bcm53xx: use backported BCM5301X patches from stblinux soc/next

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 47707

target/linux/bcm53xx/patches-4.4/020-ARM-BCM5301X-remove-workaround-imprecise-abort-fault.patch

+From 937b12306ea79044c86f2e69b3061c7279245825 Mon Sep 17 00:00:00 2001
+From: Lucas Stach <l.stach@pengutronix.de>
+Date: Thu, 15 Oct 2015 12:32:22 +0200
+Subject: [PATCH] ARM: BCM5301X: remove workaround imprecise abort fault
+ handler
+
+This is not needed anymore. Handling a potentially pending imprecise external
+abort left behind by the bootloader is now done in a slightly safer way inside
+the common ARM startup code.
+
+Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
+Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
+Tested-by: Tyler Baker <tyler.baker@linaro.org>
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+---
+ arch/arm/mach-bcm/bcm_5301x.c | 35 -----------------------------------
+ 1 file changed, 35 deletions(-)
+
+--- a/arch/arm/mach-bcm/bcm_5301x.c
++++ b/arch/arm/mach-bcm/bcm_5301x.c
+@@ -9,40 +9,6 @@
+ #include <asm/hardware/cache-l2x0.h>
+ 
+ #include <asm/mach/arch.h>
+-#include <asm/siginfo.h>
+-#include <asm/signal.h>
+-
+-
+-static bool first_fault = true;
+-
+-static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
+-				 struct pt_regs *regs)
+-{
+-	if ((fsr == 0x1406 || fsr == 0x1c06) && first_fault) {
+-		first_fault = false;
+-
+-		/*
+-		 * These faults with codes 0x1406 (BCM4709) or 0x1c06 happens
+-		 * for no good reason, possibly left over from the CFE boot
+-		 * loader.
+-		 */
+-		pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
+-			addr, fsr);
+-
+-		/* Returning non-zero causes fault display and panic */
+-		return 0;
+-	}
+-
+-	/* Others should cause a fault */
+-	return 1;
+-}
+-
+-static void __init bcm5301x_init_early(void)
+-{
+-	/* Install our hook */
+-	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
+-			"imprecise external abort");
+-}
+ 
+ static const char *const bcm5301x_dt_compat[] __initconst = {
+ 	"brcm,bcm4708",
+@@ -52,6 +18,5 @@ static const char *const bcm5301x_dt_compat[] __initconst = {
+ DT_MACHINE_START(BCM5301X, "BCM5301X")
+ 	.l2c_aux_val	= 0,
+ 	.l2c_aux_mask	= ~0,
+-	.init_early	= bcm5301x_init_early,
+ 	.dt_compat	= bcm5301x_dt_compat,
+ MACHINE_END