5.15-stable review patch. If anyone has any objections, please let me know.
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From: Haibo Chen haibo.chen@nxp.com
[ Upstream commit 5a19143124be42900b3fbc9ada3c919632eb45eb ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/flexcan.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index fc9cfe434ce4f..6f4e3e0330a45 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -2337,6 +2337,10 @@ 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; @@ -2369,10 +2373,16 @@ 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); }