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authorQuentin Schulz <quentin.schulz@free-electrons.com>2017-05-05 15:50:33 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2017-05-18 10:32:48 +0200
commitd14ccea0e71a55ad02bf4e1cb378bbece282d5cf (patch)
tree522915a361c2cfed30a84d5e41f261029ca03bb2 /drivers/net/can/m_can
parentef7b8aa8ca4acdd0541c622230de93bb3389ef41 (diff)
can: m_can: add deep Suspend/Resume support
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> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/m_can')
-rw-r--r--drivers/net/can/m_can/m_can.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 653b304d7091..f4947a74b65f 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1668,6 +1668,8 @@ failed_ret:
return ret;
}
+/* TODO: runtime PM with power down or sleep mode */
+
static __maybe_unused int m_can_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
@@ -1676,10 +1678,10 @@ 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);
+ m_can_clk_stop(priv);
}
- /* TODO: enter low power */
-
priv->can.state = CAN_STATE_SLEEPING;
return 0;
@@ -1690,11 +1692,18 @@ 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;
+
+ ret = m_can_clk_start(priv);
+ if (ret)
+ return ret;
+
+ m_can_start(ndev);
netif_device_attach(ndev);
netif_start_queue(ndev);
}