From ad2302345d59d29232cb668baaae9e840925d153 Mon Sep 17 00:00:00 2001 From: "ZHU Yi (ST-FIR/ENG1-Zhu)" Date: Fri, 15 Sep 2017 06:59:15 +0000 Subject: can: flexcan: fix state transition regression Update state upon any interrupt to report correct state transitions in case the flexcan core enabled the broken error state quirk fix. Signed-off-by: Zhu Yi Signed-off-by: Mark Jonas Acked-by: Wolfgang Grandegger Cc: linux-stable # >= v4.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 13f0f219d8aa..df4bfb83024c 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -765,8 +765,9 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); } - /* state change interrupt */ - if (reg_esr & FLEXCAN_ESR_ERR_STATE) + /* state change interrupt or broken error state quirk fix is enabled */ + if ((reg_esr & FLEXCAN_ESR_ERR_STATE) || + (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_ERR_STATE)) flexcan_irq_state(dev, reg_esr); /* bus error IRQ - handle if bus error reporting is activated */ -- cgit v1.2.3 From 2f8639b24b4f4f9dd6cf7c1f2aea90e2fcbcc451 Mon Sep 17 00:00:00 2001 From: "ZHU Yi (ST-FIR/ENG1-Zhu)" Date: Fri, 15 Sep 2017 07:01:23 +0000 Subject: can: flexcan: rename legacy error state quirk Rename FLEXCAN_QUIRK_BROKEN_ERR_STATE to FLEXCAN_QUIRK_BROKEN_WERR_STATE for better description of the missing [TR]WRN_INT quirk. Signed-off-by: Zhu Yi Signed-off-by: Mark Jonas Acked-by: Wolfgang Grandegger Cc: linux-stable # >= v4.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index df4bfb83024c..e163c55e737b 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -193,7 +193,7 @@ * * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. */ -#define FLEXCAN_QUIRK_BROKEN_ERR_STATE BIT(1) /* [TR]WRN_INT not connected */ +#define FLEXCAN_QUIRK_BROKEN_WERR_STATE BIT(1) /* [TR]WRN_INT not connected */ #define FLEXCAN_QUIRK_DISABLE_RXFG BIT(2) /* Disable RX FIFO Global mask */ #define FLEXCAN_QUIRK_ENABLE_EACEN_RRS BIT(3) /* Enable EACEN and RRS bit in ctrl2 */ #define FLEXCAN_QUIRK_DISABLE_MECR BIT(4) /* Disable Memory error detection */ @@ -281,7 +281,7 @@ struct flexcan_priv { }; static const struct flexcan_devtype_data fsl_p1010_devtype_data = { - .quirks = FLEXCAN_QUIRK_BROKEN_ERR_STATE, + .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE, }; static const struct flexcan_devtype_data fsl_imx28_devtype_data; @@ -767,7 +767,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) /* state change interrupt or broken error state quirk fix is enabled */ if ((reg_esr & FLEXCAN_ESR_ERR_STATE) || - (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_ERR_STATE)) + (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE)) flexcan_irq_state(dev, reg_esr); /* bus error IRQ - handle if bus error reporting is activated */ @@ -888,7 +888,7 @@ static int flexcan_chip_start(struct net_device *dev) * on most Flexcan cores, too. Otherwise we don't get * any error warning or passive interrupts. */ - if (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_ERR_STATE || + if (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE || priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; else -- cgit v1.2.3 From da49a8075c00b4d98ef069a0ee201177a8b79ead Mon Sep 17 00:00:00 2001 From: "ZHU Yi (ST-FIR/ENG1-Zhu)" Date: Fri, 15 Sep 2017 07:03:58 +0000 Subject: can: flexcan: implement error passive state quirk Add FLEXCAN_QUIRK_BROKEN_PERR_STATE for better description of the missing error passive interrupt quirk. Error interrupt flooding may happen if the broken error state quirk fix is enabled. For example, in case there is singled out node on the bus and the node sends a frame, then error interrupt flooding happens and will not stop because the node cannot go to bus off. The flooding will stop after another node connected to the bus again. If high bitrate configured on the low end system, then the flooding may causes performance issue, hence, this patch mitigates this by: 1. disable error interrupt upon error passive state transition 2. re-enable error interrupt upon error warning state transition 3. disable/enable error interrupt upon error active state transition depends on FLEXCAN_QUIRK_BROKEN_WERR_STATE In this way, the driver is still able to report correct state transitions without additional latency. When there are bus problems, flooding of error interrupts is limited to the number of frames required to change state from error warning to error passive if the core has [TR]WRN_INT connected (FLEXCAN_QUIRK_BROKEN_WERR_STATE is not enabled), otherwise, the flooding is limited to the number of frames required to change state from error active to error passive. Signed-off-by: Zhu Yi Signed-off-by: Mark Jonas Acked-by: Wolfgang Grandegger Cc: linux-stable # >= v4.