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 <[EMAIL PROTECTED]>
---
arch/arm/mach-s3c2440/mach-gta02.c | 30 +++++++++++++++++++++++++++---
1 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c
b/arch/arm/mach-s3c2440/mach-gta02.c
index 2c44bc1..27917da 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -331,6 +331,27 @@ 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
@@ -878,9 +899,9 @@ static struct s3c2410_udc_mach_info gta02_udc_cfg = {
};
static struct s3c2410_ts_mach_info gta02_ts_cfg = {
- .delay = 10000,
- .presc = 65,
- .oversampling_shift = 5,
+ .delay = 20000,
+ .presc = 50000000 / 2500000, /* PCLK / 2.5MHz */
+ .oversampling_shift = 0, /* averaging, 2^n samples */
};
/* SPI: LCM control interface attached to Glamo3362 */
@@ -1483,6 +1504,9 @@ 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 */
