From 26db431400c336c4cc658cb4888bab18d254c64a Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 9 Aug 2014 00:00:09 +0200
Subject: [PATCH] MIPS: BCM47XX: fix reboot problem on BCM4705/BCM4785

This adds some code based on code from the Broadcom GPL tar to fix the
reboot problems on BCM4705/BCM4785. I tried rebooting my device for ~10
times and have never seen a problem. This reverts the changes in the
previous commit and adds the real fix as suggested by Rafał.

Setting bit 22 in Reg 22, sel 4 puts the BIU (Bus Interface Unit) into
async mode.

The previous try was this:
commit 316cad5c1d4daee998cd1f83ccdb437f6f20d45c
Author: Hauke Mehrtens <hauke@hauke-m.de>
Date:   Mon Jul 28 23:53:57 2014 +0200

    MIPS: BCM47XX: make reboot more relaiable

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -55,7 +55,16 @@ static void bcm47xx_machine_restart(char
 	switch (bcm47xx_bus_type) {
 #ifdef CONFIG_BCM47XX_SSB
 	case BCM47XX_BUS_TYPE_SSB:
+		if (bcm47xx_bus.ssb.chip_id == 0x4785)
+			write_c0_diag4(1 << 22);
 		ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 1);
+		if (bcm47xx_bus.ssb.chip_id == 0x4785) {
+			__asm__ __volatile__(
+				".set\tmips3\n\t"
+				"sync\n\t"
+				"wait\n\t"
+				".set\tmips0");
+		}
 		break;
 #endif
 #ifdef CONFIG_BCM47XX_BCMA