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is down
If the interface is down, the CAN controller might be powered down, the
clock disabled, and/or it's external reset asserted.
Don't wake up the controller to read the CAN bus error counters, if the
interface is down.
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-7-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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m_can_tx_submit() is only called for peripheral devices. So remove the
sanity check.
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-6-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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devm_kzalloc() fails
If devm_kzalloc() fails, it already outputs an error message. Remove the
error message from m_can_class_register() accordingly.
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-5-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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coding it
As everywhere else in the driver, use m_can_write() instead of open coding
it.
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-4-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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To ease debugging use the netdev_{dbg,info,err}() functions instead of
dev_{dbg,info,err}.
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-3-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The original use of struct m_can_classdev::hrtimer was to support polling
for devices without IRQ, with the timer function called hrtimer_callback().
Commit 07f25091ca02 ("can: m_can: Implement receive coalescing") uses the
hrtimer for software-supported IRQ coalescence, with the timer function
called m_can_coalescing_timer().
To improve the readability of the driver, rename hrtimer_callback() to
m_can_polling_timer(), which better describes the functionality.
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-2-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Since commit eaacfeaca7ad ("can: m_can: Call the RAM init directly from
m_can_chip_config") m_can_init_ram() is not used outside of m_can.c.
Mark as static and remove the EXPORT_SYMBOL_GPL().
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-1-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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TI AM62x SoC requires a wakeup flag being set in pinctrl when mcan pins
act as a wakeup source. Add support to select the wakeup state if WOL
is enabled.
Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
Link: https://patch.msgid.link/20251001-topic-mcan-wakeup-source-v6-12-v10-4-4ab508ac5d1e@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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We have more detailed error values available, return them in the core
driver and the calling drivers to return proper errors to callers.
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Kendall Willis <k-willis@ti.com>
Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
Link: https://patch.msgid.link/20251001-topic-mcan-wakeup-source-v6-12-v10-3-4ab508ac5d1e@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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In some devices the pins of the m_can module can act as a wakeup source.
This patch helps do that by connecting the PHY_WAKE WoL option to
device_set_wakeup_enable. By marking this device as being wakeup
enabled, this setting can be used by platform code to decide which
sleep or poweroff mode to use.
Also this prepares the driver for the next patch in which the pinctrl
settings are changed depending on the desired wakeup source.
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Reviewed-by: Kendall Willis <k-willis@ti.com>
Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
Link: https://patch.msgid.link/20251001-topic-mcan-wakeup-source-v6-12-v10-2-4ab508ac5d1e@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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can_change_mtu() became obsolete by commit 23049938605b ("can: populate the
minimum and maximum MTU values"). Now that net_device->min_mtu and
net_device->max_mtu are populated, all the checks are already done by
dev_validate_mtu() in net/core/dev.c.
Remove the net_device_ops->ndo_change_mtu() callback of all the physical
interfaces, then remove can_change_mtu(). Only keep the vcan_change_mtu()
and vxcan_change_mtu() because the virtual interfaces use their own
different MTU logic.
The only functional change this patch introduces is that now the user will
be able to change the MTU even if the interface is up. This does not matter
for Classical CAN and CAN FD because their MTU range is composed of only
one value, respectively CAN_MTU and CANFD_MTU. For the upcoming CAN XL, the
MTU will be configurable within the CANXL_MIN_MTU to CANXL_MAX_MTU range at
any time, even if the interface is up. This is consistent with the other
net protocols and does not contradict ISO 11898-1:2024 as having a
modifiable MTU is a kernel extension.
Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Link: https://patch.msgid.link/20251003-remove-can_change_mtu-v1-1-337f8bc21181@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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This patch has been split from the original series [1].
In some SoCs (observed on the STM32MP15) the M_CAN IP core keeps the CAN
state and CAN error counters over an internal reset cycle. The STM32MP15
SoC provides an external reset, which is shared between both M_CAN cores.
Add support for an optional external reset. Take care of shared resets,
de-assert reset during the probe phase in m_can_class_register() and while
the interface is up, assert the reset otherwise.
