pull-request: can 2015-03-22

pull-request: can 2015-03-22

[Marc Kleine-Budde]

Hello David,

this is a pull-request of 7 patches for net/master.

Ahmed S. Darwish fixes another two problems in the kvaser_usb driver. A patch
by Colin Ian King for the gs_usb driver adds a missing check for kzalloc
allocation failures. Two patches by Stephane Grosjean for the peak_usb driver
add missing support for ISO / non-ISO mode switching. Andri Yngvason
contributes a patch to fix the state handling in the flexcan driver. The last
patch by Andreas Werner for the flexcan driver add missing EPROBE_DEFER
handling for the transceiver regulator.

regards,
Marc
---

The following changes since commit f40bff4239d45ac061044a8a79cf6868c62df345:

  cx82310_eth: wait for firmware to become ready (2015-03-21 18:23:19 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git tags/linux-can-fixes-for-4.0-20150322

for you to fetch changes up to 555828ef45f825d6ee06559f0304163550eed380:

  can: flexcan: Deferred on Regulator return EPROBE_DEFER (2015-03-22 19:20:10 +0100)

----------------------------------------------------------------
linux-can-fixes-for-4.0-20150322

----------------------------------------------------------------
Ahmed S. Darwish (2):
      can: kvaser_usb: Comply with firmware max tx URBs value
      can: kvaser_usb: Fix sparse warning __le16 degrades to integer

Andreas Werner (1):
      can: flexcan: Deferred on Regulator return EPROBE_DEFER

Andri Yngvason (1):
      can: flexcan: fix bus-off error state handling.

Colin Ian King (1):
      can: gs_usb: check for kzalloc allocation failure

Stephane Grosjean (2):
      can: peak_usb: rename usb option cmds definition and structs
      can: peak_usb_fd: add support for ISO / non-ISO mode switching

 drivers/net/can/flexcan.c                  | 18 +++++---
 drivers/net/can/usb/gs_usb.c               |  2 +
 drivers/net/can/usb/kvaser_usb.c           | 69 +++++++++++++++++-----------
 drivers/net/can/usb/peak_usb/pcan_ucan.h   | 15 +++---
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 73 ++++++++++++++++++++----------
 5 files changed, 113 insertions(+), 64 deletions(-)

[PATCH 1/7] can: kvaser_usb: Comply with firmware max tx URBs value

[Marc Kleine-Budde]

From: "Ahmed S. Darwish" <ahmed.darwish@valeo.com>

Current driver code arbitrarily assumes a max outstanding tx
value of 16 parallel transmissions. Meanwhile, the device
firmware provides its actual maximum inside its reply to the
CMD_GET_SOFTWARE_INFO message.

Under heavy tx traffic, if the interleaved transmissions count
increases above the limit reported by firmware, the firmware
breaks up badly, reports a massive list of internal errors, and
the candump traces hardly matches the actual frames sent and
received.

On the other hand, in certain models, the firmware can support
up to 48 tx URBs instead of just 16, increasing the driver
throughput by two-fold and reducing the possibility of -ENOBUFs.

Thus dynamically set the driver's max tx URBs value according
to firmware replies.

Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/kvaser_usb.c | 62 ++++++++++++++++++++++++----------------
 1 file changed, 38 insertions(+), 24 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index e97a08ce0b90..2f9733a8e125 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -25,7 +25,6 @@
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
 
-#define MAX_TX_URBS			16
 #define MAX_RX_URBS			4
 #define START_TIMEOUT			1000 /* msecs */
 #define STOP_TIMEOUT			1000 /* msecs */
@@ -443,6 +442,7 @@ struct kvaser_usb_error_summary {
 	};
 };
 
+/* Context for an outstanding, not yet ACKed, transmission */
 struct kvaser_usb_tx_urb_context {
 	struct kvaser_usb_net_priv *priv;
 	u32 echo_index;
@@ -456,8 +456,13 @@ struct kvaser_usb {
 	struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 	struct usb_anchor rx_submitted;
 
