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 Link: https://patch.msgid.link/20250929-m_can-fix-state-handling-v4-3-682b49b49d9a@pengutronix.de Signed-off-by: Marc Kleine-Budde --- drivers/net/can/m_can/m_can.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index ac864183a536..b6db5b57241c 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1617,7 +1617,7 @@ static int m_can_start(struct net_device *dev) netdev_queue_set_dql_min_limit(netdev_get_tx_queue(cdev->net, 0), cdev->tx_max_coalesced_frames); - cdev->can.state = CAN_STATE_ERROR_ACTIVE; + cdev->can.state = m_can_state_get_by_psr(cdev); m_can_enable_all_interrupts(cdev); -- 2.51.0