On 10/22/2012 02:02 PM, Hongbo Zhang wrote: [...]
+static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data) +{
struct db8500_thermal_zone *pzone = irq_data;struct db8500_thsens_platform_data *ptrips;unsigned long next_low, next_high;unsigned int idx;ptrips = pzone->trip_tab;idx = pzone->cur_index;if (unlikely(idx == 0))/* Meaningless for thermal management, ignoring it */return IRQ_HANDLED;if (idx == 1) {next_high = ptrips->trip_points[0].temp;next_low = PRCMU_DEFAULT_LOW_TEMP;} else {next_high = ptrips->trip_points[idx-1].temp;next_low = ptrips->trip_points[idx-2].temp;}pzone->cur_index -= 1;pzone->cur_temp_pseudo = (next_high + next_low)/2;prcmu_stop_temp_sense();prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);pr_debug("PRCMU set max %ld, set min %ld\n", next_high, next_low);pzone->trend = THERMAL_TREND_DROPPING;schedule_work(&pzone->therm_work);return IRQ_HANDLED;+}
+static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data) +{
struct db8500_thermal_zone *pzone = irq_data;struct db8500_thsens_platform_data *ptrips;unsigned long next_low, next_high;unsigned int idx;ptrips = pzone->trip_tab;idx = pzone->cur_index;if (idx < ptrips->num_trips - 1) {next_high = ptrips->trip_points[idx+1].temp;next_low = ptrips->trip_points[idx].temp;pzone->cur_index += 1;pzone->cur_temp_pseudo = (next_high + next_low)/2;prcmu_stop_temp_sense();prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);pr_debug("PRCMU set max %ld, min %ld\n", next_high, next_low);}if (idx == ptrips->num_trips - 1)} else if ()
There is no else condition here, because it it the highest critical trip point, system will be shut down in thermal_work. But I'd like to add some comments here to state this situation.
I didn't mean adding a new else condition, what I meant is that if the first condition (idx < ptrips->num_trips - 1) is verified, then there is no need to check for the second condition (idx == ptrips->num_trips - 1). So I was thinking of changing the code to:
if (idx < ptrips->num_trips - 1) ... else if (idx == ptrips->num_trips - 1) ...
Sorry if I wasn't clear.
pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;pzone->trend = THERMAL_TREND_RAISING;schedule_work(&pzone->therm_work);return IRQ_HANDLED;+}
+static void db8500_thermal_work(struct work_struct *work) +{
enum thermal_device_mode cur_mode;struct db8500_thermal_zone *pzone;pzone = container_of(work, struct db8500_thermal_zone, therm_work);mutex_lock(&pzone->th_lock);cur_mode = pzone->mode;mutex_unlock(&pzone->th_lock);if (cur_mode == THERMAL_DEVICE_DISABLED) {pr_warn("Warning: thermal function disabled.\n");return;}thermal_zone_device_update(pzone->therm_dev);pr_debug("db8500_thermal_work finished.\n");+}
+static int __devinit db8500_thermal_probe(struct platform_device *pdev) +{
struct db8500_thermal_zone *pzone = NULL;struct db8500_thsens_platform_data *ptrips;int low_irq, high_irq, ret = 0;unsigned long dft_low, dft_high;pzone = devm_kzalloc(&pdev->dev,sizeof(struct db8500_thermal_zone), GFP_KERNEL);if (!pzone)return -ENOMEM;pzone->thsens_pdev = pdev;low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");if (low_irq < 0) {pr_err("Get IRQ_HOTMON_LOW failed.\n");return low_irq;}ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,prcmu_low_irq_handler,IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_low", pzone);if (ret < 0) {pr_err("Failed to allocate temp low irq.\n");return ret;}high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");if (high_irq < 0) {pr_err("Get IRQ_HOTMON_HIGH failed.\n");return high_irq;}ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,prcmu_high_irq_handler,IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_high", pzone);if (ret < 0) {pr_err("Failed to allocate temp high irq.\n");return ret;}pzone->low_irq = low_irq;pzone->high_irq = high_irq;pzone->mode = THERMAL_DEVICE_DISABLED;mutex_init(&pzone->th_lock);INIT_WORK(&pzone->therm_work, db8500_thermal_work);ptrips = pdev->dev.platform_data;pzone->trip_tab = ptrips;pzone->therm_dev = thermal_zone_device_register("db8500_thermal_zone",ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0);if (IS_ERR(pzone->therm_dev)) {pr_err("Failed to register thermal zone device\n");return PTR_ERR(pzone->therm_dev);}dft_low = PRCMU_DEFAULT_LOW_TEMP;dft_high = ptrips->trip_points[0].temp;prcmu_stop_temp_sense();prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);pzone->cur_index = 0;pzone->cur_temp_pseudo = (dft_low + dft_high)/2;pzone->trend = THERMAL_TREND_STABLE;All the stuff from prcmu_stop_temp_sense() up to this line can race with the irq handlers, I would suggest doing it before requesting the irqs.
pzone->mode = THERMAL_DEVICE_ENABLED;Shouldn't this be protected by pzone->th_lock? Otherwise it should be set before the thermal zone is registered.
platform_set_drvdata(pdev, pzone);return 0;+}
+static int __devexit db8500_thermal_remove(struct platform_device *pdev) +{
struct db8500_thermal_zone *pzone;pzone = platform_get_drvdata(pdev);cancel_work_sync(&pzone->therm_work);if (pzone->therm_dev)thermal_zone_device_unregister(pzone->therm_dev);return 0;+}
mutex_destroy() should be called on pzone->th_lock
+static int db8500_thermal_suspend(struct platform_device *pdev,
pm_message_t state)+{
struct db8500_thermal_zone *pzone;pzone = platform_get_drvdata(pdev);flush_work_sync(&pzone->therm_work);prcmu_stop_temp_sense();return 0;+}
+static int db8500_thermal_resume(struct platform_device *pdev) +{
struct db8500_thermal_zone *pzone;struct db8500_thsens_platform_data *ptrips;unsigned long dft_low, dft_high;pzone = platform_get_drvdata(pdev);ptrips = pzone->trip_tab;dft_low = PRCMU_DEFAULT_LOW_TEMP;dft_high = ptrips->trip_points[0].temp;prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);Shouldn't cur_index and cur_temp_pseudo be updated as well? You may want to define a helper function with all the code shared by irq handlers (both high and low), probe and resume.
No, they cannot be update because we don't know the actual current temp[1] after short or long time suspend, everything goes as beginning.
That's what I wanted to say, if everything is reset to a default value, then cur_index and cur_temp should be reset too, as it's done in the probe function. Otherwise you may have a current pseudo-temp and a current index unrelated to how the hotmon is configured.
If a helper function is introduced, it can be only used in probe and resume I think, different and a bit complicated algorithm in irq handlers.
I was thinking about a function which takes the new index and the new low and high parameters, and updates cur_index and cur_pseudo_temp and does the prcmu stuff. It seems to me this is (or should be) common to all the 4 functions.
[1] due to lack of corresponding interface, search "TODO" in this file to get more explanation.
-- Francesco