From ee6f0988a69b3a81bcea0871418ecf5db332149c Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Thu, 24 Mar 2011 02:34:32 +0000 Subject: can: c_can: disable one shot mode until driver is fixed This patch disables the one shot mode, until the driver has been fixed and tested to support it. > I'm quite sure I've seen a situation where msg_obj 17 "seemed" to be > pending, while msg_obj 18 and 19 already have been transmitted. But > in that case, I enabled ONESHOT for the can interface, which enables > the DA mode (automatic retransmission is disabled). Reported-by: Jan Altenberg Signed-off-by: Marc Kleine-Budde Signed-off-by: Kurt Van Dijck Cc: Bhupesh Sharma Acked-by: Wolfgang Grandegger Signed-off-by: David S. Miller --- drivers/net/can/c_can/c_can.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index 110eda01843..d0bffb08aef 100644 --- a/drivers/net/can/c_can/c_can.c +++ b/drivers/net/can/c_can/c_can.c @@ -588,14 +588,9 @@ static void c_can_chip_config(struct net_device *dev) { struct c_can_priv *priv = netdev_priv(dev); - if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) - /* disable automatic retransmission */ - priv->write_reg(priv, &priv->regs->control, - CONTROL_DISABLE_AR); - else - /* enable automatic retransmission */ - priv->write_reg(priv, &priv->regs->control, - CONTROL_ENABLE_AR); + /* enable automatic retransmission */ + priv->write_reg(priv, &priv->regs->control, + CONTROL_ENABLE_AR); if (priv->can.ctrlmode & (CAN_CTRLMODE_LISTENONLY & CAN_CTRLMODE_LOOPBACK)) { @@ -1112,8 +1107,7 @@ struct net_device *alloc_c_can_dev(void) priv->can.bittiming_const = &c_can_bittiming_const; priv->can.do_set_mode = c_can_set_mode; priv->can.do_get_berr_counter = c_can_get_berr_counter; - priv->can.ctrlmode_supported = CAN_CTRLMODE_ONE_SHOT | - CAN_CTRLMODE_LOOPBACK | + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_BERR_REPORTING; -- cgit v1.2.3-18-g5258 From b0052b088cf0cb688b4630c1d520c57276da71a5 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Thu, 24 Mar 2011 02:34:33 +0000 Subject: can: c_can_platform: fix irq check in probe This patch fixes the check in the probe function whether a IRQ was supplied to the driver. The original driver check the irq "struct resource *" against <= 0. Use "platform_get_irq" instead. Signed-off-by: Marc Kleine-Budde Cc: Bhupesh Sharma Signed-off-by: David S. Miller --- drivers/net/can/c_can/c_can_platform.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index e629b961ae2..cc90824f2c9 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -73,7 +73,8 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev) void __iomem *addr; struct net_device *dev; struct c_can_priv *priv; - struct resource *mem, *irq; + struct resource *mem; + int irq; #ifdef CONFIG_HAVE_CLK struct clk *clk; @@ -88,8 +89,8 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev) /* get the platform data */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!mem || (irq <= 0)) { + irq = platform_get_irq(pdev, 0); + if (!mem || irq <= 0) { ret = -ENODEV; goto exit_free_clk; } @@ -117,7 +118,7 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev) priv = netdev_priv(dev); - dev->irq = irq->start; + dev->irq = irq; priv->regs = addr; #ifdef CONFIG_HAVE_CLK priv->can.clock.freq = clk_get_rate(clk); -- cgit v1.2.3-18-g5258 From dc760b375e50a47847d4942811bd9679beeb5535 Mon Sep 17 00:00:00 2001 From: Jan Altenberg Date: Sun, 27 Mar 2011 18:24:10 -0700 Subject: can: c_can: Fix tx_bytes accounting The current SocketCAN implementation for the Bosch c_can cell doesn't account the TX bytes correctly, because it calls c_can_inval_msg_object() (which clears the msg ctrl register) before reading the DLC value: for (/* nix */; (priv->tx_next - priv->tx_echo) > 0; priv->tx_echo++) { msg_obj_no = get_tx_echo_msg_obj(priv); c_can_inval_msg_object(dev, 0, msg_obj_no); val = c_can_read_reg32(priv, &priv->regs->txrqst1); if (!(val & (1 << msg_obj_no))) { can_get_echo_skb(dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST); stats->tx_bytes += priv->read_reg(priv, &priv->regs->ifregs[0].msg_cntrl) & IF_MCONT_DLC_MASK; stats->tx_packets++; } } So, we will always read 0 for the DLC value and "ifconfig" will report *0* TX Bytes. The fix is quite easy: Just move c_can_inval_msg_object() to the end of the if() statement. So: * We only call c_can_inval_msg_object() if the message was actually transmitted * We read out the DLC value _before_ clearing the msg ctrl register Signed-off-by: Jan Altenberg Acked-by: Kurt Van Dijck Acked-by: Wolfgang Grandegger Signed-off-by: David S. Miller --- drivers/net/can/c_can/c_can.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index d0bffb08aef..31552959aed 100644 --- a/drivers/net/can/c_can/c_can.c +++ b/drivers/net/can/c_can/c_can.c @@ -699,7 +699,6 @@ static void c_can_do_tx(struct net_device *dev) for (/* nix */; (priv->tx_next - priv->tx_echo) > 0; priv->tx_echo++) { msg_obj_no = get_tx_echo_msg_obj(priv); - c_can_inval_msg_object(dev, 0, msg_obj_no); val = c_can_read_reg32(priv, &priv->regs->txrqst1); if (!(val & (1 << msg_obj_no))) { can_get_echo_skb(dev, @@ -708,6 +707,7 @@ static void c_can_do_tx(struct net_device *dev) &priv->regs->ifregs[0].msg_cntrl) & IF_MCONT_DLC_MASK; stats->tx_packets++; + c_can_inval_msg_object(dev, 0, msg_obj_no); } } -- cgit v1.2.3-18-g5258