[1] https://lore.kernel.org/all/20250923-m_can-fix-state-handling-v3-0-06d8baccadbf@pengutronix.de
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20251008-m_can-add-reset-v1-1-49f0bbf820c4@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Dong Aisheng's old Freescale email is not valid anymore and bounces,
replace it by the new NXP one.
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Link: https://patch.msgid.link/20251009-m_can-update-email-address-v1-1-30a268587f69@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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A suspend/resume cycle on a down interface results in the interface
coming up in Error Active state. A suspend/resume cycle on an Up
interface will always result in Error Active state, regardless of the
actual CAN state.
During suspend, only set running interfaces to CAN_STATE_SLEEPING.
During resume only touch the CAN state of running interfaces. For
wakeup sources, set the CAN state depending on the Protocol Status
Regitser (PSR), for non wakeup source interfaces m_can_start() will do
the same.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20250929-m_can-fix-state-handling-v4-4-682b49b49d9a@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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In some SoCs (observed on the STM32MP15) the M_CAN IP core keeps the
CAN state and CAN error counters over an internal reset cycle. An
external reset is not always possible, due to the shared reset with
the other CAN core. This caused the core not always be in Error Active
state when bringing up the controller.
Instead of always setting the CAN state to Error Active in
m_can_chip_config(), fix this by reading and decoding the Protocol
Status Regitser (PSR) and set the CAN state accordingly.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20250929-m_can-fix-state-handling-v4-3-682b49b49d9a@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Active
The CAN Error State is determined by the receive and transmit error
counters. The CAN error counters decrease when reception/transmission
is successful, so that a status transition back to the Error Active
status is possible. This transition is not handled by
m_can_handle_state_errors().
Add the missing detection of the Error Active state to
m_can_handle_state_errors() and extend the handling of this state in
m_can_handle_state_change().
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Fixes: cd0d83eab2e0 ("can: m_can: m_can_handle_state_change(): fix state change")
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20250929-m_can-fix-state-handling-v4-2-682b49b49d9a@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Commit 227619c3ff7c ("can: m_can: move runtime PM enable/disable to
m_can_platform") moved the PM runtime enable from the m_can core
driver into the m_can_platform.
That patch forgot to move the pm_runtime_disable() to
m_can_plat_remove(), so that unloading the m_can_platform driver
causes an "Unbalanced pm_runtime_enable!" error message.
Add the missing pm_runtime_disable() to m_can_plat_remove() to fix the
problem.
Cc: Patrik Flykt <patrik.flykt@linux.intel.com>
Fixes: 227619c3ff7c ("can: m_can: move runtime PM enable/disable to m_can_platform")
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20250929-m_can-fix-state-handling-v4-1-682b49b49d9a@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The tx_coalesce_usecs_irq are more suitable for using the
us_to_ktime(). This can make the code more concise and
enhance readability.
Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: Vincent Mailhol <mailhol@kernel.org>
Link: https://patch.msgid.link/20250825090904.248927-1-zhao.xichao@vivo.com
[mkl: remove not needed line break]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Fixes reset GPIO usage during probe by ensuring we retrieve the GPIO and
take the device out of reset (if it defaults to being in reset) before
we attempt to communicate with the device. This is achieved by moving
the call to tcan4x5x_get_gpios() before tcan4x5x_find_version() and
avoiding any device communication while getting the GPIOs. Once we
determine the version, we can then take the knowledge of which GPIOs we
obtained and use it to decide whether we need to disable the wake or
state pin functions within the device.
This change is necessary in a situation where the reset GPIO is pulled
high externally before the CPU takes control of it, meaning we need to
explicitly bring the device out of reset before we can start
communicating with it at all.
This also has the effect of fixing an issue where a reset of the device
would occur after having called tcan4x5x_disable_wake(), making the
original behavior not actually disable the wake. This patch should now
disable wake or state pin functions well after the reset occurs.
