mvebu: armada 370: dts: fix the crypto engine

The crypto engine in Armada 370 SoCs is currently broken. It can be
checked installing the required packages for testing openssl with hw
acceleration:

  opkg install openssl-util
  opkg install kmod-cryptodev
  opkg install libopenssl-devcrypto

After configuring /etc/ssl/openssl.cnf to let openssl use the crypto
engine for digest operations, and performing some checksums..

  md5sum 10M-file.bin
  openssl md5 10M-file.bin

...we can see they don't match.

There might be an alignment or size constraint issue caused by the
idle-sram area.

Use the whole crypto sram and disable the idle-sram area to fix it. Also
disable the idle support by adding the broken-idle property to prevent
accessing the disabled idle-sram.

We don't care about disabling the idle support since it is already broken
in Armada 370 causing a huge performance loss because it disables
permanently the L2 cache. This was reported in the Openwrt forum and
elsewhere by Debian users with different board models.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
(cherry picked from commit 2e1ebe96c6)

target/linux/mvebu/patches-5.10/317-armada-370-dts-fix-crypto-engine.patch

@@ -0,0 +1,29 @@
+--- a/arch/arm/boot/dts/armada-370.dtsi
++++ b/arch/arm/boot/dts/armada-370.dtsi
+@@ -234,7 +234,7 @@
+ 				clocks = <&gateclk 23>;
+ 				clock-names = "cesa0";
+ 				marvell,crypto-srams = <&crypto_sram>;
+-				marvell,crypto-sram-size = <0x7e0>;
++				marvell,crypto-sram-size = <0x800>;
+ 			};
+ 		};
+ 
+@@ -255,12 +255,17 @@
+ 			 * cpuidle workaround.
+ 			 */
+ 			idle-sram@0 {
++				status = "disabled";
+ 				reg = <0x0 0x20>;
+ 			};
+ 		};
+ 	};
+ };
+ 
++&coherencyfab {
++	broken-idle;
++};
++
+ /*
+  * Default UART pinctrl setting without RTS/CTS, can be overwritten on
+  * board level if a different configuration is used.

target/linux/mvebu/patches-5.4/320-armada-370-dts-fix-crypto-engine.patch

@@ -0,0 +1,29 @@
+--- a/arch/arm/boot/dts/armada-370.dtsi
++++ b/arch/arm/boot/dts/armada-370.dtsi
+@@ -234,7 +234,7 @@
+ 				clocks = <&gateclk 23>;
+ 				clock-names = "cesa0";
+ 				marvell,crypto-srams = <&crypto_sram>;
+-				marvell,crypto-sram-size = <0x7e0>;
++				marvell,crypto-sram-size = <0x800>;
+ 			};
+ 		};
+ 
+@@ -255,12 +255,17 @@
+ 			 * cpuidle workaround.
+ 			 */
+ 			idle-sram@0 {
++				status = "disabled";
+ 				reg = <0x0 0x20>;
+ 			};
+ 		};
+ 	};
+ };
+ 
++&coherencyfab {
++	broken-idle;
++};
++
+ /*
+  * Default UART pinctrl setting without RTS/CTS, can be overwritten on
+  * board level if a different configuration is used.