[PATCH v3 2/2] can: m_can: add deep Suspend/Resume support

[Quentin Schulz <quentin.schulz@free-electrons.com>]

This adds Power Management deep Suspend/Resume support for Bosch M_CAN
chip.

When entering deep sleep, the clocks are gated, the interrupts are
disabled. When resuming from deep sleep, the chip needs to be
reinitialized, the clocks ungated and the interrupts enabled.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
---

v3:
 - do not close/reopen the can interface (which was previously done when
 calling m_can_close), basically do the same routine as in probe but
 it does not close/open the can device,
 - update commit log,

v2:
 - fix erroneous commit log,

 drivers/net/can/m_can/m_can.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 3f0445440146..0a06690febe2 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1672,10 +1672,9 @@ static __maybe_unused int m_can_suspend(struct device *dev)
 	if (netif_running(ndev)) {
 		netif_stop_queue(ndev);
 		netif_device_detach(ndev);
+		m_can_stop(ndev);
 	}
 
-	/* TODO: enter low power */
-
 	priv->can.state = CAN_STATE_SLEEPING;
 
 	return 0;
@@ -1686,11 +1685,23 @@ static __maybe_unused int m_can_resume(struct device *dev)
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct m_can_priv *priv = netdev_priv(ndev);
 
-	/* TODO: exit low power */
+	m_can_init_ram(priv);
 
 	priv->can.state = CAN_STATE_ERROR_ACTIVE;
 
 	if (netif_running(ndev)) {
+		int ret = clk_prepare_enable(priv->hclk);
+
+		if (ret)
+			return ret;
+
+		ret = clk_prepare_enable(priv->cclk);
+		if (ret) {
+			clk_disable_unprepare(priv->hclk);
+			return ret;
+		}
+
+		m_can_start(ndev);
 		netif_device_attach(ndev);
 		netif_start_queue(ndev);
 	}
-- 
2.11.0