Commit 74cdad37 authored by Loic Poulain's avatar Loic Poulain Committed by Marcel Holtmann

Bluetooth: hci_intel: Add runtime PM support

Implement runtime PM suspend/resume callbacks.
If LPM supported, controller is put into supsend after a delay of
inactivity (1s). Inactivity is based on LPM idle notification and
host TX traffic.
Signed-off-by: default avatarLoic Poulain <loic.poulain@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent aa6802df
......@@ -32,6 +32,7 @@
#include <linux/gpio/consumer.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
......@@ -58,6 +59,8 @@
#define LPM_OP_SUSPEND_ACK 0x02
#define LPM_OP_RESUME_ACK 0x03
#define LPM_SUSPEND_DELAY_MS 1000
struct hci_lpm_pkt {
__u8 opcode;
__u8 dlen;
......@@ -79,6 +82,8 @@ static DEFINE_MUTEX(intel_device_list_lock);
struct intel_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct work_struct busy_work;
struct hci_uart *hu;
unsigned long flags;
};
......@@ -284,6 +289,11 @@ static irqreturn_t intel_irq(int irq, void *dev_id)
intel_lpm_host_wake(idev->hu);
mutex_unlock(&idev->hu_lock);
/* Host/Controller are now LPM resumed, trigger a new delayed suspend */
pm_runtime_get(&idev->pdev->dev);
pm_runtime_mark_last_busy(&idev->pdev->dev);
pm_runtime_put_autosuspend(&idev->pdev->dev);
return IRQ_HANDLED;
}
......@@ -339,9 +349,17 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
}
device_wakeup_enable(&idev->pdev->dev);
pm_runtime_set_active(&idev->pdev->dev);
pm_runtime_use_autosuspend(&idev->pdev->dev);
pm_runtime_set_autosuspend_delay(&idev->pdev->dev,
LPM_SUSPEND_DELAY_MS);
pm_runtime_enable(&idev->pdev->dev);
} else if (!powered && device_may_wakeup(&idev->pdev->dev)) {
devm_free_irq(&idev->pdev->dev, idev->irq, idev);
device_wakeup_disable(&idev->pdev->dev);
pm_runtime_disable(&idev->pdev->dev);
}
}
......@@ -350,6 +368,28 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
return err;
}
static void intel_busy_work(struct work_struct *work)
{
struct list_head *p;
struct intel_data *intel = container_of(work, struct intel_data,
busy_work);
/* Link is busy, delay the suspend */
mutex_lock(&intel_device_list_lock);
list_for_each(p, &intel_device_list) {
struct intel_device *idev = list_entry(p, struct intel_device,
list);
if (intel->hu->tty->dev->parent == idev->pdev->dev.parent) {
pm_runtime_get(&idev->pdev->dev);
pm_runtime_mark_last_busy(&idev->pdev->dev);
pm_runtime_put_autosuspend(&idev->pdev->dev);
break;
}
}
mutex_unlock(&intel_device_list_lock);
}
static int intel_open(struct hci_uart *hu)
{
struct intel_data *intel;
......@@ -361,6 +401,9 @@ static int intel_open(struct hci_uart *hu)
return -ENOMEM;
skb_queue_head_init(&intel->txq);
INIT_WORK(&intel->busy_work, intel_busy_work);
intel->hu = hu;
hu->priv = intel;
......@@ -376,6 +419,8 @@ static int intel_close(struct hci_uart *hu)
BT_DBG("hu %p", hu);
cancel_work_sync(&intel->busy_work);
intel_set_power(hu, false);
skb_queue_purge(&intel->txq);
......@@ -949,10 +994,12 @@ static void intel_recv_lpm_notify(struct hci_dev *hdev, int value)
bt_dev_dbg(hdev, "TX idle notification (%d)", value);
if (value)
if (value) {
set_bit(STATE_TX_ACTIVE, &intel->flags);
else
schedule_work(&intel->busy_work);
} else {
clear_bit(STATE_TX_ACTIVE, &intel->flags);
}
}
static int intel_recv_lpm(struct hci_dev *hdev, struct sk_buff *skb)
......@@ -1027,9 +1074,27 @@ static int intel_recv(struct hci_uart *hu, const void *data, int count)
static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct intel_data *intel = hu->priv;
struct list_head *p;
BT_DBG("hu %p skb %p", hu, skb);
/* Be sure our controller is resumed and potential LPM transaction
* completed before enqueuing any packet.
*/
mutex_lock(&intel_device_list_lock);
list_for_each(p, &intel_device_list) {
struct intel_device *idev = list_entry(p, struct intel_device,
list);
if (hu->tty->dev->parent == idev->pdev->dev.parent) {
pm_runtime_get_sync(&idev->pdev->dev);
pm_runtime_mark_last_busy(&idev->pdev->dev);
pm_runtime_put_autosuspend(&idev->pdev->dev);
break;
}
}
mutex_unlock(&intel_device_list_lock);
skb_queue_tail(&intel->txq, skb);
return 0;
......@@ -1103,7 +1168,7 @@ static int intel_acpi_probe(struct intel_device *idev)
}
#endif
#ifdef CONFIG_PM_SLEEP
#ifdef CONFIG_PM
static int intel_suspend(struct device *dev)
{
struct intel_device *idev = dev_get_drvdata(dev);
......@@ -1135,6 +1200,7 @@ static int intel_resume(struct device *dev)
static const struct dev_pm_ops intel_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
SET_RUNTIME_PM_OPS(intel_suspend, intel_resume, NULL)
};
static int intel_probe(struct platform_device *pdev)
......
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