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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: Loic Poulain <loic.poulain@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Loic Poulain
Marcel Holtmann
parent
aa6802df09
commit
74cdad37cd
@ -32,6 +32,7 @@
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#include <linux/gpio/consumer.h>
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#include <linux/acpi.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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@ -58,6 +59,8 @@
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#define LPM_OP_SUSPEND_ACK 0x02
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#define LPM_OP_RESUME_ACK 0x03
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#define LPM_SUSPEND_DELAY_MS 1000
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struct hci_lpm_pkt {
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__u8 opcode;
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__u8 dlen;
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@ -79,6 +82,8 @@ static DEFINE_MUTEX(intel_device_list_lock);
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struct intel_data {
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struct sk_buff *rx_skb;
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struct sk_buff_head txq;
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struct work_struct busy_work;
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struct hci_uart *hu;
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unsigned long flags;
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};
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@ -284,6 +289,11 @@ static irqreturn_t intel_irq(int irq, void *dev_id)
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intel_lpm_host_wake(idev->hu);
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mutex_unlock(&idev->hu_lock);
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/* Host/Controller are now LPM resumed, trigger a new delayed suspend */
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pm_runtime_get(&idev->pdev->dev);
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pm_runtime_mark_last_busy(&idev->pdev->dev);
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pm_runtime_put_autosuspend(&idev->pdev->dev);
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return IRQ_HANDLED;
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}
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@ -339,9 +349,17 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
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}
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device_wakeup_enable(&idev->pdev->dev);
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pm_runtime_set_active(&idev->pdev->dev);
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pm_runtime_use_autosuspend(&idev->pdev->dev);
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pm_runtime_set_autosuspend_delay(&idev->pdev->dev,
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LPM_SUSPEND_DELAY_MS);
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pm_runtime_enable(&idev->pdev->dev);
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} else if (!powered && device_may_wakeup(&idev->pdev->dev)) {
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devm_free_irq(&idev->pdev->dev, idev->irq, idev);
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device_wakeup_disable(&idev->pdev->dev);
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pm_runtime_disable(&idev->pdev->dev);
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}
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}
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@ -350,6 +368,28 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
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return err;
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}
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static void intel_busy_work(struct work_struct *work)
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{
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struct list_head *p;
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struct intel_data *intel = container_of(work, struct intel_data,
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busy_work);
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/* Link is busy, delay the suspend */
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mutex_lock(&intel_device_list_lock);
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list_for_each(p, &intel_device_list) {
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struct intel_device *idev = list_entry(p, struct intel_device,
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list);
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if (intel->hu->tty->dev->parent == idev->pdev->dev.parent) {
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pm_runtime_get(&idev->pdev->dev);
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pm_runtime_mark_last_busy(&idev->pdev->dev);
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pm_runtime_put_autosuspend(&idev->pdev->dev);
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break;
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}
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}
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mutex_unlock(&intel_device_list_lock);
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}
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static int intel_open(struct hci_uart *hu)
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{
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struct intel_data *intel;
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@ -361,6 +401,9 @@ static int intel_open(struct hci_uart *hu)
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return -ENOMEM;
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skb_queue_head_init(&intel->txq);
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INIT_WORK(&intel->busy_work, intel_busy_work);
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intel->hu = hu;
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hu->priv = intel;
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@ -376,6 +419,8 @@ static int intel_close(struct hci_uart *hu)
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BT_DBG("hu %p", hu);
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cancel_work_sync(&intel->busy_work);
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intel_set_power(hu, false);
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skb_queue_purge(&intel->txq);
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@ -949,10 +994,12 @@ static void intel_recv_lpm_notify(struct hci_dev *hdev, int value)
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bt_dev_dbg(hdev, "TX idle notification (%d)", value);
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if (value)
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if (value) {
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set_bit(STATE_TX_ACTIVE, &intel->flags);
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else
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schedule_work(&intel->busy_work);
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} else {
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clear_bit(STATE_TX_ACTIVE, &intel->flags);
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}
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}
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static int intel_recv_lpm(struct hci_dev *hdev, struct sk_buff *skb)
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@ -1027,9 +1074,27 @@ static int intel_recv(struct hci_uart *hu, const void *data, int count)
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static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
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{
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struct intel_data *intel = hu->priv;
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struct list_head *p;
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BT_DBG("hu %p skb %p", hu, skb);
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/* Be sure our controller is resumed and potential LPM transaction
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* completed before enqueuing any packet.
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*/
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mutex_lock(&intel_device_list_lock);
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list_for_each(p, &intel_device_list) {
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struct intel_device *idev = list_entry(p, struct intel_device,
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list);
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if (hu->tty->dev->parent == idev->pdev->dev.parent) {
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pm_runtime_get_sync(&idev->pdev->dev);
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pm_runtime_mark_last_busy(&idev->pdev->dev);
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pm_runtime_put_autosuspend(&idev->pdev->dev);
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break;
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}
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}
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mutex_unlock(&intel_device_list_lock);
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skb_queue_tail(&intel->txq, skb);
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return 0;
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@ -1103,7 +1168,7 @@ static int intel_acpi_probe(struct intel_device *idev)
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}
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#endif
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#ifdef CONFIG_PM_SLEEP
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#ifdef CONFIG_PM
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static int intel_suspend(struct device *dev)
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{
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struct intel_device *idev = dev_get_drvdata(dev);
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@ -1135,6 +1200,7 @@ static int intel_resume(struct device *dev)
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static const struct dev_pm_ops intel_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
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SET_RUNTIME_PM_OPS(intel_suspend, intel_resume, NULL)
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};
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static int intel_probe(struct platform_device *pdev)
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