linux-kernel - [PATCH AUTOSEL 4.9 12/43] MIPS: ath79: fix system restart

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Date:   Fri, 7 Sep 2018 00:38:27 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 12/43] MIPS: ath79: fix system restart

From: Felix Fietkau <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 <nbd@....name>
Signed-off-by: John Crispin <john@...ozen.org>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Patchwork: https://patchwork.linux-mips.org/patch/19913/
Cc: James Hogan <jhogan@...nel.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.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