+	/* @max_tx_urbs: Firmware-reported maximum number of oustanding,
+	 * not yet ACKed, transmissions on this device. This value is
+	 * also used as a sentinel for marking free tx contexts.
+	 */
 	u32 fw_version;
 	unsigned int nchannels;
+	unsigned int max_tx_urbs;
 	enum kvaser_usb_family family;
 
 	bool rxinitdone;
@@ -467,19 +472,18 @@ struct kvaser_usb {
 
 struct kvaser_usb_net_priv {
 	struct can_priv can;
-
-	spinlock_t tx_contexts_lock;
-	int active_tx_contexts;
-	struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
-
-	struct usb_anchor tx_submitted;
-	struct completion start_comp, stop_comp;
+	struct can_berr_counter bec;
 
 	struct kvaser_usb *dev;
 	struct net_device *netdev;
 	int channel;
 
-	struct can_berr_counter bec;
+	struct completion start_comp, stop_comp;
+	struct usb_anchor tx_submitted;
+
+	spinlock_t tx_contexts_lock;
+	int active_tx_contexts;
+	struct kvaser_usb_tx_urb_context tx_contexts[];
 };
 
 static const struct usb_device_id kvaser_usb_table[] = {
@@ -657,9 +661,13 @@ static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 	switch (dev->family) {
 	case KVASER_LEAF:
 		dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
+		dev->max_tx_urbs =
+			le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
 		break;
 	case KVASER_USBCAN:
 		dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
+		dev->max_tx_urbs =
+			le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
 		break;
 	}
 
@@ -715,7 +723,7 @@ static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 
 	stats = &priv->netdev->stats;
 
-	context = &priv->tx_contexts[tid % MAX_TX_URBS];
+	context = &priv->tx_contexts[tid % dev->max_tx_urbs];
 
 	/* Sometimes the state change doesn't come after a bus-off event */
 	if (priv->can.restart_ms &&
@@ -744,7 +752,7 @@ static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 	spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 
 	can_get_echo_skb(priv->netdev, context->echo_index);
-	context->echo_index = MAX_TX_URBS;
+	context->echo_index = dev->max_tx_urbs;
 	--priv->active_tx_contexts;
 	netif_wake_queue(priv->netdev);
 
@@ -1512,11 +1520,13 @@ error:
 
 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
 {
-	int i;
+	int i, max_tx_urbs;
+
+	max_tx_urbs = priv->dev->max_tx_urbs;
 
 	priv->active_tx_contexts = 0;
-	for (i = 0; i < MAX_TX_URBS; i++)
-		priv->tx_contexts[i].echo_index = MAX_TX_URBS;
+	for (i = 0; i < max_tx_urbs; i++)
+		priv->tx_contexts[i].echo_index = max_tx_urbs;
 }
 
 /* This method might sleep. Do not call it in the atomic context
@@ -1702,14 +1712,14 @@ static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
 		*msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
 
 	spin_lock_irqsave(&priv->tx_contexts_lock, flags);
-	for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
-		if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
+	for (i = 0; i < dev->max_tx_urbs; i++) {
+		if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
 			context = &priv->tx_contexts[i];
 
 			context->echo_index = i;
 			can_put_echo_skb(skb, netdev, context->echo_index);
 			++priv->active_tx_contexts;
-			if (priv->active_tx_contexts >= MAX_TX_URBS)
+			if (priv->active_tx_contexts >= dev->max_tx_urbs)
 				netif_stop_queue(netdev);
 
 			break;
@@ -1743,7 +1753,7 @@ static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
 		spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 
 		can_free_echo_skb(netdev, context->echo_index);
-		context->echo_index = MAX_TX_URBS;
+		context->echo_index = dev->max_tx_urbs;
 		--priv->active_tx_contexts;
 		netif_wake_queue(netdev);
 
@@ -1881,7 +1891,9 @@ static int kvaser_usb_init_one(struct usb_interface *intf,
 	if (err)
 		return err;
 
-	netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
+	netdev = alloc_candev(sizeof(*priv) +
+			      dev->max_tx_urbs * sizeof(*priv->tx_contexts),
+			      dev->max_tx_urbs);
 	if (!netdev) {
 		dev_err(&intf->dev, "Cannot alloc candev\n");
 		return -ENOMEM;
@@ -2009,6 +2021,13 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 		return err;
 	}
 