Signed-off-by: Brett Werling <brett.werling@garmin.com>
Link: https://patch.msgid.link/20250711141728.1826073-1-brett.werling@garmin.com
Cc: Markus Schneider-Pargmann <msp@baylibre.com>
Fixes: 142c6dc6d9d7 ("can: tcan4x5x: Add support for tcan4552/4553")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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debug level
Downgrade the "msg lost in rx" message to debug level, to prevent
flooding the kernel log with error messages.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20250711-mcan_ratelimit-v3-1-7413e8e21b84@geanix.com
[mkl: enhance commit message]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Fixes the power regulator retrieval in tcan4x5x_can_probe() by ensuring
the regulator pointer is not set to NULL in the successful return from
devm_regulator_get_optional().
Fixes: 3814ca3a10be ("can: tcan4x5x: tcan4x5x_can_probe(): turn on the power before parsing the config")
Signed-off-by: Brett Werling <brett.werling@garmin.com>
Link: https://patch.msgid.link/20250612191825.3646364-1-brett.werling@garmin.com
Cc: stable@vger.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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This is a preparation patch for the introduction of CAN XL.
CAN FD and CAN XL uses similar bittiming parameters. Add one level of
nesting for all the CAN FD parameters. Typically:
priv->can.data_bittiming;
becomes:
priv->can.fd.data_bittiming;
This way, the CAN XL equivalent (to be introduced later) would be:
priv->can.xl.data_bittiming;
Add the new struct data_bittiming_params which contains all the data
bittiming parameters, including the TDC and the callback functions.
This done, update all the CAN FD drivers to make use of the new
layout.
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20250501171213.2161572-2-mailhol.vincent@wanadoo.fr
[mkl: fix rcar_canfd]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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If a driver is removed, the driver framework invokes the driver's
remove callback. A CAN driver's remove function calls
unregister_candev(), which calls net_device_ops::ndo_stop further down
in the call stack for interfaces which are in the "up" state.
The removal of the module causes a warning, as can_rx_offload_del()
deletes the NAPI, while it is still active, because the interface is
still up.
To fix the warning, first unregister the network interface, which
calls net_device_ops::ndo_stop, which disables the NAPI, and then call
can_rx_offload_del().
Fixes: 1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250502-can-rx-offload-del-v1-3-59a9b131589d@pengutronix.de
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The spin lock tx_handling_spinlock in struct m_can_classdev is not
being initialized. This leads the following spinlock bad magic
complaint from the kernel, eg. when trying to send CAN frames with
cansend from can-utils:
| BUG: spinlock bad magic on CPU#0, cansend/95
| lock: 0xff60000002ec1010, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
| CPU: 0 UID: 0 PID: 95 Comm: cansend Not tainted 6.15.0-rc3-00032-ga79be02bba5c #5 NONE
| Hardware name: MachineWare SIM-V (DT)
| Call Trace:
| [<ffffffff800133e0>] dump_backtrace+0x1c/0x24
| [<ffffffff800022f2>] show_stack+0x28/0x34
| [<ffffffff8000de3e>] dump_stack_lvl+0x4a/0x68
| [<ffffffff8000de70>] dump_stack+0x14/0x1c
| [<ffffffff80003134>] spin_dump+0x62/0x6e
| [<ffffffff800883ba>] do_raw_spin_lock+0xd0/0x142
| [<ffffffff807a6fcc>] _raw_spin_lock_irqsave+0x20/0x2c
| [<ffffffff80536dba>] m_can_start_xmit+0x90/0x34a
| [<ffffffff806148b0>] dev_hard_start_xmit+0xa6/0xee
| [<ffffffff8065b730>] sch_direct_xmit+0x114/0x292
| [<ffffffff80614e2a>] __dev_queue_xmit+0x3b0/0xaa8
| [<ffffffff8073b8fa>] can_send+0xc6/0x242
| [<ffffffff8073d1c0>] raw_sendmsg+0x1a8/0x36c
| [<ffffffff805ebf06>] sock_write_iter+0x9a/0xee
| [<ffffffff801d06ea>] vfs_write+0x184/0x3a6
| [<ffffffff801d0a88>] ksys_write+0xa0/0xc0
| [<ffffffff801d0abc>] __riscv_sys_write+0x14/0x1c
| [<ffffffff8079ebf8>] do_trap_ecall_u+0x168/0x212
| [<ffffffff807a830a>] handle_exception+0x146/0x152
Initializing the spin lock in m_can_class_allocate_dev solves that
problem.
