From: Haibo Chen <haibo.chen@xxxxxxx> During system PM, if no wakeup requirement, disable transceiver to save power. Fixes: 4de349e786a3 ("can: flexcan: fix resume function") Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Frank Li <frank.li@xxxxxxx> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx> Link: https://patch.msgid.link/20250314110145.899179-2-haibo.chen@xxxxxxx [mkl: add newlines] Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> --- drivers/net/can/flexcan/flexcan-core.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c index 3a71fd235722..b080740bcb10 100644 --- a/drivers/net/can/flexcan/flexcan-core.c +++ b/drivers/net/can/flexcan/flexcan-core.c @@ -2260,6 +2260,10 @@ static int __maybe_unused flexcan_suspend(struct device *device) flexcan_chip_interrupts_disable(dev); + err = flexcan_transceiver_disable(priv); + if (err) + return err; + err = pinctrl_pm_select_sleep_state(device); if (err) return err; @@ -2292,10 +2296,16 @@ static int __maybe_unused flexcan_resume(struct device *device) if (err) return err; - err = flexcan_chip_start(dev); + err = flexcan_transceiver_enable(priv); if (err) return err; + err = flexcan_chip_start(dev); + if (err) { + flexcan_transceiver_disable(priv); + return err; + } + flexcan_chip_interrupts_enable(dev); } -- 2.47.2