Merge tag 'linux-can-fixes-for-4.7-20160620' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2016-06-20

this is a pull request of 3 patches for the upcoming linux-4.7 release.

The first patch is by Thor Thayer for the c_can/d_can driver. It fixes the
registar access on Altera Cyclone devices, which caused CAN frames to have 0x0
in the first two bytes incorrectly. Wolfgang Grandegger's patch for the at91
driver fixes a hanging driver under high bus load situations. A patch for the
gs_usb driver by Maximilian Schneider adds support for the bytewerk.org
candleLight interface.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/at91_can.c

@@ -712,9 +712,10 @@ static int at91_poll_rx(struct net_device *dev, int quota)
 
 	/* upper group completed, look again in lower */
 	if (priv->rx_next > get_mb_rx_low_last(priv) &&
-	    quota > 0 && mb > get_mb_rx_last(priv)) {
+	    mb > get_mb_rx_last(priv)) {
 		priv->rx_next = get_mb_rx_first(priv);
-		goto again;
+		if (quota > 0)
+			goto again;
 	}
 
 	return received;

drivers/net/can/c_can/c_can.c

@@ -332,9 +332,23 @@ static void c_can_setup_tx_object(struct net_device *dev, int iface,
 
 	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), ctrl);
 
-	for (i = 0; i < frame->can_dlc; i += 2) {
-		priv->write_reg(priv, C_CAN_IFACE(DATA1_REG, iface) + i / 2,
-				frame->data[i] | (frame->data[i + 1] << 8));
+	if (priv->type == BOSCH_D_CAN) {
+		u32 data = 0, dreg = C_CAN_IFACE(DATA1_REG, iface);
+
+		for (i = 0; i < frame->can_dlc; i += 4, dreg += 2) {
+			data = (u32)frame->data[i];
+			data |= (u32)frame->data[i + 1] << 8;
+			data |= (u32)frame->data[i + 2] << 16;
+			data |= (u32)frame->data[i + 3] << 24;
+			priv->write_reg32(priv, dreg, data);
+		}
+	} else {
+		for (i = 0; i < frame->can_dlc; i += 2) {
+			priv->write_reg(priv,
+					C_CAN_IFACE(DATA1_REG, iface) + i / 2,
+					frame->data[i] |
+					(frame->data[i + 1] << 8));
+		}
 	}
 }
 
@@ -402,10 +416,20 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, u32 ctrl)
 	} else {
 		int i, dreg = C_CAN_IFACE(DATA1_REG, iface);
 
-		for (i = 0; i < frame->can_dlc; i += 2, dreg ++) {
-			data = priv->read_reg(priv, dreg);
-			frame->data[i] = data;
-			frame->data[i + 1] = data >> 8;
+		if (priv->type == BOSCH_D_CAN) {
+			for (i = 0; i < frame->can_dlc; i += 4, dreg += 2) {
+				data = priv->read_reg32(priv, dreg);
+				frame->data[i] = data;
+				frame->data[i + 1] = data >> 8;
+				frame->data[i + 2] = data >> 16;
+				frame->data[i + 3] = data >> 24;
+			}
+		} else {
+			for (i = 0; i < frame->can_dlc; i += 2, dreg++) {
+				data = priv->read_reg(priv, dreg);
+				frame->data[i] = data;
+				frame->data[i + 1] = data >> 8;
+			}
 		}
 	}
 

drivers/net/can/usb/Kconfig

@@ -16,7 +16,8 @@ config CAN_ESD_USB2
 config CAN_GS_USB
 	tristate "Geschwister Schneider UG interfaces"
 	---help---
-	  This driver supports the Geschwister Schneider USB/CAN devices.
+	  This driver supports the Geschwister Schneider and bytewerk.org
+	  candleLight USB CAN interfaces USB/CAN devices
 	  If unsure choose N,
 	  choose Y for built in support,
 	  M to compile as module (module will be named: gs_usb).

drivers/net/can/usb/gs_usb.c

@@ -1,7 +1,9 @@
-/* CAN driver for Geschwister Schneider USB/CAN devices.
+/* CAN driver for Geschwister Schneider USB/CAN devices
+ * and bytewerk.org candleLight USB CAN interfaces.
  *
- * Copyright (C) 2013 Geschwister Schneider Technologie-,
+ * Copyright (C) 2013-2016 Geschwister Schneider Technologie-,
  * Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
+ * Copyright (C) 2016 Hubert Denkmair
  *
  * Many thanks to all socketcan devs!
  *
@@ -29,6 +31,9 @@
 #define USB_GSUSB_1_VENDOR_ID      0x1d50
 #define USB_GSUSB_1_PRODUCT_ID     0x606f
 
+#define USB_CANDLELIGHT_VENDOR_ID  0x1209
+#define USB_CANDLELIGHT_PRODUCT_ID 0x2323
+
 #define GSUSB_ENDPOINT_IN          1
 #define GSUSB_ENDPOINT_OUT         2
 
@@ -952,6 +957,8 @@ static void gs_usb_disconnect(struct usb_interface *intf)
 static const struct usb_device_id gs_usb_table[] = {
 	{ USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID,
 				      USB_GSUSB_1_PRODUCT_ID, 0) },
+	{ USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
+				      USB_CANDLELIGHT_PRODUCT_ID, 0) },
 	{} /* Terminating entry */
 };
 
@@ -969,5 +976,6 @@ module_usb_driver(gs_usb_driver);
 MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
 MODULE_DESCRIPTION(
 "Socket CAN device driver for Geschwister Schneider Technologie-, "
-"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces.");
+"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
+"and bytewerk.org candleLight USB CAN interfaces.");
 MODULE_LICENSE("GPL v2");