layerscape: add patches-5.4

Add patches for linux-5.4. The patches are from NXP LSDK-20.04 release
which was tagged LSDK-20.04-V5.4.
https://source.codeaurora.org/external/qoriq/qoriq-components/linux/

For boards LS1021A-IOT, and Traverse-LS1043 which are not involved in
LSDK, port the dts patches from 4.14.

The patches are sorted into the following categories:
  301-arch-xxxx
  302-dts-xxxx
  303-core-xxxx
  701-net-xxxx
  801-audio-xxxx
  802-can-xxxx
  803-clock-xxxx
  804-crypto-xxxx
  805-display-xxxx
  806-dma-xxxx
  807-gpio-xxxx
  808-i2c-xxxx
  809-jailhouse-xxxx
  810-keys-xxxx
  811-kvm-xxxx
  812-pcie-xxxx
  813-pm-xxxx
  814-qe-xxxx
  815-sata-xxxx
  816-sdhc-xxxx
  817-spi-xxxx
  818-thermal-xxxx
  819-uart-xxxx
  820-usb-xxxx
  821-vfio-xxxx

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/target/linux/layerscape/patches-5.4/802-can-0015-can-flexcan-flexcan_read_reg_iflag_rx-optimize-readi.patch b/target/linux/layerscape/patches-5.4/802-can-0015-can-flexcan-flexcan_read_reg_iflag_rx-optimize-readi.patch
new file mode 100644
index 0000000000..cf7a6fdcbe
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/802-can-0015-can-flexcan-flexcan_read_reg_iflag_rx-optimize-readi.patch
@@ -0,0 +1,68 @@
+From 74920ba156136a58dd3411c02d429d4f31497dc0 Mon Sep 17 00:00:00 2001
+From: Marc Kleine-Budde <mkl@pengutronix.de>
+Date: Fri, 1 Mar 2019 15:38:05 +0100
+Subject: [PATCH] can: flexcan: flexcan_read_reg_iflag_rx(): optimize reading
+
+The flexcan IP core has up to 64 mailboxes, each one has a corresponding
+interrupt bit in the iflag1 or iflag2 registers and a mask bit in the
+imask1 or imask2 registers.
+
+In the timestamp (i.e. non FIFO) mode the driver needs to mask all non RX
+interrupt sources, it uses the precomputed value rx_mask of struct flexcan_priv
+for this.
+
+In certain use cases, for example the CANFD mode, the contents of the iflag2
+register is completely masked.
+
+This patch optimizes the flexcan_read_reg_iflag_rx() function by not reading
+the iflag1 or iflag2 register if the contents is masked.
+
+Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
+---
+ drivers/net/can/flexcan.c | 28 +++++++++++++++++-----------
+ 1 file changed, 17 insertions(+), 11 deletions(-)
+
+--- a/drivers/net/can/flexcan.c
++++ b/drivers/net/can/flexcan.c
+@@ -779,6 +779,23 @@ static void flexcan_irq_state(struct net
+ 		dev->stats.rx_fifo_errors++;
+ }
+ 
++static inline u64 flexcan_read64_mask(struct flexcan_priv *priv, void __iomem *addr, u64 mask)
++{
++	u64 reg = 0;
++
++	if (upper_32_bits(mask))
++		reg = (u64)priv->read(addr - 4) << 32;
++	if (lower_32_bits(mask))
++		reg |= priv->read(addr);
++
++	return reg & mask;
++}
++
++static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)
++{
++	return flexcan_read64_mask(priv, &priv->regs->iflag1, priv->rx_mask);
++}
++
+ static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload)
+ {
+ 	return container_of(offload, struct flexcan_priv, offload);
+@@ -873,17 +890,6 @@ static struct sk_buff *flexcan_mailbox_r
+ 	return skb;
+ }
+ 
+-static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)
+-{
+-	struct flexcan_regs __iomem *regs = priv->regs;
+-	u64 iflag;
+-
+-	iflag = (u64)priv->read(&regs->iflag2) << 32 |
+-		priv->read(&regs->iflag1);
+-
+-	return iflag & priv->rx_mask;
+-}
+-
+ static irqreturn_t flexcan_irq(int irq, void *dev_id)
+ {
+ 	struct net_device *dev = dev_id;