diff options
| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-11-29 13:50:33 +0100 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-11-29 13:55:06 +0100 |
| commit | ba06a68c582936e77396a4451ef4e5ec65211fcd (patch) | |
| tree | cc0028cdff576de3a53bb9f9cbad270f3f682088 | |
| parent | 13bd0f089ac6babeb7248fe3db4b9c19233cce3c (diff) | |
apalis/colibri_t20/t30: avoid spurious over-temperature shutdown
To avoid spurious shutdowns on over-temperature make sure we read the
temperature 3 times in a row.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Dominik Sliwa <dominik.sliwa@toradex.com>
| -rw-r--r-- | arch/arm/mach-tegra/board-colibri_t20.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/arm/mach-tegra/board-colibri_t20.c b/arch/arm/mach-tegra/board-colibri_t20.c index cd5b3e3c757f..a860e3b60da4 100644 --- a/arch/arm/mach-tegra/board-colibri_t20.c +++ b/arch/arm/mach-tegra/board-colibri_t20.c @@ -1168,6 +1168,7 @@ static void __init colibri_t20_register_spidev(void) static int colibri_t20_shutdown_temp = 115000; static int colibri_t20_throttle_hysteresis = 3000; static int colibri_t20_throttle_temp = 90000; +static int over_temperature_trip_counter = 0; static struct device *lm95245_device = NULL; static int thermd_alert_irq_disabled = 0; struct work_struct thermd_alert_work; @@ -1194,9 +1195,18 @@ static void thermd_alert_work_func(struct work_struct *work) if (temp > colibri_t20_shutdown_temp) { /* First check for hardware over-temperature condition mandating immediate shutdown */ - pr_err("over-temperature condition %d degC reached, initiating " - "immediate shutdown", temp); - kernel_power_off(); + + /* To avoid spurious shutdowns make sure we get it 3 times in a row */ + if (over_temperature_trip_counter >= 2) { + pr_err("over-temperature condition %d millidegC reached, initiating " + "immediate shutdown", temp); + kernel_power_off(); + } else { + over_temperature_trip_counter++; + /* Just re-schedule again */ + msleep(100); + queue_work(thermd_alert_workqueue, &thermd_alert_work); + } } else if (temp < colibri_t20_throttle_temp - colibri_t20_throttle_hysteresis) { /* Make sure throttling gets disabled again */ @@ -1229,6 +1239,10 @@ static void thermd_alert_work_func(struct work_struct *work) thermd_alert_irq_disabled = 0; enable_irq(gpio_to_irq(THERMD_ALERT)); } + + /* Reset over-temperature trip counter */ + if (over_temperature_trip_counter && temp <= colibri_t20_shutdown_temp) + over_temperature_trip_counter = 0; } static void colibri_t20_thermd_alert_init(void) |