bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0433-of-Make-of_dma_get_range-work-on-bus-nodes.patch b/target/linux/bcm27xx/patches-5.4/950-0433-of-Make-of_dma_get_range-work-on-bus-nodes.patch
new file mode 100644
index 0000000000..1cac2dfcd8
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0433-of-Make-of_dma_get_range-work-on-bus-nodes.patch
@@ -0,0 +1,107 @@
+From 7631cb95056f03136c9e0a35484e8bebe7b52650 Mon Sep 17 00:00:00 2001
+From: Robin Murphy <robin.murphy@arm.com>
+Date: Wed, 3 Jul 2019 18:42:20 +0100
+Subject: [PATCH] of: Make of_dma_get_range() work on bus nodes
+
+commit 951d48855d86e72e0d6de73440fe09d363168064 upstream.
+
+Since the "dma-ranges" property is only valid for a node representing a
+bus, of_dma_get_range() currently assumes the node passed in is a leaf
+representing a device, and starts the walk from its parent. In cases
+like PCI host controllers on typical FDT systems, however, where the PCI
+endpoints are probed dynamically the initial leaf node represents the
+'bus' itself, and this logic means we fail to consider any "dma-ranges"
+describing the host bridge itself. Rework the logic such that
+of_dma_get_range() also works correctly starting from a bus node
+containing "dma-ranges".
+
+While this does mean "dma-ranges" could incorrectly be in a device leaf
+node, there isn't really any way in this function to ensure that a leaf
+node is or isn't a bus node.
+
+Signed-off-by: Robin Murphy <robin.murphy@arm.com>
+[robh: Allow for the bus child node to still be passed in]
+Signed-off-by: Rob Herring <robh@kernel.org>
+Reviewed-by: Robin Murphy <robin.murphy@arm.com>
+Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+---
+ drivers/of/address.c | 44 ++++++++++++++++++--------------------------
+ 1 file changed, 18 insertions(+), 26 deletions(-)
+
+--- a/drivers/of/address.c
++++ b/drivers/of/address.c
+@@ -940,47 +940,39 @@ int of_dma_get_range(struct device_node
+ 	const __be32 *ranges = NULL;
+ 	int len, naddr, nsize, pna;
+ 	int ret = 0;
++	bool found_dma_ranges = false;
+ 	u64 dmaaddr;
+ 
+-	if (!node)
+-		return -EINVAL;
+-
+-	while (1) {
+-		struct device_node *parent;
+-
+-		naddr = of_n_addr_cells(node);
+-		nsize = of_n_size_cells(node);
+-
+-		parent = __of_get_dma_parent(node);
+-		of_node_put(node);
+-
+-		node = parent;
+-		if (!node)
+-			break;
+-
++	while (node) {
+ 		ranges = of_get_property(node, "dma-ranges", &len);
+ 
+ 		/* Ignore empty ranges, they imply no translation required */
+ 		if (ranges && len > 0)
+ 			break;
+ 
+-		/*
+-		 * At least empty ranges has to be defined for parent node if
+-		 * DMA is supported
+-		 */
+-		if (!ranges)
+-			break;
++		/* Once we find 'dma-ranges', then a missing one is an error */
++		if (found_dma_ranges && !ranges) {
++			ret = -ENODEV;
++			goto out;
++		}
++		found_dma_ranges = true;
++
++		node = of_get_next_dma_parent(node);
+ 	}
+ 
+-	if (!ranges) {
++	if (!node || !ranges) {
+ 		pr_debug("no dma-ranges found for node(%pOF)\n", np);
+ 		ret = -ENODEV;
+ 		goto out;
+ 	}
+ 
+-	len /= sizeof(u32);
+-
++	naddr = of_bus_n_addr_cells(node);
++	nsize = of_bus_n_size_cells(node);
+ 	pna = of_n_addr_cells(node);
++	if ((len / sizeof(__be32)) % (pna + naddr + nsize)) {
++		ret = -EINVAL;
++		goto out;
++	}
+ 
+ 	/* dma-ranges format:
+ 	 * DMA addr	: naddr cells
+@@ -988,7 +980,7 @@ int of_dma_get_range(struct device_node
+ 	 * size		: nsize cells
+ 	 */
+ 	dmaaddr = of_read_number(ranges, naddr);
+-	*paddr = of_translate_dma_address(np, ranges);
++	*paddr = of_translate_dma_address(node, ranges + naddr);
+ 	if (*paddr == OF_BAD_ADDR) {
+ 		pr_err("translation of DMA address(%pad) to CPU address failed node(%pOF)\n",
+ 		       dma_addr, np);