ARM: dts: mvebu: pl310-cache disable double-linefill

Under heavy system stress mvebu SoC using Cortex A9 sporadically
encountered instability issues.

The "double linefill" feature of L2 cache was identified as causing
dependency between read and write which lead to the deadlock.

Especially, it was the cause of deadlock seen under heavy PCIe traffic,
as this dependency violates PCIE overtaking rule.

Fixes: c8f5a878e554 ("ARM: mvebu: use DT properties to fine-tune the L2 configuration")
Cc: stable@vger.kernel.org
Signed-off-by: Yan Markman <ymarkman@marvell.com>
Signed-off-by: Igal Liberman <igall@marvell.com>
Signed-off-by: Nadav Haklai <nadavh@marvell.com>
[gregory.clement@free-electrons.com: reformulate commit log, add Armada
375 and add Fixes tag]
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

diff --git a/arch/arm/boot/dts/armada-375.dtsi b/arch/arm/boot/dts/armada-375.dtsi
index 7225c7ce9a8dbca5cb909c0c1b55376072c2e263..2cb1bcd309760a01b0e99b33b444c01032344518 100644 (file)
--- a/arch/arm/boot/dts/armada-375.dtsi
+++ b/arch/arm/boot/dts/armada-375.dtsi
@@ -178,9 +178,9 @@
                                reg = <0x8000 0x1000>;
                                cache-unified;
                                cache-level = <2>;
-                               arm,double-linefill-incr = <1>;
+                               arm,double-linefill-incr = <0>;
                                arm,double-linefill-wrap = <0>;
-                               arm,double-linefill = <1>;
+                               arm,double-linefill = <0>;
                                prefetch-data = <1>;
                        };
 

diff --git a/arch/arm/boot/dts/armada-38x.dtsi b/arch/arm/boot/dts/armada-38x.dtsi
index 4960722aab32a1cf644ddb1e69d792845c240d44..00ff549d4e391798ab119dc85b165db05d1b93d1 100644 (file)
--- a/arch/arm/boot/dts/armada-38x.dtsi
+++ b/arch/arm/boot/dts/armada-38x.dtsi
@@ -143,9 +143,9 @@
                                reg = <0x8000 0x1000>;
                                cache-unified;
                                cache-level = <2>;
-                               arm,double-linefill-incr = <1>;
+                               arm,double-linefill-incr = <0>;
                                arm,double-linefill-wrap = <0>;
-                               arm,double-linefill = <1>;
+                               arm,double-linefill = <0>;
                                prefetch-data = <1>;
                        };
 

diff --git a/arch/arm/boot/dts/armada-39x.dtsi b/arch/arm/boot/dts/armada-39x.dtsi
index ea657071e27888c49294556e047f556d499f6300..5218bd2a248d0e8768f60b37a328bc02fc3d617a 100644 (file)
--- a/arch/arm/boot/dts/armada-39x.dtsi
+++ b/arch/arm/boot/dts/armada-39x.dtsi
@@ -111,9 +111,9 @@
                                reg = <0x8000 0x1000>;
                                cache-unified;
                                cache-level = <2>;
-                               arm,double-linefill-incr = <1>;
+                               arm,double-linefill-incr = <0>;
                                arm,double-linefill-wrap = <0>;
-                               arm,double-linefill = <1>;
+                               arm,double-linefill = <0>;
                                prefetch-data = <1>;
                        };