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Bluetooth: hci_bcm: Add suspend/resume runtime PM functions 

Adds autosuspend runtime functionality to BCM UART driver.
Autosuspend is enabled at end of bcm_setup.

bcm_device_lock is used for system sleep functions as they can be
called at any time.
bcm_device_lock is not held for runtime suspend functions as this
is only enabled as long as platform device is opened.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Frederic Danis 2015-09-23 18:18:11 +02:00 committed by Marcel Holtmann
parent 7649faff1c
commit e88ab30d36
1 changed files with 56 additions and 4 deletions
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60
drivers/bluetooth/hci_bcm.c
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@ -33,6 +33,7 @@
#include <linux/tty.h>
#include <linux/interrupt.h>
#include <linux/dmi.h>
#include <linux/pm_runtime.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
@ -40,6 +41,8 @@
#include "btbcm.h"
#include "hci_uart.h"
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
struct bcm_device {
struct list_head list;
@ -160,6 +163,10 @@ static irqreturn_t bcm_host_wake(int irq, void *data)
bt_dev_dbg(bdev, "Host wake IRQ");
pm_runtime_get(&bdev->pdev->dev);
pm_runtime_mark_last_busy(&bdev->pdev->dev);
pm_runtime_put_autosuspend(&bdev->pdev->dev);
return IRQ_HANDLED;
}
@ -183,6 +190,12 @@ static int bcm_request_irq(struct bcm_data *bcm)
goto unlock;
device_init_wakeup(&bdev->pdev->dev, true);
pm_runtime_set_autosuspend_delay(&bdev->pdev->dev,
BCM_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(&bdev->pdev->dev);
pm_runtime_set_active(&bdev->pdev->dev);
pm_runtime_enable(&bdev->pdev->dev);
}
unlock:
@ -198,7 +211,7 @@ static const struct bcm_set_sleep_mode default_sleep_params = {
.bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
.host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
.allow_host_sleep = 1, /* Allow host sleep in SCO flag */
.combine_modes = 0, /* Combine sleep and LPM flag */
.combine_modes = 1, /* Combine sleep and LPM flag */
.tristate_control = 0, /* Allow tri-state control of UART tx flag */
/* Irrelevant USB flags */
.usb_auto_sleep = 0,
@ -284,6 +297,9 @@ static int bcm_close(struct hci_uart *hu)
if (bcm_device_exists(bdev)) {
bcm_gpio_set_power(bdev, false);
#ifdef CONFIG_PM
pm_runtime_disable(&bdev->pdev->dev);
pm_runtime_set_suspended(&bdev->pdev->dev);
if (device_can_wakeup(&bdev->pdev->dev)) {
devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
device_init_wakeup(&bdev->pdev->dev, false);
@ -400,6 +416,15 @@ static int bcm_recv(struct hci_uart *hu, const void *data, int count)
bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
bcm->rx_skb = NULL;
return err;
} else if (!bcm->rx_skb) {
/* Delay auto-suspend when receiving completed packet */
mutex_lock(&bcm_device_lock);
if (bcm->dev && bcm_device_exists(bcm->dev)) {
pm_runtime_get(&bcm->dev->pdev->dev);
pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
}
mutex_unlock(&bcm_device_lock);
}
return count;
@ -421,8 +446,27 @@ static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
struct sk_buff *skb = NULL;
struct bcm_device *bdev = NULL;
return skb_dequeue(&bcm->txq);
mutex_lock(&bcm_device_lock);
if (bcm_device_exists(bcm->dev)) {
bdev = bcm->dev;
pm_runtime_get_sync(&bdev->pdev->dev);
/* Shall be resumed here */
}
skb = skb_dequeue(&bcm->txq);
if (bdev) {
pm_runtime_mark_last_busy(&bdev->pdev->dev);
pm_runtime_put_autosuspend(&bdev->pdev->dev);
}
mutex_unlock(&bcm_device_lock);
return skb;
}
#ifdef CONFIG_PM
@ -490,7 +534,8 @@ static int bcm_suspend(struct device *dev)
if (!bdev->hu)
goto unlock;
bcm_suspend_device(dev);
if (pm_runtime_active(dev))
bcm_suspend_device(dev);
if (device_may_wakeup(&bdev->pdev->dev)) {
error = enable_irq_wake(bdev->irq);
@ -530,6 +575,10 @@ static int bcm_resume(struct device *dev)
unlock:
mutex_unlock(&bcm_device_lock);
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
#endif
@ -750,7 +799,10 @@ MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif
/* Platform suspend and resume callbacks */
static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);
static const struct dev_pm_ops bcm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
};
static struct platform_driver bcm_driver = {
.probe = bcm_probe,