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From ff2e0f074f61fded30a44e13b849fe9010ab4148 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Fri, 25 Jul 2008 23:06:16 +0100
Subject: [PATCH] introduce-panic-blink-led-not-using-userspace-omfg.patch
A panic is silent on GTA02, it would be good if we got a little hint
if we are crashing (eg, in suspend / resume) from a panic instead of
a deadlock, etc. On a normal PC i8042 blinks the keyboard lights if
we panic, this patch causes AUX to flash at 5Hz in event of a panic.
Tested by giving kernel fake root= that didn't exist.
Signed-off-by: Andy Green <andy@openmoko.com>
---
arch/arm/mach-s3c2440/mach-gta02.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index fd746fd..c32bb2a 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -328,6 +328,27 @@ FIQ_HANDLER_ENTRY(256, 512)
FIQ_HANDLER_END()
+/*
+ * this gets called every 1ms when we paniced.
+ */
+
+static long gta02_panic_blink(long count)
+{
+ long delay = 0;
+ static long last_blink;
+ static char led;
+
+ if (count - last_blink < 100) /* 200ms period, fast blink */
+ return 0;
+
+ led ^= 1;
+ s3c2410_gpio_cfgpin(GTA02_GPIO_AUX_LED, S3C2410_GPIO_OUTPUT);
+ neo1973_gpb_setpin(GTA02_GPIO_AUX_LED, led);
+
+ last_blink = count;
+ return delay;
+}
+
/**
* returns PCB revision information in b9,b8 and b2,b1,b0
@@ -1476,6 +1497,9 @@ static void __init gta02_machine_init(void)
{
int rc;
+ /* set the panic callback to make AUX blink fast */
+ panic_blink = gta02_panic_blink;
+
switch (system_rev) {
case GTA02v6_SYSTEM_REV:
/* we need push-pull interrupt from motion sensors */
--
1.5.6.3
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