bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0480-Reduce-noise-from-rpi-poe-hat-fan.patch b/target/linux/bcm27xx/patches-5.4/950-0480-Reduce-noise-from-rpi-poe-hat-fan.patch
new file mode 100644
index 0000000000..7c50843102
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0480-Reduce-noise-from-rpi-poe-hat-fan.patch
@@ -0,0 +1,96 @@
+From 863dace20e48954a7e013a2e88e27c692ce165b0 Mon Sep 17 00:00:00 2001
+From: Nick B <nick@pelagiris.org>
+Date: Mon, 9 Mar 2020 09:05:39 -0400
+Subject: [PATCH] Reduce noise from rpi poe hat fan
+
+This adds 2 extra states, at 40c and 45c, with PWM of 31 and 63 (out
+of 255) for the rpi poe hat fan.  This significantly improves user
+experience by providing a smoother ramp up of the fan, from a pwm 0
+to 31 to 63 then finally to 150, and additionally makes it very easy
+for users to further tweak the values as needed for their specific
+application.
+
+The possible concerns I have are that a hysteresis of 2000 (2c) could
+be too narrow, and that running the fan more at a reduced temperature
+(40000 - 40c) could cause problems.
+
+Signed-off-by: Nick B <nick@pelagiris.org>
+---
+ .../arm/boot/dts/overlays/rpi-poe-overlay.dts | 35 ++++++++++++++++---
+ 1 file changed, 30 insertions(+), 5 deletions(-)
+
+--- a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
++++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
+@@ -14,9 +14,9 @@
+ 				compatible = "raspberrypi,rpi-poe-fan";
+ 				firmware = <&firmware>;
+ 				cooling-min-state = <0>;
+-				cooling-max-state = <2>;
++				cooling-max-state = <4>;
+ 				#cooling-cells = <2>;
+-				cooling-levels = <0 150 255>;
++				cooling-levels = <0 31 63 150 255>;
+ 				status = "okay";
+ 			};
+ 		};
+@@ -27,12 +27,21 @@
+ 		__overlay__ {
+ 			trips {
+ 				trip0: trip0 {
+-					temperature = <50000>;
+-					hysteresis = <5000>;
++					temperature = <40000>;
++					hysteresis = <2000>;
+ 					type = "active";
+ 				};
+ 				trip1: trip1 {
+-
++					temperature = <45000>;
++					hysteresis = <2000>;
++					type = "active";
++				};
++				trip2: trip2 {
++					temperature = <50000>;
++					hysteresis = <2000>;
++					type = "active";
++				};
++				trip3: trip3 {
+ 					temperature = <55000>;
+ 					hysteresis = <5000>;
+ 					type = "active";
+@@ -47,6 +56,14 @@
+ 					trip = <&trip1>;
+ 					cooling-device = <&fan0 1 2>;
+ 				};
++				map2 {
++					trip = <&trip2>;
++					cooling-device = <&fan0 2 3>;
++				};
++				map3 {
++					trip = <&trip3>;
++					cooling-device = <&fan0 3 4>;
++				};
+ 			};
+ 		};
+ 	};
+@@ -58,6 +75,10 @@
+ 			poe_fan_temp0_hyst =	<&trip0>,"hysteresis:0";
+ 			poe_fan_temp1 =		<&trip1>,"temperature:0";
+ 			poe_fan_temp1_hyst =	<&trip1>,"hysteresis:0";
++			poe_fan_temp2 =		<&trip2>,"temperature:0";
++			poe_fan_temp2_hyst =	<&trip2>,"hysteresis:0";
++			poe_fan_temp3 =		<&trip3>,"temperature:0";
++			poe_fan_temp3_hyst =	<&trip3>,"hysteresis:0";
+ 		};
+ 	};
+ 
+@@ -66,5 +87,9 @@
+ 		poe_fan_temp0_hyst =	<&trip0>,"hysteresis:0";
+ 		poe_fan_temp1 =		<&trip1>,"temperature:0";
+ 		poe_fan_temp1_hyst =	<&trip1>,"hysteresis:0";
++		poe_fan_temp2 =		<&trip2>,"temperature:0";
++		poe_fan_temp2_hyst =	<&trip2>,"hysteresis:0";
++		poe_fan_temp3 =		<&trip3>,"temperature:0";
++		poe_fan_temp3_hyst =	<&trip3>,"hysteresis:0";
+ 	};
+ };