Fixes: 1fa80e23c150 ("can: m_can: Introduce a tx_fifo_in_flight counter")
Signed-off-by: Antonios Salios <antonios@mwa.re>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20250425111744.37604-2-antonios@mwa.re
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely.
Replace hrtimer_init() and the open coded initialization of
hrtimer::function with the new setup mechanism.
Patch was created by using Coccinelle.
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/all/f1a87fcba211f6ce262a2d23fd152185f452c32d.1738746872.git.namcao@linutronix.de
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git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next
Marc Kleine-Budde says:
====================
pull-request: can-next 2025-01-10
Pierre-Henry Moussay adds PIC64GX compatibility to the DT bindings for
Microchip's mpfs-can IP core.
The next 3 patches are by Sean Nyekjaer and target the tcan4x5x
driver. First the DT bindings is converted to DT schema, then nWKRQ
voltage selection is added to the driver.
Dario Binacchi's patch for the sun4i_can makes the driver more
consistent by adding a likely() to the driver.
Another patch by Sean Nyekjaer for the tcan4x5x driver gets rid of a
false error message.
Charan Pedumuru converts the atmel-can DT bindings to DT schema.
The next 2 patches are by Oliver Hartkopp. The first one maps Oliver's
former mail addresses to a dedicated CAN mail address. The second one
assigns net/sched/em_canid.c additionally to the CAN maintainers.
Ariel Otilibili's patch removes dead code from the CAN dev helper.
The next 3 patches are by Sean Nyekjaer and add HW standby support to
the tcan4x5x driver.
A patch by Dario Binacchi fixes the DT bindings for the st,stm32-bxcan
driver.
The last 4 patches are by Jimmy Assarsson and target the kvaser_usb
and the kvaser_pciefd driver: error statistics are improved and
CAN_CTRLMODE_BERR_REPORTING is added.
* tag 'linux-can-next-for-6.14-20250110' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next:
can: kvaser_pciefd: Add support for CAN_CTRLMODE_BERR_REPORTING
can: kvaser_pciefd: Update stats and state even if alloc_can_err_skb() fails
can: kvaser_usb: Add support for CAN_CTRLMODE_BERR_REPORTING
can: kvaser_usb: Update stats and state even if alloc_can_err_skb() fails
dt-bindings: can: st,stm32-bxcan: fix st,gcan property type
can: m_can: call deinit/init callback when going into suspend/resume
can: tcan4x5x: add deinit callback to set standby mode
can: m_can: add deinit callback
can: dev: can_get_state_str(): Remove dead code
MAINTAINERS: assign em_canid.c additionally to CAN maintainers
mailmap: add an entry for Oliver Hartkopp
dt-bindings: net: can: atmel: Convert to json schema
can: tcan4x5x: get rid of false clock errors
can: sun4i_can: continue to use likely() to check skb
can: tcan4x5x: add option for selecting nWKRQ voltage
dt-bindings: can: tcan4x5x: Document the ti,nwkrq-voltage-vio option
dt-bindings: can: convert tcan4x5x.txt to DT schema
dt-bindings: can: mpfs: add PIC64GX CAN compatibility
====================
Link: https://patch.msgid.link/20250110112712.3214173-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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m_can user like the tcan4x5x device, can go into standby mode.
Low power RX mode is enabled to allow wake on can.
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20241122-tcan-standby-v3-3-90bafaf5eccd@geanix.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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At Vsup 12V, standby mode will save 7-8mA, when the interface is
down.
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20241122-tcan-standby-v3-2-90bafaf5eccd@geanix.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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This is added in preparation for calling standby mode in the tcan4x5x
driver or other users of m_can.
For the tcan4x5x; If Vsup 12V, standby mode will save 7-8mA, when the
interface is down.
