Add a flag to the suspend class function that leaves the chip in a
running state with rx interrupt enabled, so that m_can device driver can
configure and use the interrupt as a wakeup source.
Signed-off-by: Martin Hundebøll <martin@xxxxxxxxxx>
---
drivers/net/can/m_can/m_can.c | 13 +++++++++++--
drivers/net/can/m_can/m_can.h | 2 +-
drivers/net/can/m_can/m_can_platform.c | 2 +-
3 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 16ecc11c7f62..21ac826170f9 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -2113,7 +2113,7 @@ void m_can_class_unregister(struct m_can_classdev *cdev)
}
EXPORT_SYMBOL_GPL(m_can_class_unregister);
-int m_can_class_suspend(struct device *dev)
+int m_can_class_suspend(struct device *dev, bool is_wake_source)
{
struct m_can_classdev *cdev = dev_get_drvdata(dev);
struct net_device *ndev = cdev->net;
@@ -2121,7 +2121,16 @@ int m_can_class_suspend(struct device *dev)
if (netif_running(ndev)) {
netif_stop_queue(ndev);
netif_device_detach(ndev);
- m_can_stop(ndev);
+
+ /*
+ * leave the chip running with rx interrupt enabled if it used
+ * as a wake-up source.
+ */
+ if (is_wake_source)
+ m_can_write(cdev, M_CAN_IE, IR_RF0N);
+ else
+ m_can_stop(ndev);
+
m_can_clk_stop(cdev);
}
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index 520e14277dff..542e8daad578 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -105,6 +105,6 @@ int m_can_class_get_clocks(struct m_can_classdev *cdev);
int m_can_init_ram(struct m_can_classdev *priv);
int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size);
-int m_can_class_suspend(struct device *dev);
+int m_can_class_suspend(struct device *dev, bool is_wake_source);
int m_can_class_resume(struct device *dev);
#endif /* _CAN_M_H_ */
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index cdb28d6a092c..bbf6a245a3e0 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -169,7 +169,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
static __maybe_unused int m_can_suspend(struct device *dev)
{
- return m_can_class_suspend(dev);
+ return m_can_class_suspend(dev, false);
}
static __maybe_unused int m_can_resume(struct device *dev)
--
2.42.0
