From: Felix Fietkau <n...@nbd.name>

[ Upstream commit f8a7bfe1cb2c1ebfa07775c9c8ac0ad3ba8e5ff5 ]

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

Signed-off-by: Felix Fietkau <n...@nbd.name>
Signed-off-by: John Crispin <j...@phrozen.org>
Signed-off-by: Paul Burton <paul.bur...@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19913/
Cc: James Hogan <jho...@kernel.org>
Cc: Ralf Baechle <r...@linux-mips.org>
Cc: linux-m...@linux-mips.org
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 arch/mips/ath79/setup.c                  | 1 +
 arch/mips/include/asm/mach-ath79/ath79.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c
index f206dafbb0a3..26a058d58d37 100644
--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -40,6 +40,7 @@ static char ath79_sys_type[ATH79_SYS_TYPE_LEN];
 
 static void ath79_restart(char *command)
 {
+       local_irq_disable();
        ath79_device_reset_set(AR71XX_RESET_FULL_CHIP);
        for (;;)
                if (cpu_wait)
diff --git a/arch/mips/include/asm/mach-ath79/ath79.h 
b/arch/mips/include/asm/mach-ath79/ath79.h
index 441faa92c3cd..6e6c0fead776 100644
--- a/arch/mips/include/asm/mach-ath79/ath79.h
+++ b/arch/mips/include/asm/mach-ath79/ath79.h
@@ -134,6 +134,7 @@ static inline u32 ath79_pll_rr(unsigned reg)
 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)
-- 
2.17.1

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