EVENT_RX);
 }
@@ -387,12 +394,20 @@
 	struct can_frame *cf;
 	struct sk_buff *skb;
 	enum can_state state = priv->can.state;
+	enum can_state rx_state, tx_state;
+	unsigned int rxerr, txerr;
 	uint8_t ecc, alc;
 
 	skb = alloc_can_err_skb(dev, &cf);
 	if (skb == NULL)
 		return -ENOMEM;
 
+	txerr = priv->read_reg(priv, SJA1000_TXERR);
+	rxerr = priv->read_reg(priv, SJA1000_RXERR);
+
+	cf->data[6] = txerr;
+	cf->data[7] = rxerr;
+
 	if (isrc & IRQ_DOI) {
 		/* data overrun interrupt */
 		netdev_dbg(dev, "data overrun interrupt\n");
@@ -407,13 +422,11 @@
 		/* error warning interrupt */
 		netdev_dbg(dev, "error warning interrupt\n");
 
-		if (status & SR_BS) {
+		if (status & SR_BS)
 			state = CAN_STATE_BUS_OFF;
-			cf->can_id |= CAN_ERR_BUSOFF;
-			can_bus_off(dev);
-		} else if (status & SR_ES) {
+		else if (status & SR_ES)
 			state = CAN_STATE_ERROR_WARNING;
-		} else
+		else
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
 	if (isrc & IRQ_BEI) {
@@ -436,7 +449,6 @@
 			cf->data[2] |= CAN_ERR_PROT_STUFF;
 			break;
 		default:
-			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 			cf->data[3] = ecc & ECC_SEG;
 			break;
 		}
@@ -447,10 +459,11 @@
 	if (isrc & IRQ_EPI) {
 		/* error passive interrupt */
 		netdev_dbg(dev, "error passive interrupt\n");
-		if (status & SR_ES)
-			state = CAN_STATE_ERROR_PASSIVE;
+
+		if (state == CAN_STATE_ERROR_PASSIVE)
+			state = CAN_STATE_ERROR_WARNING;
 		else
-			state = CAN_STATE_ERROR_ACTIVE;
+			state = CAN_STATE_ERROR_PASSIVE;
 	}
 	if (isrc & IRQ_ALI) {
 		/* arbitration lost interrupt */
@@ -462,32 +475,19 @@
 		cf->data[0] = alc & 0x1f;
 	}
 
-	if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
-					 state == CAN_STATE_ERROR_PASSIVE)) {
-		uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR);
-		uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR);
-		cf->can_id |= CAN_ERR_CRTL;
-		if (state == CAN_STATE_ERROR_WARNING) {
-			priv->can.can_stats.error_warning++;
-			cf->data[1] = (txerr > rxerr) ?
-				CAN_ERR_CRTL_TX_WARNING :
-				CAN_ERR_CRTL_RX_WARNING;
-		} else {
-			priv->can.can_stats.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;
-	}
+	if (state != priv->can.state) {
+		tx_state = txerr >= rxerr ? state : 0;
+		rx_state = txerr <= rxerr ? state : 0;
 
-	priv->can.state = state;
+		can_change_state(dev, cf, tx_state, rx_state);
 
-	netif_rx(skb);
+		if(state == CAN_STATE_BUS_OFF)
+			can_bus_off(dev);
+	}
 
 	stats->rx_packets++;
 	stats->rx_bytes += cf->can_dlc;
+	netif_rx(skb);
 
 	return 0;
 }
@@ -629,9 +629,12 @@
 	priv->can.do_set_bittiming = sja1000_set_bittiming;
 	priv->can.do_set_mode = sja1000_set_mode;
 	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
-	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
-		CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
-		CAN_CTRLMODE_ONE_SHOT;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+				       CAN_CTRLMODE_LISTENONLY |
+				       CAN_CTRLMODE_3_SAMPLES |
+				       CAN_CTRLMODE_ONE_SHOT |
+				       CAN_CTRLMODE_BERR_REPORTING |
+				       CAN_CTRLMODE_PRESUME_ACK;
 
 	spin_lock_init(&priv->cmdreg_lock);
 
@@ -649,9 +652,10 @@
 EXPORT_SYMBOL_GPL(free_sja1000dev);
 
 static const struct net_device_ops sja1000_netdev_ops = {
-       .ndo_open               = sja1000_open,
-       .ndo_stop               = sja1000_close,
-       .ndo_start_xmit         = sja1000_start_xmit,
+	.ndo_open	= sja1000_open,
+	.ndo_stop	= sja1000_close,
+	.ndo_start_xmit	= sja1000_start_xmit,
+	.ndo_change_mtu	= can_change_mtu,
 };
 
 int register_sja1000dev(struct net_device *dev)