From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, linux-can@vger.kernel.org,
kernel@pengutronix.de,
Jeroen Hofstee <jhofstee@victronenergy.com>,
Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 22/33] can: ti_hecc: ti_hecc_stop(): stop the CPK on down
Date: Tue, 5 Nov 2019 17:32:04 +0100 [thread overview]
Message-ID: <20191105163215.30194-23-mkl@pengutronix.de> (raw)
In-Reply-To: <20191105163215.30194-1-mkl@pengutronix.de>
From: Jeroen Hofstee <jhofstee@victronenergy.com>
When the interface goes down, the CPK should no longer take an active
part in the CAN-bus communication, like sending acks and error frames.
So enable configuration mode in ti_hecc_stop, so the CPK is no longer
active.
When a transceiver switch is present the acks and errors don't make it
to the bus, but disabling the CPK then does prevent oddities, like
ti_hecc_reset() failing, since the CPK can become bus-off and starts
counting the 11 bit recessive bits, which seems to block the reset. It
can also cause invalid interrupts and disrupt the CAN-bus, since
transmission can be stopped in the middle of a message, by disabling the
tranceiver while the CPK is sending.
Since the CPK is disabled after normal power on, it is typically only
seen when the interface is restarted.
Signed-off-by: Jeroen Hofstee <jhofstee@victronenergy.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
drivers/net/can/ti_hecc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 91188e6d4f78..eb8151154083 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -400,6 +400,9 @@ static void ti_hecc_stop(struct net_device *ndev)
{
struct ti_hecc_priv *priv = netdev_priv(ndev);
+ /* Disable the CPK; stop sending, erroring and acking */
+ hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_CCR);
+
/* Disable interrupts and disable mailboxes */
hecc_write(priv, HECC_CANGIM, 0);
hecc_write(priv, HECC_CANMIM, 0);
--
2.24.0.rc1
next prev parent reply other threads:[~2019-11-05 16:33 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-05 16:31 pull-request: can 2019-11-05 Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 01/33] can: dev: add missing of_node_put() after calling of_get_child_by_name() Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 02/33] can: gs_usb: gs_can_open(): prevent memory leak Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 03/33] can: mcba_usb: fix use-after-free on disconnect Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 04/33] can: usb_8dev: " Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 05/33] can: flexcan: disable completely the ECC mechanism Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 06/33] can: peak_usb: fix a potential out-of-sync while decoding packets Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 07/33] can: peak_usb: fix slab info leak Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 08/33] can: peak_usb: report bus recovery as well Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 09/33] can: c_can: c_can_poll(): only read status register after status IRQ Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 10/33] can: c_can: D_CAN: c_can_chip_config(): perform a sofware reset on open Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 11/33] can: c_can: C_CAN: add bus recovery events Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 12/33] can: xilinx_can: Fix flags field initialization for axi can Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 13/33] can: rx-offload: can_rx_offload_queue_sorted(): fix error handling, avoid skb mem leak Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 14/33] can: rx-offload: can_rx_offload_queue_tail(): " Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 15/33] can: rx-offload: can_rx_offload_offload_one(): do not increase the skb_queue beyond skb_queue_len_max Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 16/33] can: rx-offload: can_rx_offload_offload_one(): increment rx_fifo_errors on queue overflow or OOM Marc Kleine-Budde
2019-11-05 16:31 ` [PATCH 17/33] can: rx-offload: can_rx_offload_offload_one(): use ERR_PTR() to propagate error value in case of errors Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 18/33] can: rx-offload: can_rx_offload_irq_offload_timestamp(): continue on error Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 19/33] can: rx-offload: can_rx_offload_irq_offload_fifo(): " Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 20/33] can: flexcan: increase error counters if skb enqueueing via can_rx_offload_queue_sorted() fails Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 21/33] can: ti_hecc: ti_hecc_error(): " Marc Kleine-Budde
2019-11-05 16:32 ` Marc Kleine-Budde [this message]
2019-11-05 16:32 ` [PATCH 23/33] can: ti_hecc: keep MIM and MD set Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 24/33] can: ti_hecc: release the mailbox a bit earlier Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 25/33] can: ti_hecc: add fifo overflow error reporting Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 26/33] can: ti_hecc: properly report state changes Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 27/33] can: ti_hecc: add missing " Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 28/33] can: j1939: fix resource leak of skb on error return paths Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 29/33] can: j1939: fix memory leak if filters was set Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 30/33] can: j1939: transport: j1939_session_fresh_new(): make sure EOMA is send with the total message size set Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 31/33] can: j1939: transport: j1939_xtp_rx_eoma_one(): Add sanity check for correct total message size Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 32/33] can: mcp251x: mcp251x_restart_work_handler(): Fix potential force_quit race condition Marc Kleine-Budde
2019-11-05 16:32 ` [PATCH 33/33] can: don't use deprecated license identifiers Marc Kleine-Budde
2019-11-05 21:30 ` pull-request: can 2019-11-05 David Miller
2019-11-05 21:36 ` Marc Kleine-Budde
2019-11-07 8:45 ` request: merge net/master into net-next/master Marc Kleine-Budde
2019-11-09 20:28 ` request: merge net/master into net-next/master,request: " David Miller
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