can: flexcan: disable transceiver during system PM

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>

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 3a71fd2357222f4cdcf230102829d117faf5a486..b080740bcb104f028808e8db38c6aaef1da90e69 100644 (file)
--- 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);
                }