Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Just minor overlapping changes in the conflicts here.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 33 insertions, 6 deletions

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 09d8e623dcf6..dc5695dffc2e 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -404,9 +404,10 @@ static void flexcan_enable_wakeup_irq(struct flexcan_priv *priv, bool enable)
 	priv->write(reg_mcr, &regs->mcr);
 }
 
-static inline void flexcan_enter_stop_mode(struct flexcan_priv *priv)
+static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv)
 {
 	struct flexcan_regs __iomem *regs = priv->regs;
+	unsigned int ackval;
 	u32 reg_mcr;
 
 	reg_mcr = priv->read(&regs->mcr);
@@ -416,20 +417,37 @@ static inline void flexcan_enter_stop_mode(struct flexcan_priv *priv)
 	/* enable stop request */
 	regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
 			   1 << priv->stm.req_bit, 1 << priv->stm.req_bit);
+
+	/* get stop acknowledgment */
+	if (regmap_read_poll_timeout(priv->stm.gpr, priv->stm.ack_gpr,
+				     ackval, ackval & (1 << priv->stm.ack_bit),
+				     0, FLEXCAN_TIMEOUT_US))
+		return -ETIMEDOUT;
+
+	return 0;
 }
 
-static inline void flexcan_exit_stop_mode(struct flexcan_priv *priv)
+static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
 {
 	struct flexcan_regs __iomem *regs = priv->regs;
+	unsigned int ackval;
 	u32 reg_mcr;
 
 	/* remove stop request */
 	regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
 			   1 << priv->stm.req_bit, 0);
 
+	/* get stop acknowledgment */
+	if (regmap_read_poll_timeout(priv->stm.gpr, priv->stm.ack_gpr,
+				     ackval, !(ackval & (1 << priv->stm.ack_bit)),
+				     0, FLEXCAN_TIMEOUT_US))
+		return -ETIMEDOUT;
+
 	reg_mcr = priv->read(&regs->mcr);
 	reg_mcr &= ~FLEXCAN_MCR_SLF_WAK;
 	priv->write(reg_mcr, &regs->mcr);
+
+	return 0;
 }
 
 static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv)
@@ -1455,10 +1473,10 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)
 
 	priv = netdev_priv(dev);
 	priv->stm.gpr = syscon_node_to_regmap(gpr_np);
-	of_node_put(gpr_np);
 	if (IS_ERR(priv->stm.gpr)) {
 		dev_dbg(&pdev->dev, "could not find gpr regmap\n");
-		return PTR_ERR(priv->stm.gpr);
+		ret = PTR_ERR(priv->stm.gpr);
+		goto out_put_node;
 	}
 
 	priv->stm.req_gpr = out_val[1];
@@ -1477,6 +1495,10 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)
 		device_set_wakeup_enable(&pdev->dev, true);
 
 	return 0;
+
+out_put_node:
+	of_node_put(gpr_np);
+	return ret;
 }
 
 static const struct of_device_id flexcan_of_match[] = {
@@ -1644,7 +1666,9 @@ static int __maybe_unused flexcan_suspend(struct device *device)
 		 */
 		if (device_may_wakeup(device)) {
 			enable_irq_wake(dev->irq);
-			flexcan_enter_stop_mode(priv);
+			err = flexcan_enter_stop_mode(priv);
+			if (err)
+				return err;
 		} else {
 			err = flexcan_chip_disable(priv);
 			if (err)
@@ -1717,10 +1741,13 @@ static int __maybe_unused flexcan_noirq_resume(struct device *device)
 {
 	struct net_device *dev = dev_get_drvdata(device);
 	struct flexcan_priv *priv = netdev_priv(dev);
+	int err;
 
 	if (netif_running(dev) && device_may_wakeup(device)) {
 		flexcan_enable_wakeup_irq(priv, false);
-		flexcan_exit_stop_mode(priv);
+		err = flexcan_exit_stop_mode(priv);
+		if (err)
+			return err;
 	}
 
 	return 0;