On 29/08/2022 10:10, Heinrich Schuchardt wrote:

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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

Looks like I screwed up here... I assume the non-application is due to the rename.

Link: https://lore.kernel.org/all/20220817132521.3159388-1-heinrich.schuchardt@can... 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>;
  

Acked-by: Conor Dooley conor.dooley@microchip.com

Thanks Heinrich.

                     reg = <0x0 0x2010000 0x0 0x1000>;
             };

-- 2.37.2