On 一, 2012-06-11 at 09:57 +0530, Amit Kachhap wrote:
> Hi Rui,
>
> Sorry for sending one incomplete mail before.
> I like this approach of multiple cooling states for ACTIVE type cooling devices.
Great, thanks.
> Some comments added.
> On 11 June 2012 08:50, Zhang Rui <rui.zhang@xxxxxxxxx> wrote:
> >
> > Set upper and lower limits when binding
> > a thermal cooling device to a thermal zone device.
> >
> > Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> > ---
> > drivers/acpi/thermal.c | 34 ++++++++++++++++++++++++----------
> > drivers/platform/x86/acerhdf.c | 2 +-
> > drivers/thermal/thermal_sys.c | 20 ++++++++++++++------
> > include/linux/thermal.h | 3 ++-
> > 4 files changed, 41 insertions(+), 18 deletions(-)
> >
> > Index: rtd3/drivers/thermal/thermal_sys.c
> > ===================================================================
> > --- rtd3.orig/drivers/thermal/thermal_sys.c
> > +++ rtd3/drivers/thermal/thermal_sys.c
> > @@ -248,7 +248,7 @@ passive_store(struct device *dev, struct
> > sizeof("Processor")))
> > thermal_zone_bind_cooling_device(tz,
> > THERMAL_TRIPS_NONE,
> > - cdev);
> > + cdev, -1, -1);
> > }
> > mutex_unlock(&thermal_list_lock);
> > if (!tz->passive_delay)
> > @@ -760,7 +760,8 @@ static void thermal_zone_device_check(st
> > */
> > int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
> > int trip,
> > - struct thermal_cooling_device *cdev)
> > + struct thermal_cooling_device *cdev,
> > + long upper, long lower)
> > {
> > struct thermal_cooling_device_instance *dev;
> > struct thermal_cooling_device_instance *pos;
> > @@ -784,6 +785,15 @@ int thermal_zone_bind_cooling_device(str
> > if (tz != pos1 || cdev != pos2)
> > return -EINVAL;
> >
> > + cdev->ops->get_max_state(cdev, &max_state);
> > +
> > + /* lower default 0, upper default max_state */
> > + lower = lower < 0 ? 0 : lower;
> > + upper = upper < 0 ? max_state : upper;
> > +
> > + if (lower > upper || upper > max_state)
> > + return -EINVAL;
> > +
> > dev =
> > kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
> > if (!dev)
> > @@ -791,10 +801,8 @@ int thermal_zone_bind_cooling_device(str
> > dev->tz = tz;
> > dev->cdev = cdev;
> > dev->trip = trip;
> > -
> > - cdev->ops->get_max_state(dev, &max_state);
> > - dev->upper = max_state;
> > - dev->lower = 0;
> > + dev->upper = upper;
> > + dev->lower = lower;
> Also some check can be added here like this,
> cdev->ops->get_max_state(cdev, &cur_state);
you mean set_cur_state?
> if (cur_state != lower) {
> print_err("Set the initial state of the cooling device
> to lower\n");
> return -EINVAL;
> }
> This is needed because in your thermal_zone_update
> implementation the state change is from lower - upper.
No. we should not set it.
Say, you are binding a fan to a active trip point 50, and the current
temperature is 30.
And further more, if you read all the patch set, you can see that every
binding is actually invalid from the beginning.
So the upper and lower limits are just indicators here, it makes real
sense only if this binding is activated.
