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can: m_can: fix CAN state in system PM

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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: e0d1f4816f ("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>
This commit is contained in:
Marc Kleine-Budde
2025-08-12 16:58:31 +02:00
parent 4942c42fe1
commit a9e30a22d6
1 changed files with 3 additions and 4 deletions
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7
drivers/net/can/m_can/m_can.c
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@@ -2503,12 +2503,11 @@ int m_can_class_suspend(struct device *dev)
}
m_can_clk_stop(cdev);
cdev->can.state = CAN_STATE_SLEEPING;
}
pinctrl_pm_select_sleep_state(dev);
cdev->can.state = CAN_STATE_SLEEPING;
return ret;
}
EXPORT_SYMBOL_GPL(m_can_class_suspend);
@@ -2521,8 +2520,6 @@ int m_can_class_resume(struct device *dev)
pinctrl_pm_select_default_state(dev);
cdev->can.state = CAN_STATE_ERROR_ACTIVE;
if (netif_running(ndev)) {
ret = m_can_clk_start(cdev);
if (ret)
@@ -2540,6 +2537,8 @@ int m_can_class_resume(struct device *dev)
if (cdev->ops->init)
ret = cdev->ops->init(cdev);
cdev->can.state = m_can_state_get_by_psr(cdev);
m_can_write(cdev, M_CAN_IE, cdev->active_interrupts);
} else {
ret = m_can_start(ndev);