Merge patch series "R-Car CAN-FD fixes"

Biju Das <biju.das.jz@bp.renesas.com> says:

This patch series fixes the below issues in R-Car CAN-FD driver.

1) Race condition in CAN driver under heavy CAN load condition
   with both channels enabled results in IRQ storm on global FIFO
   receive IRQ line.
2) Add channel specific TX interrupts handling for RZ/G2L SoC as it has
   separate IRQ lines for each TX.

changes since v1: https://lore.kernel.org/all/20221022081503.1051257-1-biju.das.jz@bp.renesas.com
 * Added check for IRQ active and enabled before handling the IRQ on a
   particular channel.

Link: https://lore.kernel.org/all/20221025155657.1426948-1-biju.das.jz@bp.renesas.com
[mkl: adjust message, add link, take only patches 1 + 2, upstream 3 via can-next]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 11 insertions, 13 deletions

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 567620d215f8..198da643ee6d 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1157,11 +1157,13 @@ static void rcar_canfd_handle_global_receive(struct rcar_canfd_global *gpriv, u3
 {
 	struct rcar_canfd_channel *priv = gpriv->ch[ch];
 	u32 ridx = ch + RCANFD_RFFIFO_IDX;
-	u32 sts;
+	u32 sts, cc;
 
 	/* Handle Rx interrupts */
 	sts = rcar_canfd_read(priv->base, RCANFD_RFSTS(gpriv, ridx));
-	if (likely(sts & RCANFD_RFSTS_RFIF)) {
+	cc = rcar_canfd_read(priv->base, RCANFD_RFCC(gpriv, ridx));
+	if (likely(sts & RCANFD_RFSTS_RFIF &&
+		   cc & RCANFD_RFCC_RFIE)) {
 		if (napi_schedule_prep(&priv->napi)) {
 			/* Disable Rx FIFO interrupts */
 			rcar_canfd_clear_bit(priv->base,
@@ -1244,11 +1246,9 @@ static void rcar_canfd_handle_channel_tx(struct rcar_canfd_global *gpriv, u32 ch
 
 static irqreturn_t rcar_canfd_channel_tx_interrupt(int irq, void *dev_id)
 {
-	struct rcar_canfd_global *gpriv = dev_id;
-	u32 ch;
+	struct rcar_canfd_channel *priv = dev_id;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
-		rcar_canfd_handle_channel_tx(gpriv, ch);
+	rcar_canfd_handle_channel_tx(priv->gpriv, priv->channel);
 
 	return IRQ_HANDLED;
 }
@@ -1276,11 +1276,9 @@ static void rcar_canfd_handle_channel_err(struct rcar_canfd_global *gpriv, u32 c
 
 static irqreturn_t rcar_canfd_channel_err_interrupt(int irq, void *dev_id)
 {
-	struct rcar_canfd_global *gpriv = dev_id;
-	u32 ch;
+	struct rcar_canfd_channel *priv = dev_id;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
-		rcar_canfd_handle_channel_err(gpriv, ch);
+	rcar_canfd_handle_channel_err(priv->gpriv, priv->channel);
 
 	return IRQ_HANDLED;
 }
@@ -1721,6 +1719,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 	priv->ndev = ndev;
 	priv->base = gpriv->base;
 	priv->channel = ch;
+	priv->gpriv = gpriv;
 	priv->can.clock.freq = fcan_freq;
 	dev_info(&pdev->dev, "can_clk rate is %u\n", priv->can.clock.freq);
 
@@ -1749,7 +1748,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 		}
 		err = devm_request_irq(&pdev->dev, err_irq,
 				       rcar_canfd_channel_err_interrupt, 0,
-				       irq_name, gpriv);
+				       irq_name, priv);
 		if (err) {
 			dev_err(&pdev->dev, "devm_request_irq CH Err(%d) failed, error %d\n",
 				err_irq, err);
@@ -1763,7 +1762,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 		}
 		err = devm_request_irq(&pdev->dev, tx_irq,
 				       rcar_canfd_channel_tx_interrupt, 0,
-				       irq_name, gpriv);
+				       irq_name, priv);
 		if (err) {
 			dev_err(&pdev->dev, "devm_request_irq Tx (%d) failed, error %d\n",
 				tx_irq, err);
@@ -1789,7 +1788,6 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 
 	priv->can.do_set_mode = rcar_canfd_do_set_mode;
 	priv->can.do_get_berr_counter = rcar_canfd_get_berr_counter;
-	priv->gpriv = gpriv;
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 
 	netif_napi_add_weight(ndev, &priv->napi, rcar_canfd_rx_poll,