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20241122-tcan-standby-v3-1-90bafaf5eccd@geanix.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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tcan4x5x devices only requires the clock "cclk", so call
devm_clk_get() directly. This is done to avoid
m_can_class_get_clocks() that checks for both hclk and cclk and
results in this warning message:
| tcan4x5x spi0.0: no clock found
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20241128-mcancclk-v1-1-a93aac64dbae@geanix.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The nWKRQ pin supports an output voltage of either the internal reference
voltage (3.6V) or the reference voltage of
the digital interface 0-6V (VIO).
Add the devicetree option ti,nwkrq-voltage-vio to set it to VIO.
If this property is omitted the reset default, the internal reference
voltage, is used.
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Reviewed-by: Marc Kleine-Budde <mkl@pengutronix.de>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20241114-tcan-wkrqv-v5-2-a2d50833ed71@geanix.com
[mkl: remove unused variable in tcan4x5x_get_dt_data()]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The interrupt line of PCI devices is interpreted as edge-triggered,
however the interrupt signal of the m_can controller integrated in Intel
Elkhart Lake CPUs appears to be generated level-triggered.
Consider the following sequence of events:
- IR register is read, interrupt X is set
- A new interrupt Y is triggered in the m_can controller
- IR register is written to acknowledge interrupt X. Y remains set in IR
As at no point in this sequence no interrupt flag is set in IR, the
m_can interrupt line will never become deasserted, and no edge will ever
be observed to trigger another run of the ISR. This was observed to
result in the TX queue of the EHL m_can to get stuck under high load,
because frames were queued to the hardware in m_can_start_xmit(), but
m_can_finish_tx() was never run to account for their successful
transmission.
On an Elkhart Lake based board with the two CAN interfaces connected to
each other, the following script can reproduce the issue:
ip link set can0 up type can bitrate 1000000
ip link set can1 up type can bitrate 1000000
cangen can0 -g 2 -I 000 -L 8 &
cangen can0 -g 2 -I 001 -L 8 &
cangen can0 -g 2 -I 002 -L 8 &
cangen can0 -g 2 -I 003 -L 8 &
cangen can0 -g 2 -I 004 -L 8 &
cangen can0 -g 2 -I 005 -L 8 &
cangen can0 -g 2 -I 006 -L 8 &
cangen can0 -g 2 -I 007 -L 8 &
cangen can1 -g 2 -I 100 -L 8 &
cangen can1 -g 2 -I 101 -L 8 &
cangen can1 -g 2 -I 102 -L 8 &
cangen can1 -g 2 -I 103 -L 8 &
cangen can1 -g 2 -I 104 -L 8 &
cangen can1 -g 2 -I 105 -L 8 &
cangen can1 -g 2 -I 106 -L 8 &
cangen can1 -g 2 -I 107 -L 8 &
stress-ng --matrix 0 &
To fix the issue, repeatedly read and acknowledge interrupts at the
start of the ISR until no interrupt flags are set, so the next incoming
interrupt will also result in an edge on the interrupt line.
While we have received a report that even with this patch, the TX queue
can become stuck under certain (currently unknown) circumstances on the
Elkhart Lake, this patch completely fixes the issue with the above
reproducer, and it is unclear whether the remaining issue has a similar
cause at all.
Fixes: cab7ffc0324f ("can: m_can: add PCI glue driver for Intel Elkhart Lake")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/fdf0439c51bcb3a46c21e9fb21c7f1d06363be84.1728288535.git.matthias.schiffer@ew.tq-group.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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While an m_can controller usually already has the init flag from a
hardware reset, no such reset happens on the integrated m_can_pci of the
Intel Elkhart Lake. If the CAN controller is found in an active state,
m_can_dev_setup() would fail because m_can_niso_supported() calls
m_can_cccr_update_bits(), which refuses to modify any other configuration
bits when CCCR_INIT is not set.
To avoid this issue, set CCCR_INIT before attempting to modify any other
configuration flags.
Fixes: cd5a46ce6fa6 ("can: m_can: don't enable transceiver when probing")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/e247f331cb72829fcbdfda74f31a59cbad1a6006.1728288535.git.matthias.schiffer@ew.tq-group.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The m_can_handle_lec_err() function was incorrectly incrementing only the
receive error counter, even in cases of bit or acknowledgment errors that
occur during transmission.
