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Commit 71d821fd authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / QoS: Add type to dev_pm_qos_add_ancestor_request() arguments 



Rework dev_pm_qos_add_ancestor_request() so that device PM QoS type
is passed to it as the third argument and make it support the
DEV_PM_QOS_LATENCY_TOLERANCE device PM QoS type (in addition to
DEV_PM_QOS_RESUME_LATENCY).

That will allow the drivers of devices without latency tolerance
hardware support to use their ancestors having it as proxies for
their latency tolerance requirements.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 1a8f8351

Documentation/power/pm_qos_interface.txt

+4 −2
Original line number Diff line number Diff line
@@ -134,9 +134,11 @@ The meaning of the return values is as follows: 
	PM_QOS_FLAGS_UNDEFINED: The device's PM QoS structure has not been

			initialized or the list of requests is empty.



int dev_pm_qos_add_ancestor_request(dev, handle, value)

int dev_pm_qos_add_ancestor_request(dev, handle, type, value)

Add a PM QoS request for the first direct ancestor of the given device whose

power.ignore_children flag is unset.

power.ignore_children flag is unset (for DEV_PM_QOS_RESUME_LATENCY requests)

or whose power.set_latency_tolerance callback pointer is not NULL (for

DEV_PM_QOS_LATENCY_TOLERANCE requests).



int dev_pm_qos_expose_latency_limit(device, value)

Add a request to the device's PM QoS list of resume latency constraints and

drivers/base/power/qos.c

+17 −5
Original line number Diff line number Diff line
@@ -565,20 +565,32 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_remove_global_notifier); 
 * dev_pm_qos_add_ancestor_request - Add PM QoS request for device's ancestor.

 * @dev: Device whose ancestor to add the request for.

 * @req: Pointer to the preallocated handle.

 * @type: Type of the request.

 * @value: Constraint latency value.

 */

int dev_pm_qos_add_ancestor_request(struct device *dev,

				    struct dev_pm_qos_request *req, s32 value)

				    struct dev_pm_qos_request *req,

				    enum dev_pm_qos_req_type type, s32 value)

{

	struct device *ancestor = dev->parent;

	int ret = -ENODEV;



	switch (type) {

	case DEV_PM_QOS_RESUME_LATENCY:

		while (ancestor && !ancestor->power.ignore_children)

			ancestor = ancestor->parent;



		break;

	case DEV_PM_QOS_LATENCY_TOLERANCE:

		while (ancestor && !ancestor->power.set_latency_tolerance)

			ancestor = ancestor->parent;



		break;

	default:

		ancestor = NULL;

	}

	if (ancestor)

		ret = dev_pm_qos_add_request(ancestor, req,

					     DEV_PM_QOS_RESUME_LATENCY, value);

		ret = dev_pm_qos_add_request(ancestor, req, type, value);



	if (ret < 0)

		req->dev = NULL;

drivers/input/touchscreen/st1232.c

+2 −1
Original line number Diff line number Diff line
@@ -134,7 +134,8 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) 
	} else if (!ts->low_latency_req.dev) {

		/* First contact, request 100 us latency. */

		dev_pm_qos_add_ancestor_request(&ts->client->dev,

						&ts->low_latency_req, 100);

						&ts->low_latency_req,

						DEV_PM_QOS_RESUME_LATENCY, 100);

	}



	/* SYN_REPORT */

include/linux/pm_qos.h

+5 −2
Original line number Diff line number Diff line
@@ -149,7 +149,8 @@ int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier); 
void dev_pm_qos_constraints_init(struct device *dev);

void dev_pm_qos_constraints_destroy(struct device *dev);

int dev_pm_qos_add_ancestor_request(struct device *dev,

				    struct dev_pm_qos_request *req, s32 value);

				    struct dev_pm_qos_request *req,

				    enum dev_pm_qos_req_type type, s32 value);

#else

static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,

							  s32 mask)
@@ -192,7 +193,9 @@ static inline void dev_pm_qos_constraints_destroy(struct device *dev) 
	dev->power.power_state = PMSG_INVALID;

}

static inline int dev_pm_qos_add_ancestor_request(struct device *dev,

				    struct dev_pm_qos_request *req, s32 value)

						  struct dev_pm_qos_request *req,

						  enum dev_pm_qos_req_type type,

						  s32 value)

			{ return 0; }

#endif