From 501c098a1f2cdaa930cb1a7166d3724467890a64 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Wed, 1 Jul 2015 13:28:39 +0200 Subject: [PATCH] arm: mvebu: Disable MBUS error propagation Accessing MBUS windows not backed-up by e.g. PCIe devices will hang the SoC. Disable MBUS error propagation back to CPU allows to read 0xffffffff instead of hanging the SoC. Signed-off-by: Stefan Roese Cc: Luka Perkov --- arch/arm/mach-mvebu/cpu.c | 3 +++ arch/arm/mach-mvebu/include/mach/soc.h | 3 +++ 2 files changed, 6 insertions(+) diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c index 23c2a9782f..fa82067ba8 100644 --- a/arch/arm/mach-mvebu/cpu.c +++ b/arch/arm/mach-mvebu/cpu.c @@ -241,6 +241,9 @@ int arch_cpu_init(void) */ mvebu_mbus_probe(windows, ARRAY_SIZE(windows)); + /* Disable MBUS error propagation */ + clrsetbits_le32(SOC_COHERENCY_FABRIC_CTRL_REG, MBUS_ERR_PROP_EN, 0); + return 0; } #endif /* CONFIG_ARCH_CPU_INIT */ diff --git a/arch/arm/mach-mvebu/include/mach/soc.h b/arch/arm/mach-mvebu/include/mach/soc.h index 71254c5d46..a29e5dcedc 100644 --- a/arch/arm/mach-mvebu/include/mach/soc.h +++ b/arch/arm/mach-mvebu/include/mach/soc.h @@ -66,6 +66,9 @@ #define MVEBU_SATA0_BASE (MVEBU_REGISTER(0xa8000)) #define MVEBU_SDIO_BASE (MVEBU_REGISTER(0xd8000)) +#define SOC_COHERENCY_FABRIC_CTRL_REG (MVEBU_REGISTER(0x20200)) +#define MBUS_ERR_PROP_EN (1 << 8) + #define MBUS_BRIDGE_WIN_CTRL_REG (MVEBU_REGISTER(0x20250)) #define MBUS_BRIDGE_WIN_BASE_REG (MVEBU_REGISTER(0x20254)) -- 2.25.1