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 75 +++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 66 insertions(+), 9 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index e163c55e737b..c83a09fa4166 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -182,14 +182,14 @@ /* FLEXCAN hardware feature flags * * Below is some version info we got: - * SOC Version IP-Version Glitch- [TR]WRN_INT Memory err RTR re- - * Filter? connected? detection ception in MB - * MX25 FlexCAN2 03.00.00.00 no no no no - * MX28 FlexCAN2 03.00.04.00 yes yes no no - * MX35 FlexCAN2 03.00.00.00 no no no no - * MX53 FlexCAN2 03.00.00.00 yes no no no - * MX6s FlexCAN3 10.00.12.00 yes yes no yes - * VF610 FlexCAN3 ? no yes yes yes? + * SOC Version IP-Version Glitch- [TR]WRN_INT IRQ Err Memory err RTR re- + * Filter? connected? Passive detection ception in MB + * MX25 FlexCAN2 03.00.00.00 no no ? no no + * MX28 FlexCAN2 03.00.04.00 yes yes no no no + * MX35 FlexCAN2 03.00.00.00 no no ? no no + * MX53 FlexCAN2 03.00.00.00 yes no no no no + * MX6s FlexCAN3 10.00.12.00 yes yes no no yes + * VF610 FlexCAN3 ? no yes ? yes yes? * * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. */ @@ -198,6 +198,7 @@ #define FLEXCAN_QUIRK_ENABLE_EACEN_RRS BIT(3) /* Enable EACEN and RRS bit in ctrl2 */ #define FLEXCAN_QUIRK_DISABLE_MECR BIT(4) /* Disable Memory error detection */ #define FLEXCAN_QUIRK_USE_OFF_TIMESTAMP BIT(5) /* Use timestamp based offloading */ +#define FLEXCAN_QUIRK_BROKEN_PERR_STATE BIT(6) /* No interrupt for error passive */ /* Structure of the message buffer */ struct flexcan_mb { @@ -335,6 +336,22 @@ static inline void flexcan_write(u32 val, void __iomem *addr) } #endif +static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv) +{ + struct flexcan_regs __iomem *regs = priv->regs; + u32 reg_ctrl = (priv->reg_ctrl_default | FLEXCAN_CTRL_ERR_MSK); + + flexcan_write(reg_ctrl, ®s->ctrl); +} + +static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv) +{ + struct flexcan_regs __iomem *regs = priv->regs; + u32 reg_ctrl = (priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_MSK); + + flexcan_write(reg_ctrl, ®s->ctrl); +} + static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv) { if (!priv->reg_xceiver) @@ -713,6 +730,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) struct flexcan_regs __iomem *regs = priv->regs; irqreturn_t handled = IRQ_NONE; u32 reg_iflag1, reg_esr; + enum can_state last_state = priv->can.state; reg_iflag1 = flexcan_read(®s->iflag1); @@ -767,7 +785,8 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) /* state change interrupt or broken error state quirk fix is enabled */ if ((reg_esr & FLEXCAN_ESR_ERR_STATE) || - (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE)) + (priv->devtype_data->quirks & (FLEXCAN_QUIRK_BROKEN_WERR_STATE | + FLEXCAN_QUIRK_BROKEN_PERR_STATE))) flexcan_irq_state(dev, reg_esr); /* bus error IRQ - handle if bus error reporting is activated */ @@ -775,6 +794,44 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) flexcan_irq_bus_err(dev, reg_esr); + /* availability of error interrupt among state transitions in case + * bus error reporting is de-activated and + * FLEXCAN_QUIRK_BROKEN_PERR_STATE is enabled: + * +--------------------------------------------------------------+ + * | +----------------------------------------------+ [stopped / | + * | | | sleeping] -+ + * +-+-> active <-> warning <-> passive -> bus off -+ + * ___________^^^^^^^^^^^^_______________________________ + * disabled(1) enabled disabled + * + * (1): enabled if FLEXCAN_QUIRK_BROKEN_WERR_STATE is enabled + */ + if ((last_state != priv->can.state) && + (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_PERR_STATE) && + !(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { + switch (priv->can.state) { + case CAN_STATE_ERROR_ACTIVE: + if (priv->devtype_data->quirks & + FLEXCAN_QUIRK_BROKEN_WERR_STATE) + flexcan_error_irq_enable(priv); + else + flexcan_error_irq_disable(priv); + break; + + case CAN_STATE_ERROR_WARNING: + flexcan_error_irq_enable(priv); + break; + + case CAN_STATE_ERROR_PASSIVE: + case CAN_STATE_BUS_OFF: + flexcan_error_irq_disable(priv); + break; + + default: + break; + } + } + return handled; } -- cgit v1.2.3 From cf9c04677f2bf599b44511963039ec6e25583feb Mon Sep 17 00:00:00 2001 From: "ZHU Yi (ST-FIR/ENG1-Zhu)" Date: Fri, 15 Sep 2017 07:05:50 +0000 Subject: can: flexcan: fix i.MX6 state transition issue Enable FLEXCAN_QUIRK_BROKEN_PERR_STATE for i.MX6 to report correct state transitions. Signed-off-by: Zhu Yi Signed-off-by: Mark Jonas Acked-by: Wolfgang Grandegger Cc: linux-stable # >= v4.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index c83a09fa4166..d6ad12744ff1 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -289,7 +289,7 @@ static const struct flexcan_devtype_data fsl_imx28_devtype_data; static const struct flexcan_devtype_data fsl_imx6q_devtype_data = { .