linux-kernel - [PATCH] can: flexcan: disable transceiver during system PM

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Message-Id: <20250304033731.1762899-1-haibo.chen@nxp.com>
Date: Tue,  4 Mar 2025 11:37:31 +0800
From: haibo.chen@....com
To: mkl@...gutronix.de,
	mailhol.vincent@...adoo.fr
Cc: ciprianmarian.costea@....nxp.com,
	haibo.chen@....com,
	u.kleine-koenig@...libre.com,
	linux-can@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: [PATCH] can: flexcan: disable transceiver during system PM

From: Haibo Chen <haibo.chen@....com>

During system PM, if no wakeup requirement, disable transceiver to
save power.

Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/net/can/flexcan/flexcan-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index b347a1c93536..74f3137295fb 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -2292,6 +2292,7 @@ static int __maybe_unused flexcan_suspend(struct device *device)
 				return err;
 
 			flexcan_chip_interrupts_disable(dev);
+			flexcan_transceiver_disable(priv);
 
 			err = pinctrl_pm_select_sleep_state(device);
 			if (err)
@@ -2325,6 +2326,10 @@ static int __maybe_unused flexcan_resume(struct device *device)
 			if (err)
 				return err;
 
+			err = flexcan_transceiver_enable(priv);
+			if (err)
+				return err;
+
 			err = flexcan_chip_start(dev);
 			if (err)
 				return err;
-- 
2.34.1