Fix the issue by incrementing the appropriate counter based on the
type of error.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://patch.msgid.link/20241122221650.633981-7-dario.binacchi@amarulasolutions.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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In commit b382380c0d2d ("can: m_can: Add hrtimer to generate software
interrupt") support for IRQ-less devices was added. Instead of an
interrupt, the interrupt routine is called by a hrtimer-based polling
loop.
That patch forgot to change free_irq() to be only called for devices
with IRQs. Fix this, by calling free_irq() conditionally only if an
IRQ is available for the device (and thus has been requested
previously).
Fixes: b382380c0d2d ("can: m_can: Add hrtimer to generate software interrupt")
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20240930-m_can-cleanups-v1-1-001c579cdee4@pengutronix.de
Cc: <stable@vger.kernel.org> # v6.6+
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Merge in late fixes to prepare for the 6.12 net-next PR.
No conflicts or adjacent changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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After calling m_can_stop() an interrupt may be pending or NAPI might
still be executed. This means the driver might still touch registers
of the IP core after the clocks have been disabled. This is not good
practice and might lead to aborts depending on the SoC integration.
To avoid these potential problems, make m_can_close() symmetric to
m_can_open(), i.e. stop the clocks at the end, right before shutting
down the transceiver.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Link: https://patch.msgid.link/20240910-can-m_can-fix-ifup-v3-2-6c1720ba45ce@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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If an interrupt (RX-complete or error flag) is set when bringing up
the CAN device, e.g. due to CAN bus traffic before initializing the
device, when m_can_start() is called and interrupts are enabled,
m_can_isr() is called immediately, which disables all CAN interrupts
and calls napi_schedule().
Because napi_enable() isn't called until later in m_can_open(), the
call to napi_schedule() never schedules the m_can_poll() callback and
the device is left with interrupts disabled and can't receive any CAN
packets until rebooted.
This can be verified by running "cansend" from another device before
setting the bitrate and calling "ip link set up can0" on the test
device. Adding debug lines to m_can_isr() shows it's called with flags
(IR_EP | IR_EW | IR_CRCE), which calls m_can_disable_all_interrupts()
and napi_schedule(), and then m_can_poll() is never called.
Move the call to napi_enable() above the call to m_can_start() to
enable any initial interrupt flags to be handled by m_can_poll() so
that interrupts are reenabled. Add a call to napi_disable() in the
error handling section of m_can_open(), to handle the case where later
functions return errors.
Also, in m_can_close(), move the call to napi_disable() below the call
to m_can_stop() to ensure all interrupts are handled when bringing
down the device. This race condition is much less likely to occur.
Tested on a Microchip SAMA7G54 MPU. The fix should be applicable to
any SoC with a Bosch M_CAN controller.
Signed-off-by: Jake Hamby <Jake.Hamby@Teledyne.com>
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Link: https://patch.msgid.link/20240910-can-m_can-fix-ifup-v3-1-6c1720ba45ce@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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On the Microchip SAMA7G54 MPU the IR_TSW (timestamp wraparound) fires
at about 1 Hz, but the driver doesn't care about it. Add it to the
list of interrupts to disable in m_can_chip_config to reduce unneeded
wakeups.
Link: https://patch.msgid.link/DM8PR14MB5221D9DD3A7F2130EF161AF7EF9E2@DM8PR14MB5221.namprd14.prod.outlook.com
Signed-off-by: Jake Hamby <Jake.Hamby@Teledyne.com>
Link: https://patch.msgid.link/20240911-can-m_can-mask-timestamp-wraparound-irq-v1-1-0155b70dc827@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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After commit 0edb555a65d1 ("platform: Make platform_driver::remove()
return void") .remove() is (again) the right callback to implement for
platform drivers.
