[PATCH net 6/6] can: flexcan: disable transceiver during system PM
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: 2025-03-14 13:09:20
Also in:
linux-can, stable
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
From: Haibo Chen <haibo.chen@nxp.com>
During system PM, if no wakeup requirement, disable transceiver to
save power.
Fixes: 4de349e786a3 ("can: flexcan: fix resume function")
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <frank.li@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://patch.msgid.link/20250314110145.899179-2-haibo.chen@nxp.com
[mkl: add newlines]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
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