From b2d60b2f32b3a8636c7db65b780ce59a211116f8 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <tpearson@raptorengineering.com>
Date: Mon, 28 Aug 2017 21:59:49 -0500
Subject: Add workaround to prevent BMC timer lockup and reboot This is a bit
 of a nasty hack but it works...

---
 .../fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh  | 45 ++++++++++++++++++++++
 .../recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh    |  4 ++
 .../recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend    |  2 +
 3 files changed, 51 insertions(+)
 create mode 100755 meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh
 mode change 100644 => 100755 meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh

(limited to 'meta-raptor/meta-asus/recipes-core/fan-ctrl')

diff --git a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh
new file mode 100755
index 0000000..d8631dd
--- /dev/null
+++ b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh
@@ -0,0 +1,45 @@
+#/bin/bash
+#
+# Copyright 2017 Raptor Engineering, LLC
+#
+# Work around glitchy timer0 on the AST2050
+# For an unknown reason, sometimes when timer0
+# expires it does not fire an IRQ.  This in turn
+# causes Linux to hang waiting for the timer to
+# expire, causing all nanosleep calls to stall
+# indefinitely.  On a stock OpenBMC system, this
+# manifests as a spontanous reboot every few hours
+# of uptime as the watchdog timer kicks in.
+#
+# This script works around the problem by watching
+# timer0 and seeing if it is stuck at 0.  If so, it
+# gives the afflicted timer a good kick in the rear
+# to get it going again, which in turn un-stalls all
+# of the queued nanosleep calls.
+#
+# Note that due to what this does and how it operates,
+# using sleep in this script is a VERY BAD IDEA!
+
+function daemon_process {
+	while [[ 1 == 1 ]]; do
+		TIMER_COUNT=$(devmem 0x1e782000 32)
+		if [[ "$TIMER_COUNT" == "0x00000000" ]]; then
+			TIMER_COUNT=$(devmem 0x1e782000 32)
+			if [[ "$TIMER_COUNT" == "0x00000000" ]]; then
+				echo "Kicking timer back into operation!"
+				devmem 0x1e782004 32 0x00000001
+			fi
+		fi
+
+		# Busy wait at highest niceness
+		COUNTER=1000
+		until [[ $COUNTER -lt 1 ]]; do
+			let COUNTER-=1
+		done
+	done
+}
+
+renice -n 19 $$
+
+daemon_process < /dev/null &
+disown
diff --git a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh
old mode 100644
new mode 100755
index 2b2e902..1016715
--- a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh
+++ b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh
@@ -28,6 +28,10 @@
 # Short-Description: Set fan speed
 ### END INIT INFO
 
+echo -n "Start AST2050 timer workaround..."
+/usr/local/bin/ast2050-timer-workaround.sh > /dev/null
+echo "done".
+
 echo -n "Setup fan speed... "
 rmmod w83795 || true
 /usr/local/bin/platform_sensor_init
diff --git a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend
index b6f0ae1..ae0508a 100644
--- a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend
+++ b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend
@@ -22,6 +22,7 @@ SRC_URI += "file://get_fan_speed.sh \
             file://set_fan_speed.sh \
             file://init_pwm.sh \
             file://setup-fan.sh \
+            file://ast2050-timer-workaround.sh \
            "
 
 S = "${WORKDIR}"
@@ -32,6 +33,7 @@ binfiles = "                                    \
     init_pwm.sh					\
     fand					\
     platform_sensor_init			\
+    ast2050-timer-workaround.sh			\
     "
 
 CXXFLAGS_prepend = "-DCONFIG_ASUS "
-- 
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