Convert all can drivers to use .remove(), with the eventual goal to drop
struct platform_driver::remove_new(). As .remove() and .remove_new() have
the same prototypes, conversion is done by just changing the structure
member name in the driver initializer.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/20240909072742.381003-2-u.kleine-koenig@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The use of coalescing for non-peripheral chips in the current
implementation is limited to non-existing. Disable the possibility to
set coalescing through ethtool.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-8-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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To force writing the enabled interrupts, reset the active_interrupts
cache.
Fixes: 07f25091ca02 ("can: m_can: Implement receive coalescing")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-7-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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active_interrupts is a cache for the enabled interrupts and not the
global masking of interrupts. Do not clear this variable otherwise we
may loose the state of the interrupts.
Fixes: 07f25091ca02 ("can: m_can: Implement receive coalescing")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-6-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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On setups without interrupts, the interrupt handler is called from a
timer callback. For non-peripheral receives napi is scheduled,
interrupts are disabled and the timer is canceled with a blocking call.
In case of an error this can happen as well.
Check if napi is scheduled in the timer callback after the interrupt
handler executed. If napi is scheduled, the timer is disabled. It will
be reenabled by m_can_poll().
Return error values from the interrupt handler so that interrupt threads
and timer callback can deal differently with it. In case of the timer
we only disable the timer. The rest will be done when stopping the
interface.
Fixes: b382380c0d2d ("can: m_can: Add hrtimer to generate software interrupt")
Fixes: a163c5761019 ("can: m_can: Start/Cancel polling timer together with interrupts")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-5-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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m_can_rx_peripheral() is a wrapper around m_can_rx_handler() that calls
m_can_disable_all_interrupts() on error. The same handling for the same
error path is done in m_can_isr() as well.
So remove m_can_rx_peripheral() and do the call from m_can_isr()
directly.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-4-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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We don't need to disable coalescing when the interrupt handler executes
while the chip is suspended. The coalescing is already reset during
suspend.
Fixes: 07f25091ca02 ("can: m_can: Implement receive coalescing")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-3-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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During resume the interrupts are limited to IR_RF0N and the chip keeps
running. In this case if coalescing is enabled and active we may miss
waterlevel interrupts during suspend. It is safer to reset the
coalescing by stopping the timer and adding IR_RF0N | IR_TEFN to the
interrupts.
This is a theoratical issue and probably extremely rare.
Cc: Martin Hundebøll <martin@geanix.com>
Fixes: 4a94d7e31cf5 ("can: m_can: allow keeping the transceiver running in suspend")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240805183047.305630-2-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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It appears that the irq requested in m_can_open() may be leaked
if an error subsequently occurs: if m_can_start() fails.
Address this by calling free_irq in the unwind path for
such cases.
Flagged by Smatch.
Compile tested only.
Fixes: eaacfeaca7ad ("can: m_can: Call the RAM init directly from m_can_chip_config")
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/all/20240805-mcan-irq-v2-1-7154c0484819@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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'struct m_can_ops' is not modified in these drivers.
Constifying this structure moves some data to a read-only section, so
increase overall security.
On a x86_64, with allmodconfig, as an example:
Before:
======
text data bss dec hex filename
4806 520 0 5326 14ce drivers/net/can/m_can/m_can_pci.o
After:
=====
text data bss dec hex filename
4862 464 0 5326 14ce drivers/net/can/m_can/m_can_pci.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/all/a17b96d1be5341c11f263e1e45c9de1cb754e416.1719172843.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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The m_can driver sets and clears the CCCR.INIT bit during probe (both
when testing the NON-ISO bit, and when configuring the chip). After
clearing the CCCR.INIT bit, the transceiver enters normal mode, where it
affects the CAN bus (i.e. it ACKs frames). This can cause troubles when
the m_can node is only used for monitoring the bus, as one cannot setup
listen-only mode before the device is probed.
Rework the probe flow, so that the CCCR.INIT bit is only cleared when
upping the device. First, the tcan4x5x driver is changed to stay in
standby mode during/after probe. This in turn requires changes when
setting bits in the CCCR register, as its CSR and CSA bits are always
high in standby mode.
Signed-off-by: Martin Hundebøll <martin@geanix.com>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Tested-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20240607105210.155435-1-martin@geanix.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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