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