+	dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
+		((dev->fw_version >> 24) & 0xff),
+		((dev->fw_version >> 16) & 0xff),
+		(dev->fw_version & 0xffff));
+
+	dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
+
 	err = kvaser_usb_get_card_info(dev);
 	if (err) {
 		dev_err(&intf->dev,
@@ -2016,11 +2035,6 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 		return err;
 	}
 
-	dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
-		((dev->fw_version >> 24) & 0xff),
-		((dev->fw_version >> 16) & 0xff),
-		(dev->fw_version & 0xffff));
-
 	for (i = 0; i < dev->nchannels; i++) {
 		err = kvaser_usb_init_one(intf, id, i);
 		if (err) {
-- 
2.1.4

[PATCH 2/7] can: kvaser_usb: Fix sparse warning __le16 degrades to integer

[Marc Kleine-Budde]

From: "Ahmed S. Darwish" <ahmed.darwish@valeo.com>

USB endpoint's wMaxPacketSize field is an le16 entity. Use
appropriate le16_to_cpu macros to maintain endian independence.

Reported-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/kvaser_usb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 2f9733a8e125..57611fd91229 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -596,8 +596,8 @@ static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 			 * for further details.
 			 */
 			if (tmp->len == 0) {
-				pos = round_up(pos,
-					       dev->bulk_in->wMaxPacketSize);
+				pos = round_up(pos, le16_to_cpu(dev->bulk_in->
+								wMaxPacketSize));
 				continue;
 			}
 
@@ -1337,7 +1337,8 @@ static void kvaser_usb_read_bulk_callback(struct urb *urb)
 		 * number of events in case of a heavy rx load on the bus.
 		 */
 		if (msg->len == 0) {
-			pos = round_up(pos, dev->bulk_in->wMaxPacketSize);
+			pos = round_up(pos, le16_to_cpu(dev->bulk_in->
+							wMaxPacketSize));
 			continue;
 		}
 
-- 
2.1.4

[PATCH 3/7] can: gs_usb: check for kzalloc allocation failure

[Marc Kleine-Budde]

From: Colin Ian King <colin.king@canonical.com>

smatch detected the following issue:
drivers/net/can/usb/gs_usb.c:904 gs_usb_probe() error:
   potential null dereference 'dev'.  (kzalloc returns null)

Add a check for null return from kzalloc and return -ENOMEM

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/gs_usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 009acc8641fc..8b4d3e6875eb 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -901,6 +901,8 @@ static int gs_usb_probe(struct usb_interface *intf, const struct usb_device_id *
 	}
 
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
 	init_usb_anchor(&dev->rx_submitted);
 
 	atomic_set(&dev->active_channels, 0);
-- 
2.1.4

[PATCH 4/7] can: peak_usb: rename usb option cmds definition and structs

[Marc Kleine-Budde]

From: Stephane Grosjean <s.grosjean@peak-system.com>

The PUCAN_CMD_RX_FRAME_(ENABLE|DISABLE) command has extended its purpose
and was therefore renamed to PUCAN_CMD_SET_(EN|DIS)_OPTION.

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_ucan.h   | 14 +++++-----
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 42 +++++++++++++++---------------
 2 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_ucan.h b/drivers/net/can/usb/peak_usb/pcan_ucan.h
index 1ba7c25002e1..1fb33307be4e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_ucan.h
+++ b/drivers/net/can/usb/peak_usb/pcan_ucan.h
@@ -26,8 +26,8 @@
 #define PUCAN_CMD_FILTER_STD		0x008
 #define PUCAN_CMD_TX_ABORT		0x009
 #define PUCAN_CMD_WR_ERR_CNT		0x00a
-#define PUCAN_CMD_RX_FRAME_ENABLE	0x00b
-#define PUCAN_CMD_RX_FRAME_DISABLE	0x00c
+#define PUCAN_CMD_SET_EN_OPTION		0x00b
+#define PUCAN_CMD_CLR_DIS_OPTION	0x00c
 #define PUCAN_CMD_END_OF_COLLECTION	0x3ff
 
 /* uCAN received messages list */
@@ -101,14 +101,14 @@ struct __packed pucan_wr_err_cnt {
 	u16	unused;
 };
 
