[PATCH net 7/7] can: rcar_can: rcar_can_resume(): fix s2ram with PSCI
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: 2025-09-10 16:29:17
Also in:
linux-can
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
From: Geert Uytterhoeven <geert+renesas@glider.be> On R-Car Gen3 using PSCI, s2ram powers down the SoC. After resume, the CAN interface no longer works, until it is brought down and up again. Fix this by calling rcar_can_start() from the PM resume callback, to fully initialize the controller instead of just restarting it. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://patch.msgid.link/699b2f7fcb60b31b6f976a37f08ce99c5ffccb31.1755165227.git.geert+renesas@glider.be Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- drivers/net/can/rcar/rcar_can.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 64e664f5adcc..87c134bcd48d 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c@@ -861,7 +861,6 @@ static int rcar_can_resume(struct device *dev) { struct net_device *ndev = dev_get_drvdata(dev); struct rcar_can_priv *priv = netdev_priv(ndev); - u16 ctlr; int err; if (!netif_running(ndev))
@@ -873,12 +872,7 @@ static int rcar_can_resume(struct device *dev) return err; } - ctlr = readw(&priv->regs->ctlr); - ctlr &= ~RCAR_CAN_CTLR_SLPM; - writew(ctlr, &priv->regs->ctlr); - ctlr &= ~RCAR_CAN_CTLR_CANM; - writew(ctlr, &priv->regs->ctlr); - priv->can.state = CAN_STATE_ERROR_ACTIVE; + rcar_can_start(ndev); netif_device_attach(ndev); netif_start_queue(ndev);
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2.51.0