From d14ccea0e71a55ad02bf4e1cb378bbece282d5cf Mon Sep 17 00:00:00 2001 From: Quentin Schulz Date: Fri, 5 May 2017 15:50:33 +0200 Subject: [PATCH] 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 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/m_can/m_can.c | 15 ++++++++++++--- 1 file 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); } -- 2.11.0