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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2025-08-14 13:26:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-02 13:44:08 +0200 |
| commit | 7a75aae4c0c217c08755e172aebd0506759f20bd (patch) | |
| tree | 2aad04982294aee46c282867b2a35ce5eb671d40 /drivers | |
| parent | 79dc6d4932de49a01abf5fdd33b51d0af7d63187 (diff) | |
| download | linux-7a75aae4c0c217c08755e172aebd0506759f20bd.tar.gz linux-7a75aae4c0c217c08755e172aebd0506759f20bd.tar.bz2 linux-7a75aae4c0c217c08755e172aebd0506759f20bd.zip | |
can: rcar_can: rcar_can_resume(): fix s2ram with PSCI
[ Upstream commit 5c793afa07da6d2d4595f6c73a2a543a471bb055 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/can/rcar/rcar_can.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c index 2b7dd359f27b..8569178b66df 100644 --- a/drivers/net/can/rcar/rcar_can.c +++ b/drivers/net/can/rcar/rcar_can.c @@ -861,7 +861,6 @@ static int __maybe_unused 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 __maybe_unused 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); |