-/* uCAN RX_FRAME_ENABLE command fields */
-#define PUCAN_FLTEXT_ERROR		0x0001
-#define PUCAN_FLTEXT_BUSLOAD		0x0002
+/* uCAN SET_EN/CLR_DIS _OPTION command fields */
+#define PUCAN_OPTION_ERROR		0x0001
+#define PUCAN_OPTION_BUSLOAD		0x0002
 
-struct __packed pucan_filter_ext {
+struct __packed pucan_options {
 	__le16	opcode_channel;
 
-	__le16	ext_mask;
+	__le16	options;
 	u32	unused;
 };
 
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 0bac0f14edc3..7506a8352edd 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -110,13 +110,13 @@ struct __packed pcan_ufd_led {
 	u8	unused[5];
 };
 
-/* Extended usage of uCAN commands CMD_RX_FRAME_xxxABLE for PCAN-USB Pro FD */
+/* Extended usage of uCAN commands CMD_xxx_xx_OPTION for PCAN-USB Pro FD */
 #define PCAN_UFD_FLTEXT_CALIBRATION	0x8000
 
-struct __packed pcan_ufd_filter_ext {
+struct __packed pcan_ufd_options {
 	__le16	opcode_channel;
 
-	__le16	ext_mask;
+	__le16	ucan_mask;
 	u16	unused;
 	__le16	usb_mask;
 };
@@ -321,21 +321,21 @@ static int pcan_usb_fd_set_filter_std(struct peak_usb_device *dev, int idx,
 	return pcan_usb_fd_send_cmd(dev, cmd);
 }
 
-/* set/unset notifications filter:
+/* set/unset options
  *
- *	onoff	sets(1)/unset(0) notifications
- *	mask	each bit defines a kind of notification to set/unset
+ *	onoff	set(1)/unset(0) options
+ *	mask	each bit defines a kind of options to set/unset
  */
-static int pcan_usb_fd_set_filter_ext(struct peak_usb_device *dev,
-				      bool onoff, u16 ext_mask, u16 usb_mask)
+static int pcan_usb_fd_set_options(struct peak_usb_device *dev,
+				   bool onoff, u16 ucan_mask, u16 usb_mask)
 {
-	struct pcan_ufd_filter_ext *cmd = pcan_usb_fd_cmd_buffer(dev);
+	struct pcan_ufd_options *cmd = pcan_usb_fd_cmd_buffer(dev);
 
 	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
-					(onoff) ? PUCAN_CMD_RX_FRAME_ENABLE :
-						  PUCAN_CMD_RX_FRAME_DISABLE);
+					(onoff) ? PUCAN_CMD_SET_EN_OPTION :
+						  PUCAN_CMD_CLR_DIS_OPTION);
 
-	cmd->ext_mask = cpu_to_le16(ext_mask);
+	cmd->ucan_mask = cpu_to_le16(ucan_mask);
 	cmd->usb_mask = cpu_to_le16(usb_mask);
 
 	/* send the command */
@@ -770,9 +770,9 @@ static int pcan_usb_fd_start(struct peak_usb_device *dev)
 				       &pcan_usb_pro_fd);
 
 		/* enable USB calibration messages */
-		err = pcan_usb_fd_set_filter_ext(dev, 1,
-						 PUCAN_FLTEXT_ERROR,
-						 PCAN_UFD_FLTEXT_CALIBRATION);
+		err = pcan_usb_fd_set_options(dev, 1,
+					      PUCAN_OPTION_ERROR,
+					      PCAN_UFD_FLTEXT_CALIBRATION);
 	}
 
 	pdev->usb_if->dev_opened_count++;
@@ -806,9 +806,9 @@ static int pcan_usb_fd_stop(struct peak_usb_device *dev)
 
