Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
To:     Conor Dooley <conor.dooley@microchip.com>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Sasha Levin <sashal@kernel.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Atish Patra <atish.patra@wdc.com>, devicetree@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        Heinrich Schuchardt <heinrich.schuchardt@canonical.com>,
        stable@vger.kernel.org
Subject: [PATCH 1/1] riscv: dts: microchip: correct L2 cache interrupts
Date:   Mon, 29 Aug 2022 11:10:34 +0200
Message-Id: <20220829091034.109258-1-heinrich.schuchardt@canonical.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

This is a backport of commit 34fc9cc3aebe to v5.15.

The "PolarFire SoC MSS Technical Reference Manual" documents the
following PLIC interrupts:

1 - L2 Cache Controller Signals when a metadata correction event occurs
2 - L2 Cache Controller Signals when an uncorrectable metadata event occurs
3 - L2 Cache Controller Signals when a data correction event occurs
4 - L2 Cache Controller Signals when an uncorrectable data event occurs

This differs from the SiFive FU540 which only has three L2 cache related
interrupts.

The sequence in the device tree is defined by an enum:

    enum {
            DIR_CORR = 0,
            DATA_CORR,
            DATA_UNCORR,
            DIR_UNCORR,
    };

So the correct sequence of the L2 cache interrupts is

    interrupts = <1>, <3>, <4>, <2>;

This manifests as an unusable system if the l2-cache driver is enabled,
as the wrong interrupt gets cleared & the handler prints errors to the
console ad infinitum.

Fixes: 0fa6107eca41 ("RISC-V: Initial DTS for Microchip ICICLE board")
CC: stable@vger.kernel.org # 5.15: e35b07a7df9b: riscv: dts: microchip: mpfs: Group tuples in interrupt properties
Link: https://lore.kernel.org/all/20220817132521.3159388-1-heinrich.schuchardt@canonical.com/
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
---
 arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
index 4ef4bcb74872..57989b2ac186 100644
--- a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
+++ b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
@@ -153,7 +153,7 @@ cache-controller@2010000 {
 			cache-size = <2097152>;
 			cache-unified;
 			interrupt-parent = <&plic>;
-			interrupts = <1 2 3>;
+			interrupts = <1>, <3>, <4>, <2>;
 			reg = <0x0 0x2010000 0x0 0x1000>;
 		};
 
-- 
2.37.2