[PATCH v2 3/3] Bluetooth: hci_h5: Add runtime suspend

From: Archie Pusaka
Date: Thu Jul 15 2021 - 10:52:20 EST


From: Archie Pusaka <apusaka@xxxxxxxxxxxx>

This patch allows the controller to suspend after a short period of
inactivity.

Signed-off-by: Archie Pusaka <apusaka@xxxxxxxxxxxx>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@xxxxxxxxxxxx>
Reviewed-by: Hilda Wu <hildawu@xxxxxxxxxxx>

---

(no changes since v1)

drivers/bluetooth/hci_h5.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index cbc63b057f33..f95ec9991180 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -11,6 +11,7 @@
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
+#include <linux/pm_runtime.h>
#include <linux/of_device.h>
#include <linux/serdev.h>
#include <linux/skbuff.h>
@@ -21,6 +22,8 @@
#include "btrtl.h"
#include "hci_uart.h"

+#define SUSPEND_TIMEOUT_MS 6000
+
#define HCI_3WIRE_ACK_PKT 0
#define HCI_3WIRE_LINK_PKT 15

@@ -584,6 +587,10 @@ static int h5_recv(struct hci_uart *hu, const void *data, int count)
count -= processed;
}

+ pm_runtime_get(&hu->serdev->dev);
+ pm_runtime_mark_last_busy(&hu->serdev->dev);
+ pm_runtime_put_autosuspend(&hu->serdev->dev);
+
return 0;
}

@@ -620,6 +627,10 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
break;
}

+ pm_runtime_get_sync(&hu->serdev->dev);
+ pm_runtime_mark_last_busy(&hu->serdev->dev);
+ pm_runtime_put_autosuspend(&hu->serdev->dev);
+
return 0;
}

@@ -951,6 +962,12 @@ static void h5_btrtl_open(struct h5 *h5)
serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN);
serdev_device_set_baudrate(h5->hu->serdev, 115200);

+ pm_runtime_set_active(&h5->hu->serdev->dev);
+ pm_runtime_use_autosuspend(&h5->hu->serdev->dev);
+ pm_runtime_set_autosuspend_delay(&h5->hu->serdev->dev,
+ SUSPEND_TIMEOUT_MS);
+ pm_runtime_enable(&h5->hu->serdev->dev);
+
/* The controller needs up to 500ms to wakeup */
gpiod_set_value_cansleep(h5->enable_gpio, 1);
gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
@@ -959,6 +976,8 @@ static void h5_btrtl_open(struct h5 *h5)

static void h5_btrtl_close(struct h5 *h5)
{
+ pm_runtime_disable(&h5->hu->serdev->dev);
+
gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
gpiod_set_value_cansleep(h5->enable_gpio, 0);
}
@@ -1066,6 +1085,7 @@ MODULE_DEVICE_TABLE(acpi, h5_acpi_match);

static const struct dev_pm_ops h5_serdev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(h5_serdev_suspend, h5_serdev_resume)
+ SET_RUNTIME_PM_OPS(h5_serdev_suspend, h5_serdev_resume, NULL)
};

static const struct of_device_id rtl_bluetooth_of_match[] = {
--
2.32.0.93.g670b81a890-goog