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS | - FLEXCAN_QUIRK_USE_OFF_TIMESTAMP, + FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_BROKEN_PERR_STATE, }; static const struct flexcan_devtype_data fsl_vf610_devtype_data = { -- cgit v1.2.3 From 083c5571290a2d4308b75f1a59cf376b6e907808 Mon Sep 17 00:00:00 2001 From: "ZHU Yi (ST-FIR/ENG1-Zhu)" Date: Fri, 15 Sep 2017 07:08:23 +0000 Subject: can: flexcan: fix i.MX28 state transition issue Enable FLEXCAN_QUIRK_BROKEN_PERR_STATE for i.MX28 to report correct state transitions, especially to error passive. Signed-off-by: Wolfgang Grandegger Signed-off-by: Zhu Yi Signed-off-by: Mark Jonas Cc: linux-stable # >= v4.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index d6ad12744ff1..ed544c44848f 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -285,7 +285,9 @@ static const struct flexcan_devtype_data fsl_p1010_devtype_data = { .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE, }; -static const struct flexcan_devtype_data fsl_imx28_devtype_data; +static const struct flexcan_devtype_data fsl_imx28_devtype_data = { + .quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE, +}; static const struct flexcan_devtype_data fsl_imx6q_devtype_data = { .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS | -- cgit v1.2.3 From fb5b91d61bebc24686ffc379138fd67808b1a1e6 Mon Sep 17 00:00:00 2001 From: "ZHU Yi (ST-FIR/ENG1-Zhu)" Date: Fri, 15 Sep 2017 07:09:37 +0000 Subject: can: flexcan: fix p1010 state transition issue Enable FLEXCAN_QUIRK_BROKEN_WERR_STATE and FLEXCAN_QUIRK_BROKEN_PERR_STATE for p1010 to report correct state transitions. Signed-off-by: Zhu Yi Signed-off-by: Mark Jonas Acked-by: Wolfgang Grandegger Cc: linux-stable # >= v4.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index ed544c44848f..a13a4896a8bd 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -282,7 +282,8 @@ struct flexcan_priv { }; static const struct flexcan_devtype_data fsl_p1010_devtype_data = { - .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE, + .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE | + FLEXCAN_QUIRK_BROKEN_PERR_STATE, }; static const struct flexcan_devtype_data fsl_imx28_devtype_data = { -- cgit v1.2.3 From 72d92e865d1560723e1957ee3f393688c49ca5bf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Stefan=20M=C3=A4tje?= Date: Wed, 18 Oct 2017 13:25:17 +0200 Subject: can: esd_usb2: Fix can_dlc value for received RTR, frames MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The dlc member of the struct rx_msg contains also the ESD_RTR flag to mark received RTR frames. Without the fix the can_dlc value for received RTR frames would always be set to 8 by get_can_dlc() instead of the received value. Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device") Signed-off-by: Stefan Mätje Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/usb/esd_usb2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c index be928ce62d32..9fdb0f0bfa06 100644 --- a/drivers/net/can/usb/esd_usb2.c +++ b/drivers/net/can/usb/esd_usb2.c @@ -333,7 +333,7 @@ static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, } cf->can_id = id & ESD_IDMASK; - cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); + cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR); if (id & ESD_EXTID) cf->can_id |= CAN_EFF_FLAG; -- cgit v1.2.3 From 97819f943063b622eca44d3644067c190dc75039 Mon Sep 17 00:00:00 2001 From: Wolfgang Grandegger Date: Thu, 14 Sep 2017 18:37:14 +0200 Subject: can: gs_usb: fix busy loop if no more TX context is available If sending messages with no cable connected, it quickly happens that there is no more TX context available. Then "gs_can_start_xmit()" returns with "NETDEV_TX_BUSY" and the upper layer does retry immediately keeping the CPU busy. To fix that issue, I moved "atomic_dec(&dev->active_tx_urbs)" from "gs_usb_xmit_callback()" to the TX done handling in "gs_usb_receive_bulk_callback()". Renaming "active_tx_urbs" to "active_tx_contexts" and moving it into "gs_[alloc|free]_tx_context()" would also make sense. Signed-off-by: Wolfgang Grandegger Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/usb/gs_usb.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index afcc1312dbaf..68ac3e88a8ce 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -375,6 +375,8 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) gs_free_tx_context(txc); + atomic_dec(&dev->active_tx_urbs); + netif_wake_queue(netdev); } @@ -463,14 +465,6 @@ static void gs_usb_xmit_callback(struct urb *urb) urb->transfer_buffer_length, urb->transfer_buffer, urb->transfer_dma); - - atomic_dec(&dev->active_tx_urbs); - - if (!netif_device_present(netdev)) - return; - - if (netif_queue_stopped(netdev)) - netif_wake_queue(netdev); } static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb, -- cgit v1.2.3