bcm53xx: revert patch removing imprecise abort workaround

It seems it still happens on some devices.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48961 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/bcm53xx/patches-4.4/301-Revert-ARM-BCM5301X-remove-workaround-imprecise-abor.patch b/target/linux/bcm53xx/patches-4.4/301-Revert-ARM-BCM5301X-remove-workaround-imprecise-abor.patch
new file mode 100644 (file)
index 0000000..907c581
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.4/301-Revert-ARM-BCM5301X-remove-workaround-imprecise-abor.patch
@@ -0,0 +1,66 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Tue, 8 Mar 2016 09:03:21 +0100
+Subject: [PATCH] Revert "ARM: BCM5301X: remove workaround imprecise abort
+ fault handler"
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This reverts commit 937b12306ea79044c86f2e69b3061c7279245825.
+
+It seems imprecise external abort (0x1406) can be still happen on
+BCM4709 during PCI initialization.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+
+--- a/arch/arm/mach-bcm/bcm_5301x.c
++++ b/arch/arm/mach-bcm/bcm_5301x.c
+@@ -9,6 +9,40 @@
+ #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",
+@@ -18,5 +52,6 @@ static const char *const bcm5301x_dt_com
+ 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