ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/target/linux/layerscape/patches-5.4/802-can-0008-can-flexcan-flexcan_irq_state-only-read-timestamp-if.patch b/target/linux/layerscape/patches-5.4/802-can-0008-can-flexcan-flexcan_irq_state-only-read-timestamp-if.patch
new file mode 100644
index 0000000..2f839fc
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/802-can-0008-can-flexcan-flexcan_irq_state-only-read-timestamp-if.patch
@@ -0,0 +1,38 @@
+From 1a92e5a9109963e2491eec111b84b35b4e2adc8f Mon Sep 17 00:00:00 2001
+From: Marc Kleine-Budde <mkl@pengutronix.de>
+Date: Wed, 9 Oct 2019 15:15:37 +0200
+Subject: [PATCH] can: flexcan: flexcan_irq_state(): only read timestamp if
+ needed
+
+The function flexcan_irq_state() checks the controller for CAN state
+changes and pushes a skb with the new state and a timestamp into the
+rx-offload framework.
+
+This patch optimizes the function by only reading the timestamp, if a
+state change is detected.
+
+Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
+---
+ drivers/net/can/flexcan.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/can/flexcan.c
++++ b/drivers/net/can/flexcan.c
+@@ -751,8 +751,6 @@ static void flexcan_irq_state(struct net
+ u32 timestamp;
+ int err;
+
+- timestamp = priv->read(®s->timer) << 16;
+-
+ flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
+ if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
+ tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
+@@ -772,6 +770,8 @@ static void flexcan_irq_state(struct net
+ if (likely(new_state == priv->can.state))
+ return;
+
++ timestamp = priv->read(®s->timer) << 16;
++
+ skb = alloc_can_err_skb(dev, &cf);
+ if (unlikely(!skb))
+ return;