 	/* turn off special msgs for that interface if no other dev opened */
 	if (pdev->usb_if->dev_opened_count == 1)
-		pcan_usb_fd_set_filter_ext(dev, 0,
-					   PUCAN_FLTEXT_ERROR,
-					   PCAN_UFD_FLTEXT_CALIBRATION);
+		pcan_usb_fd_set_options(dev, 0,
+					PUCAN_OPTION_ERROR,
+					PCAN_UFD_FLTEXT_CALIBRATION);
 	pdev->usb_if->dev_opened_count--;
 
 	return 0;
@@ -937,9 +937,9 @@ static void pcan_usb_fd_exit(struct peak_usb_device *dev)
 	if (dev->ctrl_idx == 0) {
 		/* turn off calibration message if any device were opened */
 		if (pdev->usb_if->dev_opened_count > 0)
-			pcan_usb_fd_set_filter_ext(dev, 0,
-						   PUCAN_FLTEXT_ERROR,
-						   PCAN_UFD_FLTEXT_CALIBRATION);
+			pcan_usb_fd_set_options(dev, 0,
+						PUCAN_OPTION_ERROR,
+						PCAN_UFD_FLTEXT_CALIBRATION);
 
 		/* tell USB adapter that the driver is being unloaded */
 		pcan_usb_fd_drv_loaded(dev, 0);
-- 
2.1.4

[PATCH 5/7] can: peak_usb_fd: add support for ISO / non-ISO mode switching

[Marc Kleine-Budde]

From: Stephane Grosjean <s.grosjean@peak-system.com>

The PCAN USB (pro) FD adapters with firmware versions > 2.x support the
switching between ISO (default) and non-ISO conform bitstreams on the CAN bus.
The setting for the 2.x firmware adapters can be modified with the 'ip' tool
from the iproute2 package (option: fd-non-iso [on|off]).

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_ucan.h   |  1 +
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 31 ++++++++++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_ucan.h b/drivers/net/can/usb/peak_usb/pcan_ucan.h
index 1fb33307be4e..e8fc4952c6b0 100644
--- a/drivers/net/can/usb/peak_usb/pcan_ucan.h
+++ b/drivers/net/can/usb/peak_usb/pcan_ucan.h
@@ -104,6 +104,7 @@ struct __packed pucan_wr_err_cnt {
 /* uCAN SET_EN/CLR_DIS _OPTION command fields */
 #define PUCAN_OPTION_ERROR		0x0001
 #define PUCAN_OPTION_BUSLOAD		0x0002
+#define PUCAN_OPTION_CANDFDISO		0x0004
 
 struct __packed pucan_options {
 	__le16	opcode_channel;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 7506a8352edd..a9221ad9f1a0 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -251,6 +251,27 @@ static int pcan_usb_fd_build_restart_cmd(struct peak_usb_device *dev, u8 *buf)
 	/* moves the pointer forward */
 	pc += sizeof(struct pucan_wr_err_cnt);
 
+	/* add command to switch from ISO to non-ISO mode, if fw allows it */
+	if (dev->can.ctrlmode_supported & CAN_CTRLMODE_FD_NON_ISO) {
+		struct pucan_options *puo = (struct pucan_options *)pc;
+
+		puo->opcode_channel =
+			(dev->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO) ?
+			pucan_cmd_opcode_channel(dev,
+						 PUCAN_CMD_CLR_DIS_OPTION) :
+			pucan_cmd_opcode_channel(dev, PUCAN_CMD_SET_EN_OPTION);
+
+		puo->options = cpu_to_le16(PUCAN_OPTION_CANDFDISO);
+
+		/* to be sure that no other extended bits will be taken into
+		 * account
+		 */
+		puo->unused = 0;
+
+		/* moves the pointer forward */
+		pc += sizeof(struct pucan_options);
+	}
+
 	/* next, go back to operational mode */
 	cmd = (struct pucan_command *)pc;
 	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
@@ -860,8 +881,14 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 			 pdev->usb_if->fw_info.fw_version[2],
 			 dev->adapter->ctrl_count);
 
-		/* the currently supported hw is non-ISO */
-		dev->can.ctrlmode = CAN_CTRLMODE_FD_NON_ISO;
+		/* check for ability to switch between ISO/non-ISO modes */
+		if (pdev->usb_if->fw_info.fw_version[0] >= 2) {
+			/* firmware >= 2.x supports ISO/non-ISO switching */
+			dev->can.ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
+		} else {
+			/* firmware < 2.x only supports fixed(!) non-ISO */
+			dev->can.ctrlmode |= CAN_CTRLMODE_FD_NON_ISO;
+		}
 
 		/* tell the hardware the can driver is running */
 		err = pcan_usb_fd_drv_loaded(dev, 1);
-- 
2.1.4

[PATCH 6/7] can: flexcan: fix bus-off error state handling.