thanks,
rui
> >
> > result = get_idr(&tz->idr, &tz->lock, &dev->id);
> > if (result)
> > Index: rtd3/include/linux/thermal.h
> > ===================================================================
> > --- rtd3.orig/include/linux/thermal.h
> > +++ rtd3/include/linux/thermal.h
> > @@ -143,7 +143,8 @@ struct thermal_zone_device *thermal_zone
> > void thermal_zone_device_unregister(struct thermal_zone_device *);
> >
> > int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
> > - struct thermal_cooling_device *);
> > + struct thermal_cooling_device *,
> > + long, long);
> > int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
> > struct thermal_cooling_device *);
> > void thermal_zone_device_update(struct thermal_zone_device *);
> > Index: rtd3/drivers/acpi/thermal.c
> > ===================================================================
> > --- rtd3.orig/drivers/acpi/thermal.c
> > +++ rtd3/drivers/acpi/thermal.c
> > @@ -729,11 +729,9 @@ static int thermal_notify(struct thermal
> > return 0;
> > }
> >
> > -typedef int (*cb)(struct thermal_zone_device *, int,
> > - struct thermal_cooling_device *);
> > static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
> > struct thermal_cooling_device *cdev,
> > - cb action)
> > + int bind)
> > {
> > struct acpi_device *device = cdev->devdata;
> > struct acpi_thermal *tz = thermal->devdata;
> > @@ -758,7 +756,14 @@ static int acpi_thermal_cooling_device_c
> > handle = tz->trips.passive.devices.handles[i];
> > status = acpi_bus_get_device(handle, &dev);
> > if (ACPI_SUCCESS(status) && (dev == device)) {
> > - result = action(thermal, trip, cdev);
> > + if (bind)
> > + result =
> > + thermal_zone_bind_cooling_device(
> > + thermal, trip, cdev, -1, -1);
> > + else
> > + result =
> > + thermal_zone_unbind_cooling_device(
> > + thermal, trip, cdev);
> > if (result)
> > goto failed;
> > }
> > @@ -775,7 +780,13 @@ static int acpi_thermal_cooling_device_c
> > handle = tz->trips.active[i].devices.handles[j];
> > status = acpi_bus_get_device(handle, &dev);
> > if (ACPI_SUCCESS(status) && (dev == device)) {
> > - result = action(thermal, trip, cdev);
> > + if (bind)
> > + result =
> > + thermal_zone_bind_cooling_device(
> > + thermal, trip, cdev, -1, -1);
> > + else
> > + result = thermal_zone_unbind_cooling_device(
> > + thermal, trip, cdev);
> > if (result)
> > goto failed;
> > }
> > @@ -786,7 +797,12 @@ static int acpi_thermal_cooling_device_c
> > handle = tz->devices.handles[i];
> > status = acpi_bus_get_device(handle, &dev);
> > if (ACPI_SUCCESS(status) && (dev == device)) {
> > - result = action(thermal, -1, cdev);
> > + if (bind)
> > + result = thermal_zone_bind_cooling_device(thermal,
> > + -1, cdev, -1, -1);
> > + else
> > + result = thermal_zone_unbind_cooling_device(thermal,
> > + -1, cdev);
> > if (result)
> > goto failed;
> > }
> > @@ -800,16 +816,14 @@ static int
> > acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
> > struct thermal_cooling_device *cdev)
> > {
> > - return acpi_thermal_cooling_device_cb(thermal, cdev,
> > - thermal_zone_bind_cooling_device);
> > + return acpi_thermal_cooling_device_cb(thermal, cdev, 1);
> > }
> >
> > static int
> > acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
> > struct thermal_cooling_device *cdev)
> > {
> > - return acpi_thermal_cooling_device_cb(thermal, cdev,
> > - thermal_zone_unbind_cooling_device);
> > + return acpi_thermal_cooling_device_cb(thermal, cdev, 0);
> > }
> >
> > static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
> > Index: rtd3/drivers/platform/x86/acerhdf.c
> > ===================================================================
> > --- rtd3.orig/drivers/platform/x86/acerhdf.c
> > +++ rtd3/drivers/platform/x86/acerhdf.c
> > @@ -329,7 +329,7 @@ static int acerhdf_bind(struct thermal_z
> > if (cdev != cl_dev)
> > return 0;
> >
> > - if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
> > + if (thermal_zone_bind_cooling_device(thermal, 0, cdev, -1, -1)) {
> > pr_err("error binding cooling dev\n");
> > return -EINVAL;
> > }
> >
> >
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