openwrtv3/target/linux/ath79/patches-4.14/0013-MIPS-ath79-fix-system-restart.patch

From 59c7470bc5c4b29ed77d46fc4982f1d85b5cbec1 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 5 Mar 2018 11:33:54 +0100
Subject: [PATCH 13/33] MIPS: ath79: fix system restart

This patch disables irq on reboot to fix hang issues that were observed
due to pending interrupts.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: John Crispin <john@phrozen.org>
---
 arch/mips/ath79/setup.c                  | 1 +
 arch/mips/include/asm/mach-ath79/ath79.h | 1 +
 2 files changed, 2 insertions(+)

--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -40,6 +40,7 @@ static char ath79_sys_type[ATH79_SYS_TYP
 
 static void ath79_restart(char *command)
 {
+	local_irq_disable();
 	ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
 	for (;;)
 		if (cpu_wait)
--- a/arch/mips/include/asm/mach-ath79/ath79.h
+++ b/arch/mips/include/asm/mach-ath79/ath79.h
@@ -167,6 +167,7 @@ static inline u32 ath79_pll_rr(unsigned
 static inline void ath79_reset_wr(unsigned reg, u32 val)
 {
 	__raw_writel(val, ath79_reset_base + reg);
+	(void) __raw_readl(ath79_reset_base + reg); /* flush */
 }
 
 static inline u32 ath79_reset_rr(unsigned reg)