[Marc Kleine-Budde]

From: Andri Yngvason <andri.yngvason@marel.com>

Making sure that the bus-off state gets passed to can_change_state().

Signed-off-by: Andri Yngvason <andri.yngvason@marel.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/flexcan.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 80c46ad4cee4..ee944ae6bb96 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -592,13 +592,12 @@ static int flexcan_poll_state(struct net_device *dev, u32 reg_esr)
 		rx_state = unlikely(reg_esr & FLEXCAN_ESR_RX_WRN) ?
 			   CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
 		new_state = max(tx_state, rx_state);
-	} else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) {
+	} else {
 		__flexcan_get_berr_counter(dev, &bec);
-		new_state = CAN_STATE_ERROR_PASSIVE;
+		new_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ?
+			    CAN_STATE_ERROR_PASSIVE : CAN_STATE_BUS_OFF;
 		rx_state = bec.rxerr >= bec.txerr ? new_state : 0;
 		tx_state = bec.rxerr <= bec.txerr ? new_state : 0;
-	} else {
-		new_state = CAN_STATE_BUS_OFF;
 	}
 
 	/* state hasn't changed */
-- 
2.1.4

[PATCH 7/7] can: flexcan: Deferred on Regulator return EPROBE_DEFER

[Marc Kleine-Budde]

From: Andreas Werner <kernel@andy89.org>

Return EPROBE_DEFER if Regulator returns EPROBE_DEFER

If the Flexcan driver is built into kernel and a regulator is used to
enable the CAN transceiver, the Flexcan driver may not use the regulator.

When initializing the Flexcan device with a regulator defined in the device
tree, but not initialized, the regulator subsystem returns EPROBE_DEFER, hence
the Flexcan init fails.

The solution for this is to return EPROBE_DEFER if regulator is not initialized
and wait until the regulator is initialized.

Signed-off-by: Andreas Werner <kernel@andy89.org>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/flexcan.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index ee944ae6bb96..ad0a7e8c2c2b 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1157,12 +1157,19 @@ static int flexcan_probe(struct platform_device *pdev)
 	const struct flexcan_devtype_data *devtype_data;
 	struct net_device *dev;
 	struct flexcan_priv *priv;
+	struct regulator *reg_xceiver;
 	struct resource *mem;
 	struct clk *clk_ipg = NULL, *clk_per = NULL;
 	void __iomem *base;
 	int err, irq;
 	u32 clock_freq = 0;
 
+	reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");
+	if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
+	else if (IS_ERR(reg_xceiver))
+		reg_xceiver = NULL;
+
 	if (pdev->dev.of_node)
 		of_property_read_u32(pdev->dev.of_node,
 						"clock-frequency", &clock_freq);
@@ -1223,9 +1230,7 @@ static int flexcan_probe(struct platform_device *pdev)
 	priv->pdata = dev_get_platdata(&pdev->dev);
 	priv->devtype_data = devtype_data;
 
-	priv->reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");
-	if (IS_ERR(priv->reg_xceiver))
-		priv->reg_xceiver = NULL;
+	priv->reg_xceiver = reg_xceiver;
 
 	netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT);
 
-- 
2.1.4

Re: pull-request: can 2015-03-22

[David Miller]

From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Sun, 22 Mar 2015 20:13:31 +0100

> this is a pull-request of 7 patches for net/master.
> 
> Ahmed S. Darwish fixes another two problems in the kvaser_usb driver. A patch
> by Colin Ian King for the gs_usb driver adds a missing check for kzalloc
> allocation failures. Two patches by Stephane Grosjean for the peak_usb driver
> add missing support for ISO / non-ISO mode switching. Andri Yngvason
> contributes a patch to fix the state handling in the flexcan driver. The last
> patch by Andreas Werner for the flexcan driver add missing EPROBE_DEFER
> handling for the transceiver regulator.

Pulled, thanks Marc.