bcm27xx: add kernel 5.10 support

Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted
patches, wireless patches and defconfig patches.

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

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

1 files changed, 27 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.10/950-0033-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch b/target/linux/bcm27xx/patches-5.10/950-0033-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch
new file mode 100644
index 0000000000..8a341f2a0c
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.10/950-0033-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch
@@ -0,0 +1,27 @@
+From f44d321993ccf1707f5774dc443b900adae5d9d5 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 29 Sep 2017 10:32:19 +0100
+Subject: [PATCH] amba_pl011: Insert mb() for correct FIFO handling
+
+The pl011 register accessor functions use the _relaxed versions of the
+standard readl() and writel() functions, meaning that there are no
+automatic memory barriers. When polling a FIFO status register to check
+for fullness, it is necessary to ensure that any outstanding writes have
+completed; otherwise the flags are effectively stale, making it possible
+that the next write is to a full FIFO.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/tty/serial/amba-pl011.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/tty/serial/amba-pl011.c
++++ b/drivers/tty/serial/amba-pl011.c
+@@ -1377,6 +1377,7 @@ static bool pl011_tx_char(struct uart_am
+ 		return false; /* unable to transmit character */
+ 
+ 	pl011_write(c, uap, REG_DR);
++	mb();
+ 	uap->port.icount.tx++;
